use url helpers in messages

fixes CNVS-11838

and then choose the host more intelligently to use one the user
can actually log in to

test plan
- have accounts on two shards, referred to as "account 1" and
 "account 2" from now on
- have account domains that are resolvable for the accounts,
 referred to as account1.canvas.dev and account2.canvas.dev from
 now on
- have account 2 trust account 1 by POSTing to
 account2.canvas.dev/api/v1/accounts/<account 2 id>/trust_links
 with a site admin's auth token and setting
 trust_link[managing_account_id] to account 1's global id.
 you can now use users from account 1 on account 2

- regression test notifications, especially considering
 notifications generated by account 2 that are sent to account 1
 users.
- account 1 users should have links that use account1.canvas.dev
 and have global ids for referenced objects that live on
 account 2's shard,
 e.g. account1.canvas.dev/courses/2~1/discussion_topics/2~30
- avatars should use the avatar owner's account domain
- account 2 users should have links that use account2.canvas.dev
 and have local ids,
 e.g. account2.canvas.dev/courses/1/discussion_topics/30
- following the links when the user receiving the notification is
 logged in should take the user to the linked object
- following the links when not logged in should take the user to
 a login page that they are able to log in to
- be sure to at least check:
 context file downloads links (e.g. discussion topic attachments)
 file downloads links (e.g. conversation message attachments)
 avatars links
 conversation notifications
 discussion notifications
 peer review notifications

Change-Id: Idebd247fee99a2b973d3fa6f4f2fca0e723d99a5
Reviewed-on: https://gerrit.instructure.com/31867
Tested-by: Jenkins
Reviewed-by: Matthew Wheeler <mwheeler@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Product-Review: Joel Hough <joel@instructure.com>

app/messages/_email_footer.email.erb

@@ -1,4 +1,4 @@
-<%= t "#messages.email.footer", <<-TEXT, :url => "#{HostUrl.protocol}://#{primary_host}/profile/communication"
+<%= t "#messages.email.footer", <<-TEXT, :url => communication_profile_url
 You received this email because you are participating in one or more classes using Canvas.  To change or turn off email notifications, visit:
 %{url}
 TEXT

app/messages/_layout.email.html.erb

@@ -49,7 +49,7 @@
                     <td width="375"></td>
                   <% end %>
                   <td width="50" align="center"> | </td>
-                  <td width="375" align="left"><a href="<%= "#{HostUrl.protocol}://#{primary_host}/profile/communication" %>">
+                  <td width="375" align="left"><a href="<%= communication_profile_url %>">
                     <%= t 'click_to_preferences', "Update your notification settings" %></a></td>
                 </tr>
               </table>

app/messages/account_user_notification.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.account) %>/accounts/<%= asset.account_id %>
+  <%= account_url(asset.account_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/account_user_notification.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.account) %>/accounts/<%= asset.account_id %>
+  <%= account_url(asset.account_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/account_user_registration.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.account) %>/register/<%= asset.user.communication_channel.confirmation_code %>
+  <%= registration_confirmation_url(asset.user.communication_channel.confirmation_code) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/account_user_registration.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.account) %>/register/<%= asset.user.communication_channel.confirmation_code %>
+  <%= registration_confirmation_url(asset.user.communication_channel.confirmation_code) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/added_to_conversation.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/conversations/<%= asset.conversation_id %>
+  <%= conversation_url(asset.conversation_id) %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author_short_name_with_shared_contexts(user) rescue t(:unknown_user, "Unknown User") %>

app/messages/added_to_conversation.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/conversations/<%= asset.conversation_id %>
+  <%= conversation_url(asset.conversation_id) %>
 <% end %>
 
 <% define_content :user_name do %>
@@ -16,4 +16,4 @@
   </a>
 <% end %>
 
-<p><%= t :body, "%{user_name} just added you to a conversation in Canvas.", :user_name => content(:user_name) %></p>
+<p><%= t :body, "%{user_name} just added you to a conversation in Canvas.", :user_name => content(:user_name) %></p>

app/messages/added_to_conversation.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/conversations/<%= asset.conversation_id %>
+  <%= conversation_url(asset.conversation_id) %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author_short_name_with_shared_contexts(user) rescue t(:unknown_user, "Unknown User") %>

app/messages/added_to_conversation.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/conversations/<%= asset.conversation_id %>
+  <%= conversation_url(asset.conversation_id) %>
 <% end %>
 <% define_content :user_name do %>
   <%= asset.author_short_name_with_shared_contexts(user) rescue t(:unknown_user, "Unknown User") %>

app/messages/added_to_conversation.twitter.erb

@@ -1,5 +1,5 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/conversations/<%= asset.conversation_id %>
+  <%= conversation_url(asset.conversation_id) %>
 <% end -%>
 <% define_content :user_name do -%>
 <%= asset.author_short_name_with_shared_contexts(user) rescue t(:unknown_user, "Unknown User") %>

app/messages/alert.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= polymorphic_url asset_context.course %>
+  <%= course_url asset_context.course_id %>
 <% end %>
 <% define_content :subject do %>
   <%= t('subject', 'Alert: %{user_name}', :user_name => asset_context.user.name) %>

app/messages/alert.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= polymorphic_url asset_context.course %>
+  <%= course_url asset_context.course_id %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/alert.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= polymorphic_url asset_context.course %>
+  <%= course_url asset_context.course_id %>
 <% end %>
 
 <%=

app/messages/alert.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= polymorphic_url asset_context.course %>
+  <%= course_url asset_context.course_id %>
 <% end %>
 <% define_content :subject do %>
   <%= t('subject', 'Alert: %{user_name}', :user_name => asset_context.user.name) %>

app/messages/alert.twitter.erb

@@ -1,5 +1,5 @@
 <% define_content :link do -%>
-<%= polymorphic_url asset_context.course %>
+<%= course_url asset_context.course_id %>
 <% end -%>
 <%=
   if asset_context.user_id == user.id
@@ -7,4 +7,4 @@
   else
     t('body', "An alert has been triggered for %{student}", :student => asset_context.user.name)
   end
-%>
+%>

app/messages/announcement_created_by_you.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do -%>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/announcements/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 <% define_content :subject do -%>
   <%= before_label asset.title %> <%= asset.context.name %>
@@ -7,9 +7,10 @@
 
 You created this Announcement:
 
-<%= html_to_text(asset.message, :base_url => "#{HostUrl.protocol}://#{HostUrl.context_host(asset.context)}") %>
+<%= html_to_text(asset.message, :base_url => dashboard_url) %>
 
 <% if asset.attachment %><%= before_label :file_included, "File Included" %> <%= asset.attachment.display_name %> - <%= asset.attachment.readable_size %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/files/<%= asset.attachment_id %>/download<% end %>
+  <%= polymorphic_url([asset.context, :file_download], file_id: asset.attachment) %>
+<% end %>
 
 <%= content :link %>

app/messages/announcement_created_by_you.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/announcements/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -14,14 +14,14 @@ You created this Announcement:
   </a>
 <% end %>
 
-<%= html_to_simple_html(asset.message, :base_url => "#{HostUrl.protocol}://#{HostUrl.context_host(asset.context)}") %>
+<%= html_to_text(asset.message, :base_url => dashboard_url) %>
 
 <% if asset.attachment %>
 <div style="margin-top: 20px; padding: 10px; border: 1px solid #f1f1f1; background-color: #f3f3f3;">
   <p style="margin: 0px;"><%= t :attached_file, "Attached File" %></p>
   <ul style="padding-left: 20px;">
     <li><%= asset.attachment.display_name %> - <%= asset.attachment.readable_size %>
-        <a href="<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/files/<%= asset.attachment_id %>/download">[<%= t :download, "download" %>]</a></li>
+        <a href="<%= polymorphic_url([asset.context, :file_download], file_id: asset.attachment) %>">[<%= t :download, "download" %>]</a></li>
   </ul>
 </div>
 <% end %>

app/messages/announcement_created_by_you.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/announcements/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <%= t :body, "You created this Announcement: %{title}, %{course}", :title => %{<b><a href="#{ content :link }">#{h asset.title}</a></b>}.html_safe, :course => asset.context.name %>

app/messages/announcement_created_by_you.summary.erb

@@ -1,9 +1,9 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/announcements/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>
   <%= before_label asset.title %> <%= asset.context.name %>
 <% end %>
 
-<%= CanvasTextHelper.truncate_text(html_to_text(asset.message, :base_url => "#{HostUrl.protocol}://#{HostUrl.context_host(asset.context)}"), :max_length => 500) %>
+<%= CanvasTextHelper.truncate_text(html_to_text(asset.message, :base_url => dashboard_url), :max_length => 500) %>

app/messages/announcement_created_by_you.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.context_id %>/announcements/<%= asset.id %>
+<%= polymorphic_url([asset.context, asset]) %>
 <% end -%>
-<%= t :body, "Canvas Alert - You created this Announcement: %{title}, %{course}.", :title => asset.title, :course => asset.context.name %>
+<%= t :body, "Canvas Alert - You created this Announcement: %{title}, %{course}.", :title => asset.title, :course => asset.context.name %>

app/messages/announcement_reply.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/discussion_topics/<%= asset.discussion_topic_id %>
+  <%= polymorphic_url([asset.context, :discussion_topic], id: asset.discussion_topic_id) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -8,7 +8,7 @@
 
 <%= t :body, "%{user} posted a new comment on the announcement: %{discussion_topic} for %{course}:", :user => asset.user.short_name, :discussion_topic => asset.title, :course => asset.context.name %>
 
-<%= html_to_text(asset.message, :base_url => "#{HostUrl.protocol}://#{HostUrl.context_host(asset.context)}") %>
+<%= html_to_text(asset.message, :base_url => dashboard_url) %>
 
 <%= t :discussion_entry_reply_message, "Join the conversation using the link below, or comment by replying to this message." %>
 <%= content :link %>

app/messages/announcement_reply.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/discussion_topics/<%= asset.discussion_topic_id %>
+  <%= polymorphic_url([asset.context, :discussion_topic], id: asset.discussion_topic_id) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -15,7 +15,7 @@
 <p><%= t :body, "%{user} posted a new comment on the announcement: %{discussion_topic} for %{course}:", :user => asset.user.short_name, :discussion_topic => asset.title, :course => asset.context.name %></p>
 
 <p>
-  <%= html_to_simple_html(asset.message, :base_url => "#{HostUrl.protocol}://#{HostUrl.context_host(asset.context)}") %>
+  <%= html_to_text(asset.message, :base_url => dashboard_url) %>
 </p>
 
 <% if avatar_enabled? %>

app/messages/announcement_reply.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/discussion_topics/<%= asset.discussion_topic_id %>
+  <%= polymorphic_url([asset.context, :discussion_topic], id: asset.discussion_topic_id) %>
 <% end %>
 
 <%= t :body, "New Comment on Announcement:  %{discussion_topic}, %{course}", :discussion_topic => %{<b><a href="#{ content :link }">#{ h asset.title }</a></b>}.html_safe, :course => asset.context.name %>

app/messages/announcement_reply.summary.erb

@@ -1,9 +1,9 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/discussion_topics/<%= asset.discussion_topic_id %>
+  <%= polymorphic_url([asset.context, :discussion_topic], id: asset.discussion_topic_id) %>
 <% end %>
 
 <% define_content :subject do %>
   <%= t :subject, "New Comment on Announcement: %{discussion_topic}: %{course}", :discussion_topic => asset.title, :course => asset.context.name %>
 <% end %>
 
-<%= CanvasTextHelper.truncate_text(html_to_text(asset.message, :base_url => "#{HostUrl.protocol}://#{HostUrl.context_host(asset.context)}"), :max_length => 200) %>
+<%= CanvasTextHelper.truncate_text(html_to_text(asset.message, :base_url => dashboard_url), :max_length => 200) %>

app/messages/announcement_reply.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/discussion_topics/<%= asset.discussion_topic_id %>
+<%= polymorphic_url([asset.context, :discussion_topic], id: asset.discussion_topic_id) %>
 <% end -%>
-<%= t :body, "Canvas Alert - Announcement Comment: %{discussion_topic}, %{course}.", :discussion_topic => asset.title, :course => asset.context.name %>
+<%= t :body, "Canvas Alert - Announcement Comment: %{discussion_topic}, %{course}.", :discussion_topic => asset.title, :course => asset.context.name %>

app/messages/appointment_canceled_by_user.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% courses = asset.appointment_group.participant_type == 'Group' ?

app/messages/appointment_canceled_by_user.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :footer_link do %>
@@ -50,4 +50,3 @@
 </table>
 <p style="font-weight: bold;"><%= t :cancel_reason, 'Reason for canceling' %></p>
 <p><%= data.cancel_reason || t(:no_reason_given, "none given") %></p>
-

app/messages/appointment_canceled_by_user.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <%= t :message, '%{user} canceled his/her reservation for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %>

app/messages/appointment_canceled_by_user.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end -%>
-<%= t :message, 'Canvas Alert - %{user} canceled his/her reservation for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %>
+<%= t :message, 'Canvas Alert - %{user} canceled his/her reservation for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %>

app/messages/appointment_deleted_for_user.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% courses = asset.appointment_group.participant_type == 'Group' ?

app/messages/appointment_deleted_for_user.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :footer_link do %>
@@ -48,4 +48,3 @@
 </table>
 <p style="font-weight: bold;"><%= t :cancel_reason, 'Reason for canceling' %></p>
 <p><%= data.cancel_reason || t(:no_reason_given, "none given") %></p>
-

app/messages/appointment_deleted_for_user.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <%= t :message, '%{user} canceled your time slot for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %><br>

app/messages/appointment_deleted_for_user.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end -%>
-<%= t :message, 'Canvas Alert - Your time slot for "%{appointment_name} was canceled".', :appointment_name => asset.title %>
+<%= t :message, 'Canvas Alert - Your time slot for "%{appointment_name} was canceled".', :appointment_name => asset.title %>

app/messages/appointment_group_deleted.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups
+  <%= appointment_groups_url %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_group_deleted.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups
+  <%= appointment_groups_url %>
 <% end %>
 
 <% define_content :subject do %>
@@ -33,4 +33,4 @@
     </tr>
 </table>
 <p style="font-weight: bold;"><%= t :cancel_reason, 'Reason for canceling' %></p>
-<p><%= data.cancel_reason || t(:no_reason_given, "none given") %></p>
+<p><%= data.cancel_reason || t(:no_reason_given, "none given") %></p>

app/messages/appointment_group_deleted.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups
+  <%= appointment_groups_url %>
 <% end -%>
 <%= t :message, 'Canvas Alert - All appointments for "%{appointment_name} have been canceled".', :appointment_name => asset.title %>

app/messages/appointment_group_published.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_group_published.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -42,4 +42,4 @@
           <td valign="top"><%= asset.available_slots %></td>
       </tr>
     <% end %>
-</table>
+</table>

app/messages/appointment_group_published.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <%= t :message, 'Time slots for "%{appointment_name}" are now available for signup.', :appointment_name => asset.title %><br>

app/messages/appointment_group_published.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_group_published.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end -%>
-<%= t :message, 'Canvas Alert - Signups are open for "%{appointment_name}".', :appointment_name => asset.title %>
+<%= t :message, 'Canvas Alert - Signups are open for "%{appointment_name}".', :appointment_name => asset.title %>

app/messages/appointment_group_updated.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_group_updated.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_group_updated.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <%= t :message, 'Time slots have been added to "%{appointment_name}" and are available for signup.', :appointment_name => asset.title %><br>

app/messages/appointment_group_updated.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_group_updated.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.contexts.first) %>/appointment_groups/<%= asset.id %>
+  <%= appointment_group_url(asset) %>
 <% end -%>
-<%= t :message, 'Canvas Alert - New time slots are available for "%{appointment_name}".', :appointment_name => asset.title %>
+<%= t :message, 'Canvas Alert - New time slots are available for "%{appointment_name}".', :appointment_name => asset.title %>

app/messages/appointment_reserved_by_user.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_reserved_by_user.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_reserved_by_user.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <%= t :message, '%{user} has signed up for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %><br>

app/messages/appointment_reserved_by_user.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end -%>
-<%= t :message, 'Canvas Alert - %{user} has signed up for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %>
+<%= t :message, 'Canvas Alert - %{user} has signed up for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %>

app/messages/appointment_reserved_for_user.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_reserved_for_user.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -49,4 +49,4 @@
           <td valign="top"><%= asset.appointment_group.available_slots %></td>
       </tr>
     <% end %>
-</table>
+</table>

app/messages/appointment_reserved_for_user.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <%= t :message, '%{user} has signed you up for "%{appointment_name}".', :user => data.updating_user.name, :appointment_name => asset.title %><br>

app/messages/appointment_reserved_for_user.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/appointment_reserved_for_user.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.appointment_group.contexts.first) %>/appointment_groups/<%= asset.appointment_group.id %>
+  <%= appointment_group_url(asset.appointment_group) %>
 <% end -%>
-<%= t :message, 'Canvas Alert - You have been signed up for "%{appointment_name}".', :appointment_name => asset.title %>
+<%= t :message, 'Canvas Alert - You have been signed up for "%{appointment_name}".', :appointment_name => asset.title %>

app/messages/assignment_changed.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
   
 <% define_content :subject do %>

app/messages/assignment_changed.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :footer_link do %>
@@ -12,4 +12,4 @@
   <%= t :subject, "Assignment Changed: %{title}, %{course}", :title => asset.title, :course => asset.context.name %>
 <% end %>
 
-<p><%= t :body, 'The assignment "%{title}" for %{course} has changed.', :title => asset.title, :course => asset.context.name %></p>
+<p><%= t :body, 'The assignment "%{title}" for %{course} has changed.', :title => asset.title, :course => asset.context.name %></p>

app/messages/assignment_changed.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
   
 <%= mt :body, "The assignment %{title_link} for %{course} has changed.", :title_link => markdown_safe("**[#{markdown_escape(asset.title)}](#{content(:link)})**"), :course => asset.context.name %>

app/messages/assignment_changed.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
   
 <% define_content :subject do %>

app/messages/assignment_changed.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end -%>
 <%= t('assignment_change', 'Canvas Alert - Change: %{assignment_name}, %{course_name}', :assignment_name => asset.title, :course_name => asset.context.name) %>

app/messages/assignment_created.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_created.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_created.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <%= t('new_assignment', 'A new assignment has been created for %{course_name}', :course_name => asset.context.name) %> 

app/messages/assignment_created.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_created.twitter.erb

@@ -1,5 +1,5 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end -%>
 <%= t('assignment_change', 'Canvas Alert - Change: %{assignment_name}, %{course_name}', :assignment_name => asset.title, :course_name => asset.context.name) %>
 

app/messages/assignment_due_date_changed.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_due_date_changed.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -22,4 +22,4 @@
 <% else %>
   <%= t('no_due_date', 'No Due Date') %>
 <% end %>
-</p>
+</p>

app/messages/assignment_due_date_changed.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <%= t('assignment_due_date_changed_sentence', 'The due date for the assignment *%{assignment_name}* for %{course_name}, has changed to:', :assignment_name => asset.title, :course_name => asset.context.name, :wrapper => "<b><a href=\"#{content :link}\">\\1</a></b>") %>

app/messages/assignment_due_date_changed.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_due_date_changed.twitter.erb

@@ -1,5 +1,5 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end -%>
 <%= t('assignment_change', 'Canvas Alert - Date Change: %{assignment_name}, %{course_name}', :assignment_name => asset.title, :course_name => asset.context.name) %>
 

app/messages/assignment_due_date_override_changed.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment.id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_due_date_override_changed.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment.id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_due_date_override_changed.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment.id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment]) %>
 <% end %>
 
 <%= t('assignment_due_date_changed_sentence', 'The due date for the assignment *%{assignment_name}* for %{course_name} (%{override}) has changed to:', :assignment_name => asset.assignment.title, :course_name => asset.assignment.context.name, :override => asset.title, :wrapper => "<b><a href=\"#{content :link}\">\\1</a></b>") %>

app/messages/assignment_due_date_override_changed.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment.id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_due_date_override_changed.twitter.erb

@@ -1,5 +1,5 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment.id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment]) %>
 <% end -%>
 <%= t('assignment_change', 'Canvas Alert - Date Change: %{assignment_name}, %{course_name} (%{override})', 
         :assignment_name => asset.assignment.title, 

app/messages/assignment_graded.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_graded.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_graded.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <%= t('the_assignment_is_graded', 'The assignment, %{assignment_name}, has been graded.', :assignment_name => asset.title) %>

app/messages/assignment_graded.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_graded.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end -%>
 <%= t('assignment_graded', 'Canvas Alert - Graded: %{assignment_name}, %{course_name}', :assignment_name => asset.title, :course_name => asset.context.name) %>

app/messages/assignment_resubmitted.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_resubmitted.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_resubmitted.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <%= mt('user_resubmitted', '**%{user_name}** has just turned in a re-submission for **%{assignment_name}** in the course %{course_name}', :user_name => asset.user.name, :assignment_name => asset.assignment.title, :course_name => asset.assignment.context.name) %>

app/messages/assignment_resubmitted.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_resubmitted.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end -%>
 <%= t('user_resubmitted', 'Canvas Alert - Resubmission: %{user_name}, %{assignment_name}', :user_name => asset.user.name, :assignment_name => asset.assignment.title) %>

app/messages/assignment_submitted.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_submitted.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_submitted.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <%= mt('user_submitted', '**%{user_name}** has just turned in a submission for **%{assignment_name}** in the course %{course_name}', :user_name => asset.user.name, :assignment_name => asset.assignment.title, :course_name => asset.assignment.context.name) %>

app/messages/assignment_submitted.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_submitted.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end -%>
 <%= t('user_submitted', 'Canvas Alert - Submission: %{user_name}, %{assignment_name}', :user_name => asset.user.name, :assignment_name => asset.assignment.title) %>

app/messages/assignment_submitted_late.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_submitted_late.email.html.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>
@@ -15,4 +15,4 @@
 <p><%= t('user_resubmitted_sentence', '%{user_name} has just turned in a late submission for %{assignment_name} in the course %{course_name}',
          :user_name => asset.user.name,
          :assignment_name => asset.assignment.title,
-         :course_name => asset.assignment.context.name) %></p>
+         :course_name => asset.assignment.context.name) %></p>

app/messages/assignment_submitted_late.facebook.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <%= mt('user_resubmitted_sentence', '**%{user_name}** has just turned in a late submission for **%{assignment_name}** in the course %{course_name}', :user_name => asset.user.name, :assignment_name => asset.assignment.title, :course_name => asset.assignment.context.name) %>

app/messages/assignment_submitted_late.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end %>
 
 <% define_content :subject do %>

app/messages/assignment_submitted_late.twitter.erb

@@ -1,4 +1,4 @@
 <% define_content :link do -%>
-<%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.assignment.context) %>/<%= asset.assignment.context.class.to_s.downcase.pluralize %>/<%= asset.assignment.context_id %>/assignments/<%= asset.assignment_id %>/submissions/<%= asset.user_id %>
+  <%= polymorphic_url([asset.assignment.context, asset.assignment, :submissions], id: asset.user_id) %>
 <% end -%>
 <%= t('user_submitted', 'Canvas Alert - Late Submission: %{user_name}, %{assignment_name}', :user_name => asset.user.name, :assignment_name => asset.assignment.title) %>

app/messages/assignment_unmuted.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
   
 <% define_content :subject do %>

app/messages/assignment_unmuted.email.html.erb

@@ -1,7 +1,7 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
-  
+
 <% define_content :subject do %>
   <%= t :subject, "Assignment Unmuted: %{title}, %{course}", :title => asset.title, :course => asset.context.name %>
 <% end %>

app/messages/assignment_unmuted.summary.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/assignments/<%= asset.id %>
+  <%= polymorphic_url([asset.context, asset]) %>
 <% end %>
   
 <% define_content :subject do %>

app/messages/collaboration_invitation.email.erb

@@ -1,5 +1,5 @@
 <% define_content :link do %>
-  <%= HostUrl.protocol %>://<%= HostUrl.context_host(asset.collaboration.context) %>/<%= asset.collaboration.context.class.base_class.to_s.downcase.pluralize %>/<%= asset.collaboration.context_id %>/collaborations/<%= asset.collaboration.id %>
+  <%= polymorphic_url([asset.collaboration.context, asset.collaboration]) %>
 <% end %>
 
 <% define_content :subject do %>