rails 5: fix several deprecation warnings

Change-Id: I43a3a36da77d19e81257fb923b34e431f3d6cbfa
Reviewed-on: https://gerrit.instructure.com/104952
Tested-by: Jenkins
Reviewed-by: Simon Williams <simon@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>

app/controllers/calendar_events_api_controller.rb

@@ -712,7 +712,7 @@ class CalendarEventsApiController < ApplicationController
           calendar.add_event(ics_event) if ics_event
         end
 
-        render :text => calendar.to_ical
+        render plain: calendar.to_ical
       end
       format.atom do
         feed = Atom::Feed.new do |f|

app/models/account_notification.rb

@@ -80,7 +80,7 @@ class AccountNotification < ActiveRecord::Base
         end
       end
 
-      roles = user.enrollments.shard(user).active.uniq.pluck(:type)
+      roles = user.enrollments.shard(user).active.distinct.pluck(:type)
 
       if roles == ['StudentEnrollment'] && !account.include_students_in_global_survey?
         current.reject! { |announcement| announcement.required_account_service == 'account_survey_notifications' }

app/models/appointment_group.rb

@@ -208,7 +208,7 @@ class AppointmentGroup < ActiveRecord::Base
       codes[:full] &= restrict_to_codes
       codes[:limited] &= restrict_to_codes
     end
-    uniq.
+    distinct.
         joins("JOIN #{AppointmentGroupContext.quoted_table_name} agc " \
               "ON appointment_groups.id = agc.appointment_group_id " \
               "LEFT JOIN #{AppointmentGroupSubContext.quoted_table_name} sc " \

app/models/attachment.rb

@@ -679,13 +679,13 @@ class Attachment < ActiveRecord::Base
         end
       end
     elsif method == :overwrite
-      atts.update_all(:replacement_attachment_id => self) # so we can find the new file in content links
+      atts.update_all(replacement_attachment_id: self.id) # so we can find the new file in content links
       copy_access_attributes!(atts) unless atts.empty?
       atts.each do |a|
         # update content tags to refer to the new file
-        ContentTag.where(:content_id => a, :content_type => 'Attachment').update_all(:content_id => self)
+        ContentTag.where(:content_id => a, :content_type => 'Attachment').update_all(content_id: self.id)
         # update replacement pointers pointing at the overwritten file
-        context.attachments.where(:replacement_attachment_id => a).update_all(:replacement_attachment_id => self)
+        context.attachments.where(:replacement_attachment_id => a).update_all(replacement_attachment_id: self.id)
         # delete the overwritten file (unless the caller is queueing them up)
         a.destroy unless opts[:caller_will_destroy]
         deleted_attachments << a

app/models/calendar_event.rb

@@ -293,7 +293,7 @@ class CalendarEvent < ActiveRecord::Base
   end
 
   def cache_child_event_ranges!
-    events = child_events(true)
+    events = CANVAS_RAILS4_2 ? child_events(true) : child_events.reload
 
     if events.present?
       CalendarEvent.where(:id => self).

app/models/conversation_message.rb

@@ -108,7 +108,7 @@ class ConversationMessage < ActiveRecord::Base
   end
 
   def after_participants_created_broadcast
-    conversation_message_participants(true) # reload this association so we get latest data
+    CANVAS_RAILS4_2 ? conversation_message_participants(true) : conversation_message_participants.reload # reload this association so we get latest data
     @re_send_message = true
     broadcast_notifications
     queue_create_stream_items

app/models/user.rb

@@ -1679,7 +1679,7 @@ class User < ActiveRecord::Base
       current_and_concluded.
       where(user_id: self).
       joins(:course).
-      uniq.
+      distinct.
       pluck(:account_id)
 
     longest_chain = [in_root_account]

config/initializers/active_record.rb

@@ -645,7 +645,7 @@ ActiveRecord::Relation.class_eval do
     order_values.any? ||
       group_values.any? ||
       select_values.to_s =~ /DISTINCT/i ||
-      uniq_value ||
+      distinct_value ||
       select_values_necessitate_temp_table?
   end
   private :find_in_batches_needs_temp_table?

lib/dates_overridable.rb

@@ -89,7 +89,7 @@ module DatesOverridable
     Shard.partition_by_shard(assignments) do |shard_assignments|
       Enrollment.where(course_id: shard_assignments.map(&:context), user_id: user).
           active.
-          uniq.
+          distinct.
           # duplicate the subquery logic of ObserverEnrollment.observed_users, where it verifies the observee exists
           where("associated_user_id IS NULL OR EXISTS (
             SELECT 1 FROM #{Enrollment.quoted_table_name} e2

lib/messageable_user/calculator.rb

@@ -774,7 +774,7 @@ class MessageableUser
     def uncached_messageable_groups
       fully_visible_scope = GroupMembership.
         select("group_memberships.group_id AS group_id").
-        uniq.
+        distinct.
         joins(:user, :group).
         where(:workflow_state => 'accepted').
         where("groups.workflow_state<>'deleted'").
@@ -783,7 +783,7 @@ class MessageableUser
 
       section_visible_scope = GroupMembership.
         select("group_memberships.group_id AS group_id").
-        uniq.
+        distinct.
         joins(:user, :group).
         joins(<<-SQL).
           INNER JOIN #{Enrollment.quoted_table_name} ON