class_inheritable_accessor -> class_attribute

refs CNVS-9166

Change-Id: Ie116881aaeae201222a658de1eb5fc608cec7d01
test-plan: N/A
Reviewed-on: https://gerrit.instructure.com/25726
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Jacob Fugal <jacob@instructure.com>
QA-Review: Jacob Fugal <jacob@instructure.com>

app/models/web_conference.rb

@@ -107,8 +107,13 @@ class WebConference < ActiveRecord::Base
     user_setting_fields[name] = options
   end
 
-  def self.user_setting_fields
-    read_inheritable_attribute(:user_setting_fields) || write_inheritable_attribute(:user_setting_fields, {})
+  if CANVAS_RAILS2
+    def self.user_setting_fields
+      read_inheritable_attribute(:user_setting_fields) || write_inheritable_attribute(:user_setting_fields, {})
+    end
+  else
+    class_attribute :user_setting_fields
+    self.user_setting_fields = {}
   end
 
   def self.user_setting_field_name(key)
@@ -133,8 +138,13 @@ class WebConference < ActiveRecord::Base
     send("#{key}_external_url", user, url_id) || []
   end
 
-  def self.external_urls
-    read_inheritable_attribute(:external_urls) || write_inheritable_attribute(:external_urls, {})
+  if CANVAS_RAILS2
+    def self.external_urls
+      read_inheritable_attribute(:external_urls) || write_inheritable_attribute(:external_urls, {})
+    end
+  else
+    class_attribute :external_urls
+    self.external_urls = {}
   end
 
   def self.external_url(name, options)

lib/send_to_inbox.rb

@@ -20,7 +20,11 @@ module SendToInbox
 
   module SendToInboxClassMethods
     def self.extended(klass)
-      klass.send(:class_inheritable_accessor, :send_to_inbox_block)
+      if CANVAS_RAILS2
+        klass.send(:class_inheritable_accessor, :send_to_inbox_block)
+      else
+        klass.send(:class_attribute, :send_to_inbox_block)
+      end
     end
 
     def on_create_send_to_inboxes(&block)

lib/send_to_stream.rb

@@ -19,8 +19,13 @@
 module SendToStream
   module SendToStreamClassMethods
     def self.extended(klass)
-      klass.send(:class_inheritable_accessor, :send_to_stream_block)
-      klass.send(:class_inheritable_accessor, :send_to_stream_update_block)
+      if CANVAS_RAILS2
+        klass.send(:class_inheritable_accessor, :send_to_stream_block)
+        klass.send(:class_inheritable_accessor, :send_to_stream_update_block)
+      else
+        klass.send(:class_attribute, :send_to_stream_block)
+        klass.send(:class_attribute, :send_to_stream_update_block)
+      end
       klass.has_one :stream_item, :as => :asset
     end