解决消息链接点击一次多一条的问题

app/models/course_message.rb

@@ -15,6 +15,8 @@ class CourseMessage < ActiveRecord::Base
   after_create :add_user_message
 
   def add_user_message
-    self.message_alls << MessageAll.new(:user_id => self.user_id)
+    if MessageAll.where("message_type = '#{self.class.to_s}' and message_id = '#{self.id}'").first.nil?
+      self.message_alls << MessageAll.new(:user_id => self.user_id)
+    end
   end
 end

app/models/forge_message.rb

@@ -22,6 +22,8 @@ class ForgeMessage < ActiveRecord::Base
   after_create :add_user_message
 
   def add_user_message
-    self.message_alls << MessageAll.new(:user_id => self.user_id)
+    if MessageAll.where("message_type = '#{self.class.to_s}' and message_id = '#{self.id}'").first.nil?
+      self.message_alls << MessageAll.new(:user_id => self.user_id)
+    end
   end
 end

app/models/memo_message.rb

@@ -12,6 +12,8 @@ class MemoMessage < ActiveRecord::Base
   after_create :add_user_message
 
   def add_user_message
-    self.message_alls << MessageAll.new(:user_id => self.user_id)
+    if MessageAll.where("message_type = '#{self.class.to_s}' and message_id = '#{self.id}'").first.nil?
+      self.message_alls << MessageAll.new(:user_id => self.user_id)
+    end
   end
 end

app/models/user_feedback_message.rb

@@ -11,6 +11,8 @@ class UserFeedbackMessage < ActiveRecord::Base
   after_save :add_user_message
 
   def add_user_message
-    self.message_alls << MessageAll.new(:user_id => self.user_id)
+    if MessageAll.where("message_type = '#{self.class.to_s}' and message_id = '#{self.id}'").first.nil?
+      self.message_alls << MessageAll.new(:user_id => self.user_id)
+    end
   end
 end