Added comments

app/models/comment.rb

@@ -0,0 +1,37 @@
+class Comment < ActiveRecord::Base
+	belongs_to :user
+
+	def comment_object
+		model_type.classify.constantize.find(model_id)
+	end
+
+	def set_model(model)
+		model_type = model.class.name.tableize
+		model_id = model.id
+	end
+
+	def self.for(model)
+		where(model_type: model.class.name.tableize, model_id: model.id).order(created_at: :asc)
+	end
+
+	def self.create_for(model, user, comment)
+		create(
+			model_type: model.class.name.tableize,
+			model_id: model.id,
+			user_id: user.id,
+			comment: comment
+		)
+	end
+
+    def add_comment(user, comment)
+        Comment.create_for(self, user, comment)
+    end
+
+    def comments
+        Comment.for(self)
+    end
+
+    def reply?
+    	model_type == 'comments'
+    end
+end

app/models/workshop.rb

@@ -146,6 +146,14 @@ class Workshop < ActiveRecord::Base
         end
         return notify_list
     end
+
+    def comments
+        Comment.for(self)
+    end
+
+    def add_comment(user, comment)
+        Comment.create_for(self, user, comment)
+    end
     
     private
         def make_slug