enforce Like uniqueness at model instead of at the controller

codebender · codebender · commit e0453c17a326 · 2016-02-20T13:15:51.000-07:00
diff --git a/app/controllers/likes_controller.rb b/app/controllers/likes_controller.rb
@@ -8,7 +8,7 @@ def index
 
   def create
     @likeable = find_likeable
-    @likeable.likes.create!(user: current_user) unless current_user.likes?(@likeable)
+    @likeable.likes.create(user: current_user)
     respond_to do |format|
       format.js { render(json: @likeable.likes_count, status: :ok) }
     end
diff --git a/app/models/like.rb b/app/models/like.rb
@@ -4,4 +4,5 @@ class Like < ActiveRecord::Base
 
   validates :user, presence: true
   validates :likable, presence: true
+  validates_uniqueness_of :user, scope: [:likable_type, :likable_id]
 end
