メソッド名が*comment_atになっている箇所を、*commented_atに修正

app/models/comment_callbacks.rb

@@ -11,37 +11,37 @@ def after_create(comment)
 
     return unless comment.commentable.instance_of?(Product)
 
-    update_last_comment_at(comment)
+    update_last_commented_at(comment)
     update_commented_at(comment)
     delete_product_cache(comment.commentable.id)
   end
 
   def after_update(comment)
     return unless comment.commentable.instance_of?(Product)
 
-    update_last_comment_at(comment)
+    update_last_commented_at(comment)
     update_commented_at(comment)
   end
 
   def after_destroy(comment)
     return unless comment.commentable.instance_of?(Product)
 
-    delete_last_comment_at(comment.commentable.id)
+    delete_last_commented_at(comment.commentable.id)
     delete_commented_at(comment)
     delete_product_cache(comment.commentable.id)
   end
 
   private
 
-  def reset_last_comment_at(product)
+  def reset_last_commented_at(product)
     product.mentor_last_commented_at = nil
     product.self_last_commented_at = nil
   end
 
-  def delete_last_comment_at(product_id)
+  def delete_last_commented_at(product_id)
     product = Product.find(product_id)
 
-    reset_last_comment_at(product)
+    reset_last_commented_at(product)
 
     product.comments.each do |comment|
       if comment.user.mentor
@@ -53,7 +53,7 @@ def delete_last_comment_at(product_id)
     product.save!
   end
 
-  def update_last_comment_at(comment)
+  def update_last_commented_at(comment)
     product = Product.find(comment.commentable.id)
     if comment.user.mentor
       product.mentor_last_commented_at = comment.updated_at