def CommentNotifier
      if self = @commentable
      else 
        nil
      end
    end

  def create

      @comment = @commentable.comments.new(comment_params)
      @comment.user = @current_user
      if @comment.save
        CommentNotifier.call(comment, current_user)
        respond_to do |format|
          format.html { redirect_to @commentable }
          format.js # create.js.erb
        end
      else
        redirect_to cookies[:original_referrer]
        flash[:error] = "Comment could not be created."
      end
    end

NameError (undefined local variable or method `comment' for #<BlogPosts::CommentsController:0x00007fd7bfe4c818>
Did you mean?  @comment):
  
app/controllers/comments_controller.rb:18:in `create'

class BlogPosts::CommentsController < CommentsController

    before_action :set_commentable

    def new
     @comment = Comment.new(commentable: @commentable)
   end


  private

  def set_commentable
    @commentable = BlogPost.friendly.find(params[:blog_post_id])
  end
end

CommentNotifier.call(@comment, @current_user)

ArgumentError (wrong number of arguments (given 1, expected 2)):
  
app/models/comment_notifier.rb:12:in `initialize'
app/models/comment_notifier.rb:5:in `call'
app/controllers/comments_controller.rb:18:in `create'