I got it!!!

def show
    @post = Post.find(params[:id])
    @new_comment = Comment.build_from(@post, current_user.id, "")
    respond_to do |format|
      format.html {render :file => "posts/modal", layout: false}
      format.js {render :file => "posts/modal", layout: false}
      format.json {render json: @post }
    end
  end

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