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Rails:在JavaScript中捕获错误消息

作者：思考机器3 | 2023-04-10 19:08:23

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我正在使用ajax创建属于特定主题的帖子,我在帖子索引页面中呈现表单.每个帖子都有很多标签,我也使用设计认证和CanCanCan授权.

我需要捕获帖子提交的错误消息并通过此JavaScript模板Create.js.erb在浏览器中显示自定义错误消息,而不是在帖子表单中.

以下是代码:

后控制器

class PostsController < ApplicationController
  load_and_authorize_resource
  before_action :set_post, only: [:show, :edit, :update, :destroy, :update_status]
  skip_before_action :verify_authenticity_token

  # GET /posts
  # GET /posts.json
  def index
    if params[:topic_id].present?
          @topic = Topic.find(params[:topic_id])
          @posts = @topic.posts.paginate(page: params[:page], per_page: 10)
      @post = @topic.posts.new
    else
      @posts = Post.eager_load(:topic, :user).paginate(page: params[:page], per_page: 10)
    end
    @tags =Tag.all
    end

  # GET /posts/1
  # GET /posts/1.json
  def show
      @tags = @posts.tags
  end

  def update_status
      current_user.posts<<(@posts)
  end

  # GET /posts/new
  def new
      @topic = Topic.find(params[:topic_id])
    @posts = @topic.posts.new
    @tags =Tag.all
  end

  # GET /posts/1/edit
  def edit
    @tags = @posts.tags
  end

  # POST /posts
  # POST /posts.json
  def create

      @topic = Topic.find(params[:topic_id])
    @posts = @topic.posts.create(post_params)

    respond_to do |format|
      @posts.user_id = current_user.id
      if @posts.save
        format.html { redirect_to topic_posts_path(@topic), notice: 'Post was successfully created.' }
        format.js
        format.json { render :show, status: :created, location: @posts }

      else
        format.html { render :new }
        format.json { render json: @posts.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /posts/1
  # PATCH/PUT /posts/1.json
  def update
      @tags = @posts.tags
    respond_to do |format|

      if params[:rate].to_i>0
        @posts.ratings.create(:star => params[:rate])
        format.html { redirect_to post_path(@posts), notice: 'Rating was successfully updated.' }

      elsif @posts.update(post_params)
        format.html { redirect_to post_path(@posts), notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @posts }

      else
        format.html { render :edit }
        format.json { render json: @posts.errors, status: :unprocessable_entity }
      end
    end
  end


  # DELETE /posts/1
  # DELETE /posts/1.json
  def destroy
    @posts.destroy
    respond_to do |format|
      format.html { redirect_to topic_posts_url(@posts.topic_id), notice: 'Post was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_post
     @posts = Post.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def post_params
      params.require(:post).permit(:image, :name, :message, :topic_id, {tag_ids:[]}, :rate, :user_id)
    end

  protected

    def json_request?
      request.format.json?
    end
end

发表表格

<%= form_for [@topic, @post], remote: true do |f| %>
  <% if @post.errors.any? %>
    

      
<%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:


      
    
      <% @post.errors.full_messages.each do |message| %>
        
  • <%= message %>
    • 
      <% end %>
      

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