Question

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所以我收到以下错误：< p>

undefined method `errors' for #<Comment::ActiveRecord_Associations_CollectionProxy:0x00007f1a3e2ecf48>

我可以得到评论数之类的信息，但是，我无法显示任何验证错误。

这就是我所拥有的代码

_new_comment

<% if signed_in? %>
  <div class="row">
    <%= form_with(model: [@product, @product.comments.build], local: true) do |f| %>
      <% if @product.comments.errors.any? %>
        <div id="error_explanation">
          <h2><%= pluralize(@product.comments.errors.count, "error") %> prohibited this comment from being saved:</h2>

          <ul>
          <% @product.comments.errors.full_messages.each do |message| %>
            <li><%= message %></li>
          <% end %>
          </ul>
        </div>
      <% end %>

comments_controller

class CommentsController < ApplicationController
  def create
    @product = Product.find(params[:product_id])
    @comment = @product.comments.new(comment_params)
    @comment.user = current_user
    @comment.save

    respond_to do |format|
      if @comment.save
        format.html { redirect_to @product, notice: 'Review was successfully created.' }
        format.json { render :show, status: :created, location: @product }
      else
        format.html { redirect_to @product, alert: 'Review was not saved successfully.' }
        format.json { render json: @comment.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
  end

  private
    def comment_params
      params.require(:comment).permit(:user_id, :body, :rating)
    end
end

感谢您的帮助。

Answer 1

问题

您不能在errors对象上访问ActiveRecord::Relation，但只能访问单个Comment对象。
在控制器操作create中，您对未保存注释执行redirect_to(@product)，注释将忽略已构建的@comment对象并构建一个新对象（通过form_with(model: [@product, @product.comments.build]) ）呈现评论表单时。相反，您只需要render个具有已构建的@comment对象的产品页面即可。
您在@comment.save动作中有两次create。

解决方案

products_controller.rb

def show
  # your current logic
  @comment = @product.comments.build
  # render
end

comments_controller.rb

class CommentsController < ApplicationController
  def create
    @product = Product.find(params[:product_id])
    @comment = @product.comments.new(comment_params)
    @comment.user = current_user

    respond_to do |format|
      if @comment.save
        format.html { redirect_to @product, notice: 'Review was successfully created.' }
        format.json { render :show, status: :created, location: @product }
      else
        format.html { render 'products/show', alert: 'Review was not saved successfully.' }
        format.json { render json: @comment.errors, status: :unprocessable_entity }
      end
    end
  end

  private

  def comment_params
    params.require(:comment).permit(:user_id, :body, :rating)
  end
end

_new_comment.html.erb

<%= form_with(model: [@product, @comment], local: true) do |f| %>
  <% if @comment.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@comment.errors.count, "error") %> prohibited this comment from being saved:</h2>

      <ul>
        <% @comment.errors.full_messages.each do |message| %>
          <li><%= message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>
<% end %>

＃<评论的未定义方法'错误'无法=“ =” get =“”错误

1 个答案:

问题

解决方案