自定義驗證似乎未添加錯誤

Question

我試圖阻止用戶使用驗證投票給自己。

提交自投票將使基本提示“不接受投票”。 但不會添加驗證錯誤“您無法為自己投票”。

如何將錯誤添加到閃存？

在我的模型中

class Imagevote < ActiveRecord::Base
    validate :cannot_vote_for_self


    def cannot_vote_for_self
        if voter_id == voted_id
        errors.add(:base, "You cannot vote for your self")
        end
    end
end

在我的控制器中

class ImagevotesController < ApplicationController

    def create
        @imagevote = Imagevote.new(imagevote_params)
        @collection = Collection.find(params[:imagevote][:collection_id])
        @imagevote.voted_id = @collection.user_id
        if @imagevote.save
            flash[:success] = "Vote accepted."
            redirect_to @imagevote
        else
            flash[:success] = "Vote not accepted."
            redirect_to :back
        end
    end

    def update
        @imagevote = Imagevote.find(params[:id])
        @collection = Collection.find(params[:imagevote][:collection_id])
        @imagevote.voted_id = @collection.user_id
        if @imagevote.update_attributes(imagevote_params)
            flash[:success] = "Vote changed."
            redirect_to @imagevote
        else
        flash[:success] = "Vote not accepted."
            redirect_to :back
        end
    end

我認為錯誤已插入到我的應用程序布局視圖中

<% flash.each do |key, value| %>
        <%= content_tag(:div, raw(value), class: "alert alert-#{key}") %>
<% end %> 

Answer 1

以下

errors.add(:base, "You cannot vote for your self")

將錯誤添加到Model Imagevote的實例。 它們不會被添加到flash哈希中。

為了顯示validation error messages ，您需要在

<% if @imagevote.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@imagevote.errors.count, "error") %>
        prohibited this user from being saved:</h2>
      <ul>
        <% @imagevote.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
      </ul>
    </div>
  <% end %> 

在您要creating/updating Imagevote對象的視圖中。

編輯

如下更新cannot_vote_for_self驗證方法：

   def cannot_vote_for_self
        if voter_id == voted_id
        errors.add(:vote, "You cannot vote for your self")
        end
    end

在控制器操作中設置flash message ，如下所示：

  def create
        @imagevote = Imagevote.new(imagevote_params)
        @collection = Collection.find(params[:imagevote][:collection_id])
        @imagevote.voted_id = @collection.user_id
        if @imagevote.save
            flash[:success] = "Vote accepted."
            redirect_to @imagevote
        else
            flash[:alert] = "Vote not accepted."
            flash[:alert] << @imagevote.errors[:vote].first unless @imagevote.errors[:vote].nil?
            redirect_to :back
        end
    end