Rails 4.2 - dependent :: restrict_with_error - 访问错误

Question

:restrict_with_error如果存在关联的对象rails关联基础,则会将错误添加到所有者

我在代码中添加了以下内容:

class Owner < ActiveRecord::Base
  has_many :things, dependent: :restrict_with_error
end

我的理解是,当我试图删除的业主有相关的东西,然后错误应该提高.在我的show动作中,owners_controller我尝试访问错误但无法找到它们:

def show
  @owner = Owner.find(params[:id])
  @owner.errors
end

更新 - 删除代码

def destroy
  @owner = Owner.find(params[:id])
  @owner.destroy
  flash[:notice] = "Owner Deleted Successfully"
  respond_with(@owner)
end

Answer 1

鉴于你的代码......

def destroy
  @owner = Owner.find(params[:id])
  @owner.destroy
  flash[:notice] = "Owner Deleted Successfully"
  respond_with(@owner)
end

def show
  @owner = Owner.find(params[:id])
  @owner.errors
end

在您尝试访问错误时,将不会有任何错误.

错误是暂时的.它们不会持久存在于对象中,并且它们不会交叉请求.它们仅存在于生成错误的同一请求中的模型上.

在您调用之后,代码中唯一可以提供错误的点就在内部destroy.它们永远不会出现在您的行动中.@owner.destroyshow

def destroy
  @owner = Owner.find(params[:id])
  @owner.destroy
  # You must check for @owner.errors here
  flash[:notice] = "Owner Deleted Successfully"
  respond_with(@owner)
end