Question

请帮我解决此错误。执行更新操作时会显示此错误。

错误：

NoMethodError in UsersController#update
undefined method `permit' for :user:Symbol

我的代码片段如下所示。

视图/用户/ edit.html.erb

<h1>Edit your data</h1>
<%= form_for @user,:url => {:action => 'update',:id => params[:id]} do |f| %>
    <% if @user.errors.any? %>
        <div id="error_explanation">
          <h2><%= pluralize(@user.errors.count, "error") %> prohibited this post from being saved:</h2>

          <ul>
            <% @user.errors.full_messages.each do |message| %>
                <li><%= message %></li>
            <% end %>
          </ul>
        </div>
    <% end %>
    <%= f.text_field:name,:value => @edit.name %>
    <%= f.email_field:email,:value => @edit.email %>
    <%= f.text_field:message,:value => @edit.message %>
    <%= f.submit "Update" %>
<% end %>
<%= link_to "Back",users_index_path %>

控制器/ users_controller.rb

class UsersController < ApplicationController
  def index

  end
  def new
    @user=User.new
  end
  def create
    @user=User.new(users_params)
    if @user.save
      flash[:notice]="Your data is saved succesfully"
      flash[:color]="valid"
      redirect_to :action => 'index'
    else
      flash[:alert]="You are entering wrong data"
      flash[:color]="invalid"
      render :new
    end
  end
  def show
    @user=User.all
  end
  def delete
   @user=User.find(params[:id])
    if @user.delete
      flash[:notice]=@user.name+"has deleted successfully"
      flash[:color]="valid"
      redirect_to :action => 'index'
    else
      flash[:alert]=@user.name+"could not delete.Please check it.."
      flash[:color]="invalid"
      render :show
    end
  end
  def edit
    @edit=User.find(params[:id])
    @user=User.new
  end
  def update
    @user=User.find(params[:id])
    if @user.update_attributes(update_params)
      flash[:notice]="Your data has updated successfully"
      flash[:color]="valid"
      redirect_to :action => 'index'
    else
      flash[:alert]="Your data could not update..check it.."
      flash[:color]="invalid"
      render :edit

    end
  end
  private
  def users_params
    params.require(:user).permit(:name, :email, :message,pets_attributes: [:name, :email,:message])
  end
  def update_params
    params.require (:user).permit(:name,:email,:message,pets_attributes: [:name, :email,:message])
  end
end

模型/ user.rb

class User < ActiveRecord::Base
  has_many :pets
  accepts_nested_attributes_for :pets
  EMAIL_REGEX = /\A[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\z/i
  validates :name,  :presence => true,:length => { :minimum => 5 }
  validates :email, :presence => true, :uniqueness => true, :format => EMAIL_REGEX
  validates :message,  :presence => true
end

请帮我解决上述错误。

Answer 1

require和(:user)之间有空格。您当前的代码相当于：

def update_params
  params.require(:user.permit(:name,:email,:message,pets_attributes: [:name, :email,:message]))
end

正如您现在所看到的，您在permit符号上调用:user方法，这是导致错误的直接原因。

应该是：

  def update_params
    params.require(:user).permit(:name,:email,:message,pets_attributes: [:name, :email,:message])
  end

BTW有两种完全相同的方法是毫无意义的。

Answer 2

检查你的问题：

you have a space after require and before (:user)

尝试：

 def update_params
   params.require(:user).permit(:name,:email,:message,
     pets_attributes: [:name, :email,:message])
  end

为了更好的方法，你可以只使用一种方法：

def user_params
   params.require(:user).permit(:name,:email,:message,
     pets_attributes: [:name, :email,:message])
end

您可以只使用一种方法并在新建和编辑中重复使用，而不是为新建和编辑使用单独的过滤方法。

保持简单干燥。

如何解决未定义的方法`permit＆＃39; for：user：ror-4中的符号错误

2 个答案: