@ mymodel.user = current_user不适合我 [英] @mymodel.user = current_user is not working for me

问题描述

我遵循了这些问题（一个和两个）关于如何调整我的方法与目前的用户只有这样他们有特定的user_id来编辑，更新，创建和销毁他们的产品。

这是我的代码：

我的迁移：

  class CreateProducts< ActiveRecord :: Migration 
 def self.up 
 create_table：products do | t | 
 t.string：name 
 t.date：date 
 t.decimal：price，，default => 0，：precision => 10，scale => 2 
 t.integer：user_id 
 t.float：纬度
 t.float：longitude 
  

控制器：

  class ProductsController< ApplicationController 
 before_filter：authenticate_user！ 
 
 def index 
 @products = Product.all 
 
 def show 
 @product = Product.find（params [：id]）
 
 def new 
 @product = Product.new 
 
 def edit 
 @ product.user = current_user 
 @product = Product.find（params [ ：id]）
 end 
 
 def create 
 @ product.user = current_user 
 @product = Product.new（params [：product]）
 
 def update 
 @ product.user = current_user 
 @product = Product.find（params [：id]）
 
 
 def destroy 
 @ product.user = current_user 
 @product = Product.find（params [：id]）
 @ product.destroy 
  

产品型号：

  ActiveRecord :: Base 
 attr_accessible：name，：date，：price，：tag_list 
 belongs_to：user 
 end 
  

然后Devise用户模型：

  class User< ActiveRecord :: Base 
 
 devise：database_authenticatable，：可注册，
：可恢复，可记忆，可追溯，可验证
 attr_accessible：电子邮件，密码，密码确认，：remember_me 
 
 has_many：products，：dependent => ：销毁
  

我尝试提交，然后突然出现：

ProductController中的NoMethodError＃create

 未定义的方法`user =对于nil：NilClass 
  

我缺少或做错了什么？

提前感谢

解决方案

您正在尝试分配@product。使用者在拥有产品之前。首先找到产品，然后分配给用户。

  @product = Product.find（params [：id]） 
 @ product.user = current_user 
  

除了创建要限制的位置以外的操作产品到current_user，你可以这样做（假设你在用户中设置 has_many：products 关联模型。

  @product = current_user.products.find（params [：id]）
  

这将限制只有那些具有user_id等于current_user的产品。

I followed these questions(one and two) on how to adjust my methods with the current user only so they have the specific user_id to edit,update, create and destroy their products.

Here is my code:

My Migration:

class CreateProducts < ActiveRecord::Migration
  def self.up
    create_table :products do |t|
      t.string :name
      t.date :date
      t.decimal  :price, :default => 0, :precision => 10, :scale => 2
      t.integer :user_id
      t.float :latitude
      t.float :longitude

the Controller:

class ProductsController < ApplicationController
  before_filter :authenticate_user!

  def index
    @products = Product.all

  def show
    @product = Product.find(params[:id])

  def new
   @product = Product.new

  def edit
    @product.user = current_user
    @product = Product.find(params[:id])
  end

  def create
    @product.user = current_user
    @product = Product.new(params[:product])

  def update
    @product.user = current_user
    @product = Product.find(params[:id])


  def destroy
    @product.user = current_user
    @product = Product.find(params[:id])
    @product.destroy

Product Model:

class Product < ActiveRecord::Base
    attr_accessible :name, :date, :price, :tag_list 
    belongs_to :user
end

then the Devise User Model:

class User < ActiveRecord::Base

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  attr_accessible :email, :password, :password_confirmation, :remember_me 

  has_many :products,        :dependent => :destroy

I try to submit it and then suddenly this pops up:

NoMethodError in ProductsController#create

undefined method `user=' for nil:NilClass

What am i missing or doing wrong?

Thanks in advance!

解决方案

You are trying to assign @product.user before you have a product. Do your find on the product first, then assign the user.

@product = Product.find(params[:id])
@product.user = current_user

For the actions other than create where you want to restrict the product to the current_user, you can do something like this (assuming you setup the has_many :products association in your User model.

@product = current_user.products.find(params[:id])

That will restrict find to just those products that have the user_id equal to the current_user.

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