显示属性中的观点相关车型 [英] Displaying attributes for associated models in views

问题描述

我要获取用户的用户名或电子邮件（两者都在用户表）谁在创建博客应用的文章。目前，我能够从articles_controller.rb获取用户ID

I want to fetch username or email( both are in user table) of user who creates article in blog application. Currently I am able to fetch user id from articles_controller.rb

def create
  @article = Article.new(params[:article])
  @article.user_id = current_user.id
  @article.save
  redirect_to article_path(@article)
end

但不知道如何为获取相同的用户名或电子邮件。基本上我想显示文章索引页面上的用户名或电子邮件。请建议我如何让做了

but no idea how to fetch username or email for same. Basically I want to display username or email on article index page. Please suggest me to how to get done it

user.rb

class User < ActiveRecord::Base
    has_many :articles
    has_many :comments
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :username, :email, :password, :password_confirmation, :remember_me
   attr_accessible :title, :body
end

article.rb

article.rb

class Article < ActiveRecord::Base
   attr_accessible :title, :body
   has_many :comments
   belongs_to :user
end

articles_controller.rb

articles_controller.rb

class ArticlesController < ApplicationController
    def index
        @articles = Article.all
    end

    def show
      @article = Article.find(params[:id])
    end

    def new
      @article = Article.new
    end

    def create
      @article = Article.new(params[:article])
      @article.user_id = current_user.id
      @article.save
      redirect_to article_path(@article)
    end

    def destroy
      @article = Article.find(params[:id])
      @article.destroy
      redirect_to action:  'index'  
    end

    def edit
      @article = Article.find(params[:id])
    end

    def update
      @article = Article.find(params[:id])
      @article.update_attributes(params[:article])
      flash.notice = "Article '#{@article.title}' Updated!"
      redirect_to article_path(@article)
     end
end

文/ index.html.erb

article/index.html.erb

 <div style="color:#666666; margin-top:10px"> <%= article.created_at %></div>
     <div style="color:#666666; margin-top:10px"> <%= article.user_id %></div>

文章表

class CreateArticles < ActiveRecord::Migration
  def change
    create_table :articles do |t|
      t.string :title
      t.text  :body 
      t.timestamps
    end
    add_index :articles, [:user_id, :created_at]
  end
end

我能够在视图中获取用户ID，但是不知道怎么的用户名或电子邮件。
任何帮助将是AP preciated。

I am able to fetch user id in views but no idea how to username or email. Any help would be appreciated.

推荐答案

您已经定义了一个用户在文章协会与模型类belongs_to的：用户。这将创建对文章返回相关的用户，以便您在视图中的用户方法：

You have defined a user association on your Article model class with belongs_to :user. This creates a user method on Article that returns the associated user so you in your view:

<%= article.user.email %>

将输出相关的用户的电子邮件，或者：

will output the email of the associated user, or:

<%= article.user.email if article.user %>

，以满足用户的零值。或者写一个帮手因素这个逻辑了看法。

to cater for nil user values. Alternatively write a helper to factor this logic out of the view.

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