Question

我正在尝试一个应该有效的简单关联。我按照http://ruby.railstutorial.org/chapters/和第10章

的教程进行了操作

这里我写下了

模型/客户

class Customer < ActiveRecord::Base

    has_many :posts, dependent: :destroy


  attr_accessible :name, :email, :password, :password_confirmation
  has_secure_password

模型/后

class Post < ActiveRecord::Base

    belongs_to :customer
    attr_accessible :description, :post_finish_at, :post_how, :post_location

控制器/客户

class CustomersController < ApplicationController

  before_filter :signed_in_customer, only: [:edit, :update]
  before_filter :correct_customer,   only: [:edit, :update]


  def index
    @customers = Customer.all
  end

  def show
    @customer = Customer.find(params[:id])
    @posts = @customer.posts
  end  ...

控制器/帖子 - 应该是无关紧要的，因为我做了部分 class PostsController＆lt; ApplicationController中

  # GET /posts
  # GET /posts.json
  def index
    @posts = Post.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @posts }
    end
  end

  # GET /posts/1
  # GET /posts/1.json
  def show
    @post = Post.find(params[:id])
        respond_to do |format|
            format.html # show.html.erb
            format.json { render json: @post }
        end
  end

  # GET /posts/new
  # GET /posts/new.json
  def new
    @post = Post.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @post }
    end
  end

  # GET /posts/1/edit
  def edit
    @post = Post.find(params[:id])
  end

  # POST /posts
  # POST /posts.json
  def create
    @post = Post.new(params[:post])

    respond_to do |format|
      if @post.save
        format.html { redirect_to @post, notice: 'Post was successfully created.' }
        format.json { render json: @post, status: :created, location: @post }
      else
        format.html { render action: "new" }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /posts/1
  # PUT /posts/1.json
  def update
    @post = Post.find(params[:id])

    respond_to do |format|
      if @post.update_attributes(params[:post])
        format.html { redirect_to @post, notice: 'Post was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /posts/1
  # DELETE /posts/1.json
  def destroy
    @post = Post.find(params[:id])
    @post.destroy

    respond_to do |format|
      format.html { redirect_to posts_url }
      format.json { head :no_content }
    end
  end

end

查看/客户/ show.html.erb

<div class="posts">
    <%= render 'posts/post'%>
</div>

视图/后/ _post.html.erb

<li>
    <%= @posts.each do |post| %>
        <%= post.title %>
    <% end %>
</li>

这里的输出是什么样的

[]

为什么？

由于

Answer 1

看起来客户没有帖子关联，但只有活动关联。我从那里开始

Answer 2

在我看来，你有一些错误。首先，partial（view / post / _post.html.erb）应该呈现单个帖子，而不是它们的整个集合。第二个问题是你没有传递任何东西给部分。

渲染集合有一个方便的简写，如果你只渲染集合，它会自动查找具有相同名称的部分，并为集合中的每个模型渲染。

请参阅：http://guides.rubyonrails.org/layouts_and_rendering.html#using-partials

所以我认为这应该做你想要的（我添加<ul></ul>标签使其成为无序列表）：

查看/客户/ show.html.erb

<div class="posts">
  <ul>
  <%= render @posts %>
  </ul>
</div>

视图/后/ _post.html.erb

<li>
  <%= post.title %>
</li>

Ruby on Rails协会

2 个答案: