72261

Association Ruby on Rails

Question:

I am trying a an simple association which should work. I followed the tutorial at <a href="http://ruby.railstutorial.org/chapters/" rel="nofollow">http://ruby.railstutorial.org/chapters/</a> and at chapter 10

Here what I have wrote down

model/customer

class Customer < ActiveRecord::Base has_many :posts, dependent: :destroy attr_accessible :name, :email, :password, :password_confirmation has_secure_password

model/post

class Post < ActiveRecord::Base belongs_to :customer attr_accessible :description, :post_finish_at, :post_how, :post_location

controller/customers

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 ...

controller/post -- should be irrelevant since i am doing a partial class PostsController < ApplicationController

# 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

view/customer/show.html.erb

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

view/post/_post.html.erb

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

Here what the output look like

<ul><li>[]</li> </ul>

Why?

Thanks

Answer1:

It looks to me like you've got a couple things wrong. First, the partial (view/post/_post.html.erb) should be rendering a single post, not the whole collection of them. Second problem is that you're not passing anything to the partial.

There's a handy shorthand for rendering collections, where if you just render the collection, it will automatically look for a partial with the same name and render it for each model in the collection.

See: <a href="http://guides.rubyonrails.org/layouts_and_rendering.html#using-partials" rel="nofollow">http://guides.rubyonrails.org/layouts_and_rendering.html#using-partials</a>

So I think this should do what you want (I added <ul></ul> tags to make it an unordered list):

view/customer/show.html.erb

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

view/post/_post.html.erb

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

Answer2:

It looks like customer doesn't have a posts association, but only an events association. I'd start there

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