將數據添加到嵌套的模型導軌4.0

Question

新的導軌，無法弄清楚如何做到這一點。我已經實現了使用設計的用戶登錄系統，我試圖讓用戶創建多個「列表」。有點像craigslist類型的網站。我可以從軌道控制檯填充數據庫，但我不知道如何把它放在網站上。

我有以下型號：

listing.rb

class Listing < ActiveRecord::Base 
    belongs_to :user 
    default_scope -> { order('created_at DESC') } 

    #add validations 

    validates :user_id, presence: true 
end 

user.rb（用色器件）

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

我想創建一個網頁，其中允許用戶創建一個新的列表。我不確定如何去做這件事。這是我目前有：

listings_controller.rb

class ListingsController < ApplicationController 

    def index 
    @users = User.all 
    end 

    def show 
    @listing = Listing.find(params[:id]) 
    end 

    def new 
    @listing = Listing.new 
    end 

    def create 
    @listing = Listing.new(listing_params) 
    if @listing.save 
     flash[:success] = "Success" 
     redirect_to @listing 
    else 
    render 'new' 
    end 
    end 

private 

    def listing_params 
    params.require(:listing).permit(:id, :user_id, :title, :general_info) 
    end 

end 

模型/視圖/列表/ new.html.erb

<h1> POST A NEW LISTING </h> 

    <%= form_for @listing do |f| %> 
     Title: <%= f.text_field :title %> <br /> 
     General Info: <%= f.text_field :general_info %> <br /> 

     <%= f.submit %> 
    <% end %> 

我一直都在做這個相當長一段時間沒有運氣得到數據庫來填充。目前，表單一旦提交，就會在def create中創建「else」並只呈現相同的頁面。

這裏是日誌輸出，當我運行此：

Started POST "/listings" for 127.0.0.1 at 2013-07-04 17:37:53 -0600 
Processing by ListingsController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"mlyDb24OMQkniOCFQ1JTvzxjplHk7kMgzEBEFBH8hGw=", "listing"=>{"title"=>"title should go here", "general_info"=>"hope this works"}, "commit"=>"Create Listing"} 
    [1m[35m (0.1ms)[0m begin transaction 
    [1m[36m (0.1ms)[0m [1mrollback transaction[0m 
    [1m[35mUser Load (0.3ms)[0m SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1 
    Rendered listings/new.html.erb within layouts/application (4.4ms) 
Completed 200 OK in 17ms (Views: 10.4ms | ActiveRecord: 0.5ms) 

Answer 1

下了這對任何人誰過這個問題來工作：

在routes.db我把列表中的塊：

resources :users do 
     resource :listings 
    end 

對於新/顯示/創建我就確定搜索用戶第一（注意，因爲我使用的設計的current_user.id）方法

def show 
    @listing = Listing.find(current_user.id) 
    end 

    def new 
    @user = User.find(current_user.id) 
    @listing = @user.listings.build 
    end 

    def create 
    @user = User.find(current_user.id) 
    @listing = @user.listings.build(listing_params) 

    if @listing.save 
     flash[:success] = "Success" 
     redirect_to root_path 
    else 
    render :action => 'new' 
    end 

    end 

然後最後，改變了的form_for在new.html.erb這樣：

<%= form_for [@user, @listing] do |f| %> 
    <%= f.label :title, 'Title' %> <br /> 
    <%= f.text_field :title %> 

    ... 

    <%= f.submit "submit" %> 
<% end %>