Question

对rails很新，无法弄清楚如何做到这一点。我已经使用设计实现了用户登录系统，我试图让用户创建多个“列表”。有点像craigslist类型的网站。我可以从rails控制台填充数据库，但我无法弄清楚如何将它放在网站上。

我有以下型号：

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（使用设计）

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

我正在尝试创建一个允许用户创建新列表的页面。我不确定如何去做这件事。这就是我目前所拥有的：

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/视图/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 %>

我已经在这方面工作了很长一段时间没有运气让数据库填充。目前，表单一旦提交就会在def创建中点击“else”，只是呈现相同的页面。

这是我运行时的日志输出：

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

以下内容适用于遇到此问题的任何人：

在routes.db中，我将列表放在一个块中：

 resources :users do
      resource :listings
  end

对于新的/ show / create方法，我确保首先搜索用户（请注意，因为我正在使用设计current_user.id）

  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

然后最后，将new.html.erb中的form_for更改为：

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

  ...

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

将数据添加到嵌套模型轨道4.0

1 个答案: