Question

对铁杆来说是新的，而这个是踢我的屁股。

我的应用设置为Collections =＆gt; Lists =＆gt;链接。

集合

have_many :lists
belongs_to :user

解释

have_many :links
belongs_to :collection

链接

belongs_to :list

收藏控制器

class CollectionsController < ApplicationController

def index
    @user = User.find(current_user)
    @collection = Collection.where(:user_id => current_user.id)
end

def new
    @collection = Collection.new
end

def show
    @collection = Collection.find(params[:id])
    # render :text => CGI.escapeHTML(@collection.inspect)
    redirect_to_good_slug(@collection) and return if bad_slug?(@collection)
end

def create
    @collection = Collection.new(collection_params)
    @collection.user_id = current_user.id
    # render :text => CGI.escapeHTML(@collection.inspect)
    if @collection.save
        redirect_to root_path(@user)
    else
        render 'new'
    end
end

def edit
    @collection = Collection.find(params[:id])
end

def update
    if @collection.update(collection_params)
        redirect_to root_path(@user)
    else
        render 'edit'
    end
end

def destroy
    @collection.destroy
    # redirect_to root_path(@user)
end

private
  def collection_params
    params.require(:collection).permit(:alias, :notes, :visibility)
  end
  def find_collection
    @collection = @user.collection.find(params[:id])
  end
end

列出控制器

class ListsController < ApplicationController
before_filter :find_collection, only: [:new, :create, :destroy, :edit, :update]

def new
  @collection = Collection.find(params[:collection_id])
end

def create
  @list = @collection.lists.build(list_params)
  @list.save!
  respond_to do |format|
        format.html {root_path(@collection.id)}
        format.js
    end
end

def edit
    @list = List.find(params[:id])
    respond_to do |format|
        format.html {root_path(@collection.id)}
        format.js
    end
end

def update
    @list = List.find(params[:id])
    if @list.update(list_params)
        redirect_to collection_path(@collection.id)
    else
        render 'edit'
    end
end

def destroy
    @list = List.find(params[:id])
    @list.destroy
    respond_to do |format|
        format.html {redirect_to collection_path(@collection.id)}
        format.js
    end
end

private
    def list_params
        params.require(:list).permit(:alias)
    end
    def find_collection
        @collection = Collection.find(params[:collection_id])
    end

end

现在，在集合的show视图中，我有一个循环

<%= @collection.lists.each do |list| %>

这是抓住馆藏中的所有列表，效果很好。我试图在这里嵌套另一个循环，抓住每个列表的所有链接。

链接控制器

class LinksController < ApplicationController
before_filter :find_list, only: [:new, :create, :destroy, :edit, :update]

def new
    @list = List.find(params[:list_id])
end

def create
  @link = @collection.list.links.build(link_params)
  @link.save!
  respond_to do |format|
        format.html {root_path(@list.id)}
        format.js
    end
end

def edit
    @list = List.find(params[:id])
    @link = Link.find(params[:id])
    respond_to do |format|
        format.html {root_path(@list.id)}
        format.js
    end
end

def update
    @list = List.find(params[:id])
    @link = Link.find(params[:id])
    if @link.update(link_params)
        redirect_to list_path(@list.id)
    else
        render 'edit'
    end
end

def destroy
    @list = List.find(params[:id])
    @link = Link.find(params[:id])
    @link.destroy
    respond_to do |format|
        format.html {redirect_to list_path(@list.id)}
        format.js
    end
end

private
    def link_params
        params.require(:link).permit(:url)
    end
    def find_list
        @list = List.find(params[:list_id])
    end
end

我尝试像这样循环..

<%= @list.links.each do |link| %>

和

<%= @collection.lists.links.each do |link| %>

和

<%= @collection.list.links.each do |link| %>

并且它不会为nil：class抛出任何方法。

我的路线看起来像..

devise_scope :user do
authenticated :user do
  root 'collections#index', as: :authenticated
   resources :collections do
    resources :lists
  end
      resources :lists do
      resources :links
  end
end

我认为我在ORM方面表现不错，但我对后端的所有人都很陌生，任何帮助都会非常感激。

Answer 1

当您迭代@collection.lists时，您正在使用块变量list，它引用特定的list实例。要获取列表的所有链接，您应该使用变量list，如下所示：

<%= @collection.lists.each do |list| %>  <%# Notice block variable |list| %>
  <%= list.links.each do |link| %>
  ...
  <% end %>
<% end %>

嵌套资源，ORM问题

1 个答案: