Rails 3:如何创建新的嵌套资源? [英] Rails 3: How to create a new nested resource?

问题描述

Rails 入门指南 掩盖了这一部分，因为它没有实现Comments 控制器的新"操作.在我的应用程序中，我有一个包含许多章节的书籍模型:

The Getting Started Rails Guide kind of glosses over this part since it doesn't implement the "new" action of the Comments controller. In my application, I have a book model that has many chapters:

class Book < ActiveRecord::Base
  has_many :chapters
end

class Chapter < ActiveRecord::Base
  belongs_to :book
end

在我的路由文件中:

resources :books do
  resources :chapters
end

现在我想实现章节控制器的新"操作:

Now I want to implement the "new" action of the Chapters controller:

class ChaptersController < ApplicationController
  respond_to :html, :xml, :json

  # /books/1/chapters/new
  def new
    @chapter = # this is where I'm stuck
    respond_with(@chapter)
  end

这样做的正确方法是什么?另外，视图脚本(表单)应该是什么样的?

What is the right way to do this? Also, What should the view script (form) look like?

推荐答案

首先你必须在你的章节控制器中找到相应的书来为他建立一个章节.你可以这样做:

First you have to find the respective book in your chapters controller to build a chapter for him. You can do your actions like this:

class ChaptersController < ApplicationController
  respond_to :html, :xml, :json

  # /books/1/chapters/new
  def new
    @book = Book.find(params[:book_id])
    @chapter = @book.chapters.build
    respond_with(@chapter)
  end

  def create
    @book = Book.find(params[:book_id])
    @chapter = @book.chapters.build(params[:chapter])
    if @chapter.save
    ...
    end
  end
end

在你的表单中，new.html.erb

In your form, new.html.erb

form_for(@chapter, :url=>book_chapters_path(@book)) do
   .....rest is the same...

或者你可以试试速记

form_for([@book,@chapter]) do
    ...same...

希望这会有所帮助.

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