如何为嵌套路径制作表格？答案

【问题标题】：how to make a form for nested paths?如何为嵌套路径制作表格？
【发布时间】：2015-07-26 03:14:15
【问题描述】：

请帮助解决问题。我有嵌套路线：

  resources :users do
    resources :albums
  end

型号：

class User < ActiveRecord::Base
  devise  :database_authenticatable, 
          :registerable,
          :recoverable, 
          :rememberable, 
          :trackable, 
          :validatable

  has_many :albums  
end

class Album < ActiveRecord::Base
  belongs_to :user
end

相册控制器：

  def new
    @album = Album.new
  end

  def create
    @album = Album.new(album_params)

    respond_to do |format|
      if @album.save
        format.html { redirect_to @album, notice: 'Album was successfully created.' }
        format.json { render :show, status: :created, location: @album }
      else
        format.html { render :new }
        format.json { render json: @album.errors, status: :unprocessable_entity }
      end
    end
  end

  def set_album
    @album = Album.find(params[:id])
  end

视图/相册/new.html.erb：

<%= form_for [@user, @album] do |f| %>
  <%= f.text_area :album %>
  <%= f.submit %>
<% end %>

路线：

........
..........
             user_albums GET    /users/:user_id/albums(.:format)          albums#index
                         POST   /users/:user_id/albums(.:format)          albums#create
          new_user_album GET    /users/:user_id/albums/new(.:format)      albums#new
         edit_user_album GET    /users/:user_id/albums/:id/edit(.:format) albums#edit
              user_album GET    /users/:user_id/albums/:id(.:format)      albums#show
                         PATCH  /users/:user_id/albums/:id(.:format)      albums#update
                         PUT    /users/:user_id/albums/:id(.:format)      albums#update
                         DELETE /users/:user_id/albums/:id(.:format)      albums#destroy
                   users GET    /users(.:format)                          users#index
                         POST   /users(.:format)                          users#create
                new_user GET    /users/new(.:format)                      users#new
               edit_user GET    /users/:id/edit(.:format)                 users#edit
                    user GET    /users/:id(.:format)                      users#show
                         PATCH  /users/:id(.:format)                      users#update
                         PUT    /users/:id(.:format)                      users#update
                         DELETE /users/:id(.:format)                      users#destroy
............
..........

结果我得到以下错误消息：

相册中的 NoMethodError#new 显示 /home/kalinin/rails/phs/app/views/albums/_form.html.erb 其中第 1 行提出：未定义的方法 `albums_path' 用于

请帮忙制作新表格

【问题讨论】：

标签： ruby-on-rails ruby-on-rails-4

【解决方案1】：

未定义的方法`albums_path'

这个错误是因为你没有在你的控制器new方法中初始化@user，所以@user是nil。所以 Rails 将其视为<%= form_for @album %>，因为没有albums_path，所以会触发该错误。

试试

<%= form_for [current_user, @album] do |f| %>

【讨论】：