滑轨的form_for NoMethodError [英] Rails form_for NoMethodError

问题描述

我想生成Rails应用程序中使用雇员再培训局的形式。我不断地得到NoM​​ethodError线路＃我.html.erb文件3。下面是迁移，控制器，所述模型，和所述.html.erb

I am trying to generate a form using erb in a rails application. I am continually getting the NoMethodError for line #3 of my .html.erb file. Below is the migration, the controller, the model, and the .html.erb

该错误是未定义的方法`class_projects_path'

The error is "undefined method `class_projects_path'"

迁移：

class CreateClassProjects < ActiveRecord::Migration  
  def change  
    create_table :class_projects do |t|  
      t.string :name  
      t.text :description  
      t.text :summary  
      t.text :github  
      t.text :other_url  

      t.timestamps  
    end  
  end  
end  

型号：

class ClassProject < ActiveRecord::Base
  attr_accessible :description, :github, :name, :other_url, :summary
end    

控制器：

class ClassProjectsController < ApplicationController
  def new
    @class_project = ClassProject.new
  end
end     

new.html.erb：

new.html.erb:

<h1>New Class Project</h1>

   <%= form_for @class_project do |f| %>

   <%= f.label :name %>
   <%= f.text_field :name %>

   <%= f.label :description %>
   <%= f.text_field :description %>

   <%= f.label :summary %>
   <%= f.text_field :summary %>

   <%= f.label :github %>
   <%= f.text_field :github %>

   <%= f.label :other_url %>
   <%= f.text_field :other_url %>

<% end %>    

路线的好办法：

Route for good measure:

get 'new_project' => 'class_projects#new', :as => 'new'     

感谢您的帮助，inb4学习code要点，使用搜索功能要点，等等。

Thanks for any help, inb4 learn to code nub, use the search function nub, etcetera.

推荐答案

您需要使用以下命令：

#config/routes.rb
resources :class_projects

这意味着你就可以使用以下命令：

This means you'll be able to use the following:

#app/controllers/class_projects_controller.rb
class ClassProjectsController < ApplicationController
   def new
      @class_project = ClassProject.new
   end
end

#app/views/class_projects/new.html.erb
<%= form_for @class_project do |f| %>
   ...
<% end %>

-

路线

您的问题是，你还没有宣布对你的 class_projects 对象路线的完整的恭维。 Rails的运行 足智多谋 （面向对象）的路由系统，这意味着，如果你调用资源指令，你将有一个完整的CRUD路由结构提供了：

The problem you have is that you have not declared a full compliment of routes for your class_projects objects. Rails runs a resourceful (object orientated) routing system, meaning that if you invoke the resources directive, you'll be provided with a full CRUD routing structure:

这意味着，如果你使用的辅助，例如的form_for （其中建立了基于您提供的对象上的路线），你的有无的到有设置路由的这个CRUD恭维。

This means that if you use a helper such as form_for (which builds routes based on your provided object), you'll have to have this CRUD compliment of routes set up.

定义你的路由是上面的文件会给你打电话的的form_for 帮助逍遥法外（没有额外的参数）的能力。

Defining your routes file as above will give you the ability to call the form_for helper with impunity (and no extra arguments)

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