0

我正在尝试关注Ryan Bates 截屏视频,但收到一条错误消息。我做了以下事情:

1) 创建表

class CreateComments < ActiveRecord::Migration
  def self.up
    create_table :comments do |t|
      t.references :commentable, :polymorphic => true

2) 设置模型

class Comment < ActiveRecord::Base
  belongs_to :commentable, :polymorphic => true

class Product < ActiveRecord::Base
  has_and_belongs_to_many :categories
  has_many :comments, :as => :commentable

class Category < ActiveRecord::Base
  has_and_belongs_to_many :products
  has_many :comments, :as => :commentable

3)更改控制器显示动作

class CategoriesController < ApplicationController
  def show
    @category = Category.find_by_permalink(params[:id])
    @commentable = @category
    @comment = Comment.new(:commentable => @category)
  end

4) 向模板views/categories/show.html.erb 添加表单

<% form_for [@commentable, Comment.new] do |f| %>
  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
  <p>
    <%= f.label :content %><br />
    <%= f.text_area :content %>
  </p>
  <p>
    <%= f.submit 'Submit' %>
  </p>
<% end %>

5) 之后我通过访问 /categories/my-category-permalink 收到错误消息

NoMethodError in Categories#show
undefined method `category_comments_path' for #<ActionView::Base:0x69a9254>

你能帮我理解我做错了什么吗?在原始截屏视频中,Ryan 使用嵌套关联通过 /categories/permalink/comments 访问评论,但我不需要。我想直接从我的多态对象中写评论。谢谢

4

1 回答 1

1

问题出在路线设置中。我想既然我不使用嵌套资源,我可以保持路由不变。好吧,现在我知道我错了...... :) 添加这个来解决问题:

map.resources :categories :has_many => :comments
map.resources :products, :has_many => :comments
于 2009-09-26T23:22:14.773 回答