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Rails 5嵌套资源URL具有多个直通关联

ruby-on-rails-5 ruby ruby-on-rails

Charles Smith · 技术社区 · 8 年前

我已经创建了一个小的测试应用程序,利用有很多通过关联的方法,但我似乎可以得到 link_to

错误消息

No route matches {:action=>"show", :controller=>"categories", :location_id=>#<Category id: 1, name: "parties", created_at: "2017-11-01 17:40:25", updated_at: "2017-11-01 17:40:25">}, missing required keys: [:id]

class Location < ApplicationRecord
  belongs_to :product
  belongs_to :category
end

类别rb型

class Category < ApplicationRecord
  has_many :locations
  has_many :products, through: :locations
end

产品rb型

class Product < ApplicationRecord
  has_many :locations
  has_many :categories, through: :locations
end

路线。rb型

Rails.application.routes.draw do
  resources :locations do
    resources :categories do
      resources :products
    end
  end
  root :to => 'locations#index'
end

类别/索引。html

...
<% @categories.each do |category| %>
   <tr>
     <td><%= category.name %></td>
     <td><%= link_to 'Show', location_category_path(category) %></td>
     <td><%= link_to 'Edit', edit_location_category_path(category) %></td>
     <td><%= link_to 'Destroy', location_categories_path(category), method: :delete, data: { confirm: 'Are you sure?' } %></td>
   </tr>
<% end %>
...

127.0.0.1:3000/轨道/信息/路线

location_category_products_path GET /locations/:location_id/categories/:category_id/products(.:format)  
products#index

POST    /locations/:location_id/categories/:category_id/products(.:format)  
products#create

new_location_category_product_path  GET /locations/:location_id/categories/:category_id/products/new(.:format)  
products#new

edit_location_category_product_path GET /locations/:location_id/categories/:category_id/products/:id/edit(.:format) 
products#edit

location_category_product_path  GET /locations/:location_id/categories/:category_id/products/:id(.:format)  
products#show

PATCH   /locations/:location_id/categories/:category_id/products/:id(.:format)  
products#update

PUT /locations/:location_id/categories/:category_id/products/:id(.:format)  
products#update

DELETE  /locations/:location_id/categories/:category_id/products/:id(.:format)  
products#destroy

location_categories_path    GET /locations/:location_id/categories(.:format)    
categories#index

POST    /locations/:location_id/categories(.:format)    
categories#create

new_location_category_path  GET /locations/:location_id/categories/new(.:format)    
categories#new

edit_location_category_path GET /locations/:location_id/categories/:id/edit(.:format)   
categories#edit

location_category_path  GET /locations/:location_id/categories/:id(.:format)    
categories#show

PATCH   /locations/:location_id/categories/:id(.:format)    
categories#update

PUT /locations/:location_id/categories/:id(.:format)    
categories#update

DELETE  /locations/:location_id/categories/:id(.:format)    
categories#destroy

locations_path  GET /locations(.:format)    
locations#index

POST    /locations(.:format)    
locations#create

new_location_path   GET /locations/new(.:format)    
locations#new

edit_location_path  GET /locations/:id/edit(.:format)   
locations#edit

location_path   GET /locations/:id(.:format)    
locations#show

PATCH   /locations/:id(.:format)    
locations#update

PUT /locations/:id(.:format)    
locations#update

DELETE  /locations/:id(.:format)    
locations#destroy

root_path   GET /   
locations#index

3 回复 | 直到 8 年前

Cyzanfar 8 年前

对于路线:

location_category_path  GET /locations/:location_id/categories/:id(.:format)

<!-- /locations/:location_id/categories/:id -->
<%= link_to 'Show', [{location_id}, {category_id}] %>

Arslan Ali 8 年前

location_category_path  GET /locations/:location_id/categories/:id(.:format)

如您所见,路线: location_category_path 需要两件事: :location_id & :id (the id 您要引用的类别)。

在您的例子中,您只指定了一个,而不是另一个。您还需要指定 :location\u id .

还有一种较短的方法可以编写此URL: [location_id, category_id] . 只需编写一个以两个ID开头的数组 location_id .

-1

Jay-Ar Polidario 8 年前

再加上阿尔斯兰的回答。

您可能需要设置 @location 在控制器中,如果您还没有。

应用程序/控制器/类别_控制器。rb型

class CategoriesController < ApplicationController
  def index
    @location = # your code here
  end
end

应用程序/视图/类别/索引。html。erb公司

<% @categories.each do |category| %>
   <tr>
     <td><%= category.name %></td>
     <td><%= link_to 'Show', location_category_path(@location.id, category.id) %></td>
     <td><%= link_to 'Edit', edit_location_category_path(@location.id, category.id) %></td>
     <td><%= link_to 'Destroy', location_categories_path(@location.id, category.id), method: :delete, data: { confirm: 'Are you sure?' } %></td>
   </tr>
<% end %>

对于路由URL参数,您可以使用:

location_category_path(@location.id, category.id)

:location_id 然后 :id )当你这么做的时候 bundle exec rake routes ,也可以具体如下:

location_category_path(location_id: @location.id, id: category.id)