嵌套资源的编辑路径引发错误，缺少必需的键：[：id]

编程问答 2022-06-13

问题描述

我查看了几个不同的类似SO帖子并尝试了解决方案，但是没有一个对我有用，并且我在这个问题上停留了几天。我认为我的应用程序可能还有其他问题导致此问题。

问题： 我需要链接来编辑联系人的地址。我知道路由需要两个ID，但是我无法弄清楚为什么我提供的变量无法像在destroy方法链接中那样提供地址ID。这件作品可能有问题： 或者是我控制器的一种编辑方法中的某些内容。我不知道。感谢您的帮助。对于任何愚蠢的错误表示歉意，我对此很陌生。

错误：

Started GET "/contacts/16/" for ::1 at 2020-09-20 14:02:46 +0200
Processing by ContactsController#show as HTML
  Parameters: {"id"=>"16"}
  Contact Load (13.8ms)  SELECT "contacts".* FROM "contacts" WHERE "contacts"."id" = $1 LIMIT $2  [["id",16],["LIMIT",1]]
  ↳ app/controllers/contacts_controller.rb:8:in `show'
  Rendering contacts/show.html.erb within layouts/application
  Address Load (6.3ms)  SELECT "addresses".* FROM "addresses" WHERE "addresses"."contact_id" = $1  [["contact_id",16]]
  ↳ app/views/contacts/show.html.erb:21
  Rendered contacts/show.html.erb within layouts/application (Duration: 11.3ms | Allocations: 2127)
Completed 500 Internal Server Error in 33ms (ActiveRecord: 20.4ms | Allocations: 3488)

ActionView::Template::Error (No route matches {:action=>"edit",:contact_id=>"16",:controller=>"addresses",:id=>nil},missing required keys: [:id]):
    28:       <td><%= address.zip %></td>
    29:       <td><%= address.state %></td>
    30:       <td><%= address.country %></td>
    31:       <td><%= link_to 'Edit Address',edit_contact_address_path(address.contact,address) %></td>
    32:       <td><%= link_to 'Destroy Address',[address.contact,address],33:                method: :delete,34:                data: { confirm: 'Are you sure?' } %></td>
  
app/views/contacts/show.html.erb:31
app/views/contacts/show.html.erb:21

routes.rb 

Rails.application.routes.draw do
  resources :contacts do
    resources :addresses
  end
  root to: 'welcome#index'
end

models / address.rb 

class Address < ApplicationRecord
  validates :street,:town,:zip,:country,presence: true
  belongs_to :contact
end

models / contact.rb 

class Contact < ApplicationRecord
  has_many :addresses,dependent: :destroy
  validates :first_name,presence: true
  validates :last_name,presence: true
end

views/contacts/show.html/erb 

[...excerpt...]
<% if @contact.addresses.any? %>
<h2>Addresses</h2>
  <% @contact.addresses.each do |address| %>
  <% debug address.id %>
  <table>
  <tr>
      <td><%= address.id %></td>
      <td><%= address.street %></td>
      <td><%= address.town %></td>
      <td><%= address.zip %></td>
      <td><%= address.state %></td>
      <td><%= address.country %></td>
      <td><%= link_to 'Edit Address',address) %></td>
      <td><%= link_to 'Destroy Address',method: :delete,data: { confirm: 'Are you sure?' } %></td>
    </tr>
    <% end %>
<% end %>

controllers/contacts_controller.rb 

class ContactsController < ApplicationController
[...excerpt...]

  def show
    @contact = Contact.find(params[:id])
    @address = @contact.addresses.new
  end

controllers/addresses_controller.rb 

class AddressesController < ApplicationController
[...excerpt...]

  def new
    @contact = Contact.find(params[:contact_id])
    @address = Address.new
  end
  
  def edit
    @contact = Contact.find(params[:contact_id])
    @address = @contact.addresses.find(params[:id])
  end

耙道：

contact_addresses GET    /contacts/:contact_id/addresses(.:format)                                                addresses#index
                                      POST   /contacts/:contact_id/addresses(.:format)                                                addresses#create
                  new_contact_address GET    /contacts/:contact_id/addresses/new(.:format)                                            addresses#new
                 edit_contact_address GET    /contacts/:contact_id/addresses/:id/edit(.:format)                                       addresses#edit
                      contact_address GET    /contacts/:contact_id/addresses/:id(.:format)                                            addresses#show
                                      PATCH  /contacts/:contact_id/addresses/:id(.:format)                                            addresses#update
                                      PUT    /contacts/:contact_id/addresses/:id(.:format)                                            addresses#update
                                      DELETE /contacts/:contact_id/addresses/:id(.:format)                                            addresses#destroy
                             contacts GET    /contacts(.:format)                                                                      contacts#index
                                      POST   /contacts(.:format)                                                                      contacts#create
                          new_contact GET    /contacts/new(.:format)                                                                  contacts#new
                         edit_contact GET    /contacts/:id/edit(.:format)                                                             contacts#edit
                              contact GET    /contacts/:id(.:format)                                                                  contacts#show
                                      PATCH  /contacts/:id(.:format)                                                                  contacts#update
                                      PUT    /contacts/:id(.:format)                                                                  contacts#update
                                      DELETE /contacts/:id(.:format)

解决方法

在使用循环时：

<% @contact.addresses.each do |address| %>我猜address之一缺少id值。

尝试检入Rails控制台：Contact.find(16).addresses.pluck(:id)。我确定您会在结果数组中找到一个nil值。

,

错误从这里开始：

  def show
    @contact = Contact.find(params[:id])
    @address = @contact.addresses.new
  end

调用@contact.addresses.new会创建一个与您的Address绑定的新@contact模型。全新的Address 还没有ID 。即使@contact已保存地址，也要执行此操作。因此，当您开始迭代时：

<% @contact.addresses.each do |address| %>

一旦点击未保存的Address，它将创建一个带有nil ID的链接；单击将不起作用。

删除未使用的@address = @contact.addresses.new行将使页面正常工作，尽管表中还没有任何地址。如果您要进行测试，则始终可以将指向该联系人页面的链接添加到new_contact_address_path(@contact)来创建一个新的链接！

更新：要继续在页面上的表单上使用@address，可以从Address的角度创建它：

@address = Address.new(contact: @contact)

这将为新@address分配您当前的@contact开头，但不会修改@contact的地址列表，这就是您想要的。

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