Question

我的照片模型属于用户模型。每当我尝试访问/users/4/photos/new的新视图时，Rails都会返回此错误：

No route matches {:action=>"index", :controller=>"photos", :user_id=>"4"} missing required keys: [:id]

这是我的 PhotosController ：

class PhotosController < ApplicationController
    def index
        find_user
        @photos = @user.photos
    end

    def new
        find_user
        @photo = @user.photos.build
    end

    def show
        find_photo
    end

    def create
        @photo = Photo.new(params[:photo])

        if @photo.save

            if params[:images]
                params[:images].each { |image|
                    @user.photos.create(image: image)
                }
            end

        else
            render 'new'
        end
    end

    def update
        find_user
        @photo = @user.photos.find(params[:id])

        if @photo.update
            redirect_to photos_path
        else
            render 'edit'
        end
    end

    def destroy
        find_photo
        @photo.destroy

        redirect_to photos_path
    end

    private

    def find_user
        @user = User.find(params[:user_id])
    end

    def find_photo
        @photo = Photo.find(params[:id])
    end

    def photo_params
        require(:photo).permit(:title, :image, :user_id)
    end
end

这是照片视图的 _form 部分。

<%= form_for @photo, :html => { class: 'form-horizontal', multipart: true } do |f| %>
<%= f.label :title %>
<%= f.text_field :title, class: "input-field form-control" %>

<%= f.label :pictures %>
<%= file_field_tag "images[]", type: :file, multiplue: true %>

<%= f.submit nil, class: "btn btn-primary" %>

我不明白ID是如何丢失的，我通过 find_user 方法提供ID。

更新

# routes.rb
Rails.application.routes.draw do

  root 'welcome#index'

  # prevedene rute
  get "/pocetna"          => "welcome#index", as: "index" 
  get "/o-sajtu"          => "welcome#about", as: "about"
  get "/moj-profil"       => "users#show", as: "profile"
  post "/users"         => "users#create"
  get "/users"          => "users#index", as: "users"
  get "/user"           => "users#index"
  get "/users/:id"       => "users#show", as: "user"
  get "/users/:id/edit" => "users#edit", as: "edit_user"
  patch "/users/:id"     => "users#update"
  get "/users/add"    => "users#new", as: "new_user"

  resources :sessions, only: [:new, :create, :destroy]

  get "/login"   => "sessions#new", as: "login"
  post "/login"  => "sessions#create"
  get "/logout"    => "sessions#destroy", as: "logout"
  delete "/logout" => "sessions#destroy"

  resources :users do
    resources :photos
  end
end

更新我现在收到新错误

undefined method `photos_path' for #<<Class:0x007f4f14f16160>:0x00000004f040e8>

表格的第一行已标记。

Answer 1

将_form partial中的form_for更改为

form_for([@user, @photo]) do |f|
#rest of your code
end

Answer 2

如何在视图中调用/ users / 4 / photos / new？理想情况下，您应该将user_id作为id而不是user_id传递。有一次，你应该解决这个问题。

缺少必需的密钥：新照片表单上的ID

2 个答案: