带有自定义路由的ActionController :: ParameterMissing

问题描述

我正在建立一个数字图书馆，现在我正在尝试将soft_delete添加到应用程序中，但是出现显示错误的问题

I am building a digital library, and right now I am currently trying to add soft_delete to an application, but I am having issues with the error showing

soft_delete方法的作用是将数据库中的表从其默认false值更新为true.我已经检查了我的代码，但是找不到问题的根源.

The action of the soft_delete method is to update its table in the database from its default false value to true. I have checked through my code but I cannot find where the issue is from.

图书模型

class Book < ApplicationRecord
  #add a model scope to fetch only non-deleted records
  scope :not_deleted, -> { where(soft_deleted: false) }
  scope :deleted, -> { where(soft_deleted: true) }

  #create the soft delete method
  def soft_delete 
    update(soft_deleted: true)
    soft_deleted
  end

  # make an undelete method
  def undelete
    update(soft_deleted: false)
  end
end

Books Controller(截断)

class BooksController < ApplicationController
  before_action :set_book, only: [:show, :edit, :update, :soft_delete, :destroy]

  def index
    @books = Book.not_deleted
  end

...

  def destroy
    @book.destroy
    respond_to do |format|
      format.html { redirect_to books_url, notice: 'Book was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  def soft_delete
    respond_to do |format|
      @book.soft_delete(book_params)
        format.html { redirect_to books_url, notice: 'Book was successfully deleted.' }
        format.json { head :no_content }
    end
  end



  private
    # Use callbacks to share common setup or constraints between actions.
    def set_book
      @book = Book.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def book_params
      params.require(:book).permit(:name, :author, :description, :soft_deleted)
    end
end

路线

Rails.application.routes.draw do
  resources :books
  put '/books/:id' => 'books#soft_delete'
end

图书索引视图

<h1>Books</h1>
<tbody>
    <% @books.each do |book| %>
      <tr>
        <td><%= book.name %></td>
        <td><%= book.author %></td>
        <td><%= book.description %></td>
        <td><%= link_to 'Show', book %></td>
        <td><%= link_to 'Edit', edit_book_path(book) %></td>
        <td><%= link_to 'Destroy', book, method: :delete, data: { confirm: 'Are you sure?' } %></td>
        <td><%= link_to 'Soft Delete', book, method: :put, data: { confirm: 'Are you sure?' } %></td>
        soft_delete
      </tr>
    <% end %>
  </tbody>

推荐答案

我建议您不要使用诸如put '/books/:id' => 'books#soft_delete'Rails具有成员路线"，因此您可以通过以下方式重写路线:

I suggest you not use explicit routes likeput '/books/:id' => 'books#soft_delete'Rails has 'member routes', so you can rewrite your routes such way:

resources :books, only: %i[index destroy] do
  member { put :soft_delete }
end

在这里，我使用了'only'选项，该选项仅允许您为您定义必要的路线(不是全部7条路线，而是2条-索引并销毁)

Here i've used option 'only' which allows you to define only necessary routes for you (not all 7, but 2 - index and destroy)

首先:您已经定义了resources :books.此定义为您创建了7条路线:

Firstly: you've defined resources :books. This definition creates 7 routes for you:

    books GET    /books(.:format)           -> books#index
          POST   /books(.:format)           -> books#create
 new_book GET    /books/new(.:format)       -> books#new
edit_book GET    /books/:id/edit(.:format)  -> books#edit
     book GET    /books/:id(.:format)       -> books#show
          PATCH  /books/:id(.:format)       -> books#update (this and next route are the same, and considering as 1, so we have 7 routes, not 8)
          PUT    /books/:id(.:format)       -> books#update
          DELETE /books/:id(.:format)       -> books#destroy

因此使用方法PUT和路径'/books/:id'的路由已经存在，并且您的put '/books/:id' => 'books#soft_delete'将永远不会使用.那就是引发错误的原因:'BooksController#update中的'ActionController :: ParameterMissing'-您的链接单击触发了BooksController#update操作调用，该调用需要在参数中输入书本键.

So route with method PUT and path '/books/:id' already present and your put '/books/:id' => 'books#soft_delete' will never be used. That is what triggered error: 'ActionController::ParameterMissing in BooksController#update ' - your link click has triggered BooksController#update action call, which requires book key in the params.

第二:我建议您从模型中删除方法:soft_delete和:undelete. Rails提供方法:切换！可以立即写入数据库，而:toggle可以更改值，而不是立即保存更改.因此，您可以在控制器中直接编写以下代码:

Secondly:I suggest you to remove methods :soft_delete and :undelete from model. Rails provide methods :toggle! for instant writing to the DB and :toggle for changing value and not saving changes immediately . So you can write right in the controller such code:

book = Book.find_by(id: params[:id])
book.toggle!(:soft_deleted)

请注意，soft_deleted列应为布尔值才能使其正常工作.

Note that column soft_deleted should be boolean to make that work.

您的链接应为:

link_to 'Soft Delete', soft_delete_book_path(book), data: { method: :put }

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