Question

我在rails noob上使用 form_for 删除资源时出现问题。

我正在尝试为用户可以将同一产品的多个实例添加到其列表中的产品创建愿望清单。我没有为列表中的每个产品创建唯一的数据库条目（无论列表中是否已有相同的产品），而是包含了一个计数器列，＆＃39; row，＆＃39;当用户将同一产品的倍数添加到他或她的愿望清单时，这会增加。通过相同的逻辑，我希望删除操作首先减少此计数器，直到它达到0，然后从数据库中删除该项。

以下是我所拥有的：

错误消息：

 No route matches [DELETE] "/wish"
 Routes

 Routes match in priority from top to bottom

 wishes_path        GET     /wishes(.:format)           wishes#index
                    POST    /wishes(.:format)           wishes#create 
 new_wish_path      GET     /wishes/new(.:format)       wishes#new
 edit_wish_path     GET     /wishes/:id/edit(.:format)  wishes#edit
 wish_path          GET     /wishes/:id(.:format)       wishes#show
                    PATCH   /wishes/:id(.:format)       wishes#update
                    PUT     /wishes/:id(.:format)       wishes#update
                    DELETE  /wishes/:id(.:format)       wishes#destroy

希望/ index.html.erb

<div class="wishes_body">
  <h2>Your Wish-List</h2>

  <table>
    <thead>
      <tr>
        <th class="field-label col-md-2 active">
          <label>Name</label>
        </th>
        <th class="col-md-3">Description</th>
        <th class="col-md-1">Amount</th>
        <th class="col-md-1">Number</th>
        <th class="col-md-2">Total</th>
        <th colspan="3" class="col-md-3">Remove</th>
      </tr>
    </thead>

    <tbody>
        <% @wishes.all.each do |w| %>
            <%= render partial: 'wish', object: w %>
        <% end %>
    </tbody>
  </table>
</div>

_wish.html.erb

<tr>
  <td class="field-label col-md-2 active">
    <label><%= wish.product.name %></label>
  </td>
  <td class="col-md-3"><%= wish.product.description %></td>
  <td class="col-md-1"><%= '%.2f' % (wish.product.amount/100.00) %></td>
  <td class="col-md-1"><%= wish.total %></td>
  <td class="col-md-2"><%= '%.2f' % ((wish.product.amount/100.00) * wish.total) %></td>
  <%= form for(wish_path(wish), :html => { method: 'delete' }) do %>
    <td><%= f.label(:i, "How many:") %></td>
    <td><%= f.number_field(:i) %></td>
    <td><%= f.submit :value => "Remove" %></td>
  <% end %>
</tr>

控制器/ wishes.controller.rb

class WishesController < ApplicationController

    def index
        @wishes = Wish.where("user_id = ?", "#{current_user.id}")
    end

    def show
        @user = current_user
        @products = @user.wish_list.products.order("created_at DESC")
    end

    def create
        @product = Product.find(params[:product_id])
        if Wish.where(user_id: "#{current_user.id}", product_id: "#{@product.id}").exists?
            @wish = Wish.where(user_id: "#{current_user.id}", product_id: "#{@product.id}").first
            @wish.total += 1

        else
            @wish = @product.wishes.new
            @wish.user = current_user
            @wish.total = 1
        end
        respond_to do |format|
            if @wish.save
                format.html { redirect_to action: "index", notice: 'You have added <%= @wish.product %> to your wish list.' }
                format.json { render :index, status: :created }
            else
                format.html { redirect_to @product, alert: 'Wish was not created succesfully.' }
                format.json { render json: @wish.errors, status: :unprocessable_entity }
            end
        end
    end

    def destroy
        case i = params[:i]
        when @wish.total > i
            @wish.total -= i
            respond_to do |format|
                format.html { redirect_to action: 'index', notice: 'You removed the item from your wish-list.' }
                format.json { head :no_content }
            end
        when @wish.total == i
            @wish.destroy
            respond_to do |format|
                format.html { redirect_to action: 'index', notice: 'You removed the item from your wish-list.' }
                format.json { head :no_content }
            end
        else
            format.html { redirect_to action: 'index', alert: 'You cannot remove more items than you have on your list.' }
            format.json { head :no_content }
        end

    end
end

config.routes.rb

Rails.application.routes.draw do

  root 'static_pages#index'

  get 'static_pages/about'

  get 'static_pages/contact'

  get 'static_pages/landing_page'

  post 'static_pages/thank_you'

  resources :orders, only: [:index, :show, :new, :create]

  resources :users

  devise_for :users, :controllers => { :registrations => "my_devise/registrations" }, 
                     :path => '', :path_names => {:sign_in => 'login', :sign_out => 'logout', :sign_up => 'register'}

  resources :wishes

  resources :products do
    resources :comments
  end

  resources :payments
end

Answer 1

您应该使用form_tag而不是form_for来实现此目的，因为您不会在表单中使用@wish资源：

<%= form_tag wish_url(wish), method: :delete do %>

等

Rails路由错误：没有路由匹配[DELETE]

1 个答案: