Question

我想要完成的是在我的视图中创建POST和DELETE链接，例如，像一个类似的按钮。

我在我的用户模型（user.rb）中创建了一个方法（def喜欢），该方法将检查用户是否喜欢书签，并显示＆＃39;不像＆＃39;或者＆＃39;喜欢＆＃39;按钮，分别基于我喜欢的方法的响应。

我有以下代码：

routes.rb中：

Rails.application.routes.draw do

  resources :topics do
    resources :bookmarks do
      resources :likes, only: [:create, :destroy]
    end
  end

  devise_for :users

  get 'welcome/index'
  get 'welcome/about'

  root to: 'welcome#index'

  post :incoming, to: 'incoming#create'
end

User.rb：

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :confirmable

  has_many :topics, dependent: :destroy
  has_many :bookmarks, dependent: :destroy
  has_many :likes, dependent: :destroy

  def admin?
    role == 'admin'
  end

  def moderator?
    role == 'moderator'
  end

  def liked(bookmark)
    likes.where(bookmark_id: bookmark.id).first
  end

end

likes_controller.rb：

class LikesController < ApplicationController

  def create
    @bookmark = Bookmark.find(params[:bookmark_id])
    like = current_user.likes.build(bookmark: @bookmark)

    if like.save
      flash[:notice] = "Bookmark was Liked!"
      redirect_to [@bookmark.topic, @bookmark]
    else
      flash[:error] = "Unable to Like Bookmark"
      redirect_to @bookmark
    end
  end

  def destroy
    @bookmark = Bookmark.find(params[:bookmark_id])
    like = current_user.likes.find(params[:id])

    if like.destroy
      flash[:notice] = "Bookmark was Un-liked."
      redirect_to [@bookmark.topic, @bookmark]
    else
      flash[:error] = "Error Un-liking bookmark."
      redirect_to [@bookmark.topic, @bookmark]
    end
  end

end

最后我喜欢偏爱，_like.html.erb：

<div>
  <% if like = current_user.liked(bookmark) %>
    <%= link_to [bookmark, like], class: 'btn btn-danger', method: :delete do %>
      <i class="glyphicon glyphicon-star-empty"> </i>&nbsp; Unlike
    <% end %>
  <% else %>
    <%= link_to [bookmark, Like.new], class: 'btn btn-primary', method: :post do %>
      <i class="glyphicon glyphicon-star"> </i>&nbsp; Like
    <% end %>
  <% end %>
</div>

我想在我的主题中使用#index view：

<h2 id="page-title">All Bookmarks</h2>

<div class="row">
  <div class="col-md-8">
    <% @topics.each do |topic| %>
      <h4><%= link_to "##{topic.title}", topic_path(topic.id) %></br></h4>
      <% topic.bookmarks.each do |bookmark| %>
        <%= render partial: 'likes/like', locals: { bookmark: bookmark } %>
        <%= link_to "#{bookmark.url}", "http://#{bookmark.url}", target: "_blank" %></br>
      <% end %>
    <% end %>
  </div>
  <div class="col-md-4">
    <%= link_to "New Topic", new_topic_path, class: 'btn btn-primary' %>
  </div>
</div>

当我运行服务器并转到索引视图时，收到以下NoMethodError：

未定义的方法`bookmark_likes_path＆＃39;对于＃＆lt;＃：0x007ffe2817b5a0＆gt;

指向这一行：

<%= link_to [bookmark, Like.new], class: 'btn btn-primary', method: :post do %>

哪个位于我喜欢的部分（_like.html.erb）

我认为问题是路由问题，因为据我所知，问题是说bookmark_likes_path方法是nil，如果我检查我的rake路由，我会得到以下内容:(使用grep）

topic_bookmark_likes POST   /topics/:topic_id/bookmarks/:bookmark_id/likes(.:format)     likes#create
     topic_bookmark_like DELETE /topics/:topic_id/bookmarks/:bookmark_id/likes/:id(.:format) likes#destroy

这表示我喜欢的路由，它表示（因为是嵌套资源）访问POST和DELETE操作的正确路由，这些操作位于主题内，因此路径需要是/ topics /：topic_id / bookmarks / ：bookmark_id /喜欢用于创建，和/ topics /：topic_id / bookmarks /：bookmark_id / likes /：id用于删除，所以我更新了喜欢这样的部分：

<div>
  <% if like = current_user.liked(bookmark) %>
    <%= link_to [@topic, bookmark, like], class: 'btn btn-danger', method: :delete do %>
      <i class="glyphicon glyphicon-star-empty"> </i>&nbsp; Unlike
    <% end %>
  <% else %>
    <%= link_to [@topic, bookmark, Like.new], class: 'btn btn-primary', method: :post do %>
      <i class="glyphicon glyphicon-star"> </i>&nbsp; Like
    <% end %>
  <% end %>
</div>

仍然是同样的错误。我已经尝试长时间调试此错误，但我无法修复它，我需要一些帮助。

提前致谢！

Answer 1

我已经修好了。

问题在于嵌套资源确实，我所做的就是将资源分开：

  resources :topics do
    resources :bookmarks
  end

  resources :bookmarks do
    resources :likes, only: [:create, :destroy]
  end

这解决了这个问题，所以我不必为了深入了解细节而烦恼。

嵌套资源中路由的未定义方法

1 个答案: