Question

我正在做一个待办事项清单，在这里我可以有多个执行不同任务的清单。我的主要问题是当我尝试创建收藏夹功能时，可以在其中将列表添加到收藏夹列表中。

列表模型

class List < ApplicationRecord
  belongs_to :user
  has_many :tasks
  has_many :favorites

  has_many :favoriters, through: :favorites, foreign_key: :user_id

  accepts_nested_attributes_for :tasks, allow_destroy: true
end

收藏夹模型

class Favorite < ApplicationRecord
 belongs_to :list
 belongs_to :user
end

用户模型

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

  has_many :lists
  has_many :favorites

  has_many :favorite_lists, through: :favorites
end

列表控制器：

def favorites
 @list = List.find(params[:list_id])
 current_user.favorites << @list
 redirect_to lists_path, notice: 'Added to Favorite List'
end

路线：

resources :lists do
  resources :tasks, only: [:index, :new, :create]
  post :favorites
end

在我的节目列表视图中的链接：

<%= link_to "Favorite", list_favorites_path(@list), method: :post %>

消息错误：

Favorite(#70365311619800) expected, got #<List id: 1, user_id: 1, public: true, created_at: "2019-05-02 00:43:05", updated_at: "2019-05-02 00:43:05", title: "teste", favorite: nil> which is an instance of List(#70365317909860)

我在这里想念什么？

Answer 1

我相信这里：

def favorites
 @list = List.find(params[:list_id])
 current_user.favorites << @list
 redirect_to lists_path, notice: 'Added to Favorite List'
end

您想要的：

def favorites
 @list = List.find(params[:list_id])
 current_user.favorite_lists << @list
 redirect_to lists_path, notice: 'Added to Favorite List'
end

我相信您也必须在此处更改has_many :favorite_lists, through: :favorites

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

  has_many :lists
  has_many :favorites

  has_many :favorite_lists, through: :favorites
end

因为Favorite没有favorite_list_id，所以它有list_id。像这样：

has_many :favorite_lists, through: :favorites, source: :list

收藏列表功能期间发生错误（预期一件事，另有一件事）

1 个答案: