Rails Devise在控制器中访问current_user的问题

Question

我正在使用Devise进行身份验证的Rails和Angular应用程序上工作。 我在控制器的index操作中访问current_user时遇到问题。

我需要显示属于特定用户的列表。

class ListsController < ApplicationController
  respond_to :json
  before_filter :authenticate_user!

  def index
    respond_with current_user.List.all
  end

  def create
    respond_with List.create(list_params.merge(user_id: current_user.id))
  end

 end

当我转到索引时，这将返回一个无方法错误：

Started POST "/users/sign_in.json" for ::1 at 2015-05-22 18:08:20 -0400
Processing by Devise::SessionsController#create as JSON
  Parameters: {"user"=>{}, "session"=>{"user"=>{}}}
  User Load (0.5ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
Completed 201 Created in 37ms (Views: 1.5ms | ActiveRecord: 2.9ms)


Started POST "/users/sign_in.json" for ::1 at 2015-05-22 18:08:20 -0400
Processing by Devise::SessionsController#create as JSON
  Parameters: {"user"=>{}, "session"=>{"user"=>{}}}
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
Completed 201 Created in 14ms (Views: 1.6ms | ActiveRecord: 0.3ms)


Started GET "/lists.json" for ::1 at 2015-05-22 18:08:20 -0400
Processing by ListsController#index as JSON
  User Load (1.0ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
Completed 500 Internal Server Error in 7ms

NoMethodError (undefined method `List' for #<User:0x007fdb5bc37a10>):
  app/controllers/lists_controller.rb:6:in `index'

如果将“ index”操作更改为List.all，它将返回所有用户的列表。 我只需要访问特定用户的列表。

这是我的列表模型：

class List < ActiveRecord::Base
    belongs_to :user
    has_many :words, dependent: :delete_all

    def as_json(options = {})
        super(options.merge(include: :words))
    end
end

Answer 1

您应该使用小写的名称list 。 按照约定， List （大写字母）-是类的名称（最终在您的情况下是模型），而不是属性的名称。

还请注意，如果用户模型与列表模型相关联，则可以像

# if there is a like in user.rb
has_many :lists

# you can use in your controller
current_user.lists

指定关联记录时，不需要all 。 这是指南