Rails where.not 跳过一些记录

Question

我尝试获取除类别 [20,21,22] 以外的所有视频

这是我的查询

@cc = Video.joins(:categories).where.not(categories: { id: [20,21,22]})

但是当我这样做时 @cc.find(113).categories 我明白了

#<ActiveRecord::Associations::CollectionProxy 
[#<Category id: 21, title: "music">, #<Category id: 22, title: "movies">,
#<Category id: 28, title: "collage">]>

我做错了什么？

Answer 1

试试这个：

array = [21,22,23]
@cc = Video.joins(:categories).where("category.id not in (?)", array)

编辑

我想我发现了问题。假设您的 Video 模型与 Category 处于 has_many 关系。所以你应该这样做：

class Video < ActiveRecord::Base
  has_many :categories
  has_many :excluded, -> (array) { where("id not in (?)", array) }, class_name: 'Category'
end

你这样称呼它：

Video.find(113).excluded([21,22,23])

Answer 2

试试这个，

@cc = Video.includes(:categories).references(:categories).where.not(categories: { id: [20,21,22]})

参考， https://robots.thoughtbot.com/activerecords-wherenot

Answer 3

您查询错误。尝试：

Video.where.not(id: Video.joins(:categories).where(categories: { id: [20,21,22]}).pluck(:id))

Rails where.not 跳过一些记录

Rails where.not skips some records

activerecord

join

ruby-on-rails

associations

ruby-on-rails-4