如何在rails控制台显示所有关联集合？

Question

我想在rails控制台中显示parent实体“文章”的所有集合，这将是它们之间的关系，示例：

# article.rb

class Article < ActiveRecord::Base
 belongs_to :parent, :class_name => 'Article', optional: true
 has_many :sub_articles, :class_name => 'Article', :foreign_key => 'parent_id'
end

现在我拥有的是：

irb(main):095:0> Article.find(1)
Article Load (0.9ms)  SELECT "articles".* FROM "articles" ORDER BY 
"articles"."id" ASC LIMIT   [["LIMIT", 1]]
=> 
#<Articles:0x0000264231faa292

id: 1,
name: "king article"
created_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
updated_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
parent_id: nil

我想在 rails 控制台上显示的内容：

id: 1,
name: "king article"
created_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
updated_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
parent_id: nil
sub_articles:

[ Article:0x0000641428defb71
id: 2,
  name: "pencils article"
  created_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
  updated_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
  parent_id: 1
  sub_articles:
    [ Article:0x0000621438defb71
    id: 3,
    name: "pencil child 1"
    created_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
    updated_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
    parent_id: 2
    sub_articles: [],

    id: 4,
    name: "pencil child 2"
    created_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
    updated_at: Fri, 13 Aug 2021 13:14:26.463429000 UTC +00:00,
    parent_id: 2
    sub_articles: []
  ]

]

最终我要寻找的是是否咨询 parent 以显示他们的 children（如果可能的话 children 的 children）

Answer 1

可能最好通过在顶级文章上调用 to_json 并配置 Article 的 as_json 方法来包含 sub_articles

class Article < ActiveRecord::Base
  def as_json(options={})
    super(methods: [:subarticles])
  end
end

在 rails 控制台中：

$> Article.find(3).to_json # => should give you the hierarchy you're looking for

如何在rails控制台显示所有关联集合？

How to display all association collection in rails console?

ruby-on-rails

ruby

activerecord

rubygems

rails-console

现在我拥有的是：

我想在 rails 控制台上显示的内容：