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第一次海报 - 半新到Rails。这是我的问题。假设你有以下的多态多对许多协会的Rails:从ActiveRecord检索和排序多个阵列联接表 - Ruby on Rails
class Tag < ActiveRecord::Base
has_many :taggings, :dependent => :destroy
has_many :books, :through => :taggings, :source => :taggable, :source_type => "Book"
has_many :movies, :through => :taggings, :source => :taggable, :source_type => "Movie"
end
class Tagging < ActiveRecord::Base
belongs_to :taggable, :polymorphic => true
belongs_to :tag
end
class Book < ActiveRecord::Base
has_many :taggings, :as => :taggable
has_many :tags, :through => :taggings
end
class Movie < ActiveRecord::Base
has_many :taggings, :as => :taggable
has_many :tags, :through => :taggings
end
现在我的问题是让我们说我引用的Tagging数组回来,我需要采取taggable_id并返回所有书籍和电影作为新阵列。我将如何做到这一点?
如果这是令人困惑的,从更一般的意义上说,如何找到给定标签的所有电影和书籍?
我立即开始思考自定义SQL查找器是需要的,但我很好奇,如果我错过了一些“导轨魔术”。 :)
谢谢!!