Rails 多态 has_many :through
我正在从外部 API 提取一些数据，并希望在本地缓存结果。我有一个 类 SearchTerm，我希望通过表 searchable_items 将其与一些不同的 ActiveRecord 类型相关联。我很确定我的表格设置正确，但我的关联中一定有问题。
class Foo < ActiveRecord::Base
has_many :search_terms, :as => :searchable, :through => :searchable_items
end
class Bar < ActiveRecord::Base
has_many :search_terms, :as => :searchable, :through => :searchable_items
end
class SearchTerm < ActiveRecord::Base
has_many :searchables, :through => :searchable_items
end
class SearchableItem < ActiveRecord::Base
belongs_to :search_term
belongs_to :searchable, :polymorphic => true
end
我希望能够执行类似 SearchTerm.find_by_term('SearchTerm').searchables 的操作（并且它将返回 Foo 和 Bar 对象的数组），但是，我收到错误 无法在模型 SearchTerm 中找到关联：searchable_items
预先感谢您向我提供的任何见解！
I'm pulling some data from an external API and would like to cache the results locally. I have a class SearchTerm, which I would like to be associated with a few different ActiveRecord types through the table searchable_items. I'm pretty sure I have the tables set up correctly, but something in my associations must be wrong.
class Foo < ActiveRecord::Base
has_many :search_terms, :as => :searchable, :through => :searchable_items
end
class Bar < ActiveRecord::Base
has_many :search_terms, :as => :searchable, :through => :searchable_items
end
class SearchTerm < ActiveRecord::Base
has_many :searchables, :through => :searchable_items
end
class SearchableItem < ActiveRecord::Base
belongs_to :search_term
belongs_to :searchable, :polymorphic => true
end
I would expect to be able to do something like SearchTerm.find_by_term('SearchTerm').searchables (and it would return an array of Foo and Bar objects) however, I get the errorCould not find the association :searchable_items in model SearchTerm
Thanks in advance for any insight you can provide to me!
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您需要将
has_many :searchable_items关联添加到Foo、Bar和SearchTerm模型，因为:through = > :searchable_items选项引用该关联。http://guides.rubyonrails.org/association_basics.html#the-has_many-through-association< /a>
You need to add
has_many :searchable_itemsassociation toFoo,BarandSearchTermmodels because:through => :searchable_itemsoption refers to that association.http://guides.rubyonrails.org/association_basics.html#the-has_many-through-association