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我有自己的參考habtm
協議。Rails HABTM協會
class Label < AR::B
has_and_belongs_to_many :a_label, :class_name => "Label",
:join_table => "a_labels",
:foreign_key => "label_id",
:association_foreign_key => "a_label_id",
:uniq => true
end
但是,當我創建查詢(用squeel
):
Label.select{:title}.where do
id.in(Label.select{:a_label_id}.joins(:a_labels).where{
labels.title.in(list)
})
模式:
labels:
id | title | description | created_at
a_labels
label_id | a_label_id
我得到了錯誤:
ActiveRecord::ConfigurationError:
Association named 'a_labels' was not found; perhaps you misspelled it?
哪裏錯了? 謝謝。
我有一個更復雜的查詢。我更新了問題。 – Mike 2012-07-14 18:38:24