users_id = [] Group.where(photo_id: 1).users.collect{|u| users_id << u.id} puts users_id
has_many因此，作为照片组，组belongs_to照片和组表具有photo_id作为外键。
所以，请尝试这个。
带有Select调用的双嵌套联接的Rails Active Record查询
带有Select调用的双嵌套联接的Rails Active Record查询
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