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我将如何利用一个联合体来创造范围,只有所有具有才华关系的人(铁路)都被视为真实的纪录才能返回。
原标题:How would I create a scope using a join that will return only records where all of a has_many relationship read as true (ruby on rails)

我曾试图为这一模式撰写一个范围,以帮助过滤,并且只发现所有参与者(具有重要关系)具有公认价值的记录。 我面临的问题是,在试图做到这一点时,我获得所有记录,atless1 一名参与者具有公认价值。 我将如何调整这一范围,使之只适应所有参与者在确认时具有价值的收益。

所涉范围:

scope :completed, -> { joins(:example_participants).where( example_participants.acknowledged_at is not null ) }

我尝试改变这种方式,但还没有取得结果,只与一位与会者一起对记录进行过滤。

我的目标是只记录all > 参与者在确认的_at上的价值。

问题回答

I would do it in the other direction.

scope :completed, -> {
  where.not(id: ExampleParticipant.select(:this_model_id).where(acknowledged_at: nil))
}




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