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3. 铁路对无铁的试验范围
原标题:Rails scope testing for nil

我有一个支出表。 它有一栏发票。

I would like 2 scopes - one for billed expenses and one for not billed. I thought I could just test to see if invoice_id was nil.

scope :notbilled, where(:invoice_id == nil)
scope :billed, where(:invoice_id != nil)

但是,这并不奏效。

任何想法?

Thanks!

最佳回答

首先,你们需要使用 has子:

scope :notbilled, where(:invoice_id => nil)

第二,要求你使用原材料:

scope :billed, where( invoice_id is not null )

你们还可以跳跃为第二版的灯塔,以避免书写原材料,但这是一个先进的课题,其最终可读性低于原木。

利用直接的平等赢得了t工作,因为这些表述立即得到评估,并且由于没有涉及变数而变成其毛豆等同物,因此,它们将被解释为

scope :notbilled, where(false)
scope :billed, where(true)
问题回答

www.un.org/spanish/ecosoc 铁路4号的最新答案:

scope :notbilled, where(invoice_id: nil)
scope :billed, where.not(invoice_id: nil)

这是积极记录4中增加的新特点。

Docs: (关于“非直接条件”的研究,目前第2.4节)





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