在 Ruby on Rails 中使用命名范围/lambda 进行空属性选择
我有一个 JobBreakdown 对象 has_one :invoice。如果JobBreakdown 有发票（即invoice_id 不为nil），那么它被视为已开票。如果不是，则考虑UNINVOICED。用户希望能够从下拉框中选择“已开票”或“未开票”并显示正确的记录。
我将如何编写命名范围来测试并返回正确的记录？注意
named_scope :is_invoiced, lambda {|is_invoiced| {:conditions => :invoice.nil? == is_invoiced}}
：我使用的是 ruby 1.8.7，rails 2.3.5
I have an object JobBreakdown that has_one :invoice. If a JobBreakdown has an invoice (i.e. invoice_id is not nil) then it is considered INVOICED. If not, it is consider UNINVOICED. Users want to be able to select from a drop down box Invoiced or Uninvoiced and have correct records show up.
How would I write a named scope to test and return the right records? Something along the lines of
named_scope :is_invoiced, lambda {|is_invoiced| {:conditions => :invoice.nil? == is_invoiced}}
NB: I am using ruby 1.8.7, rails 2.3.5
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我不确定，这是 Rails 2.x 的正确语法，但至少它会让您了解如何做到这一点。
或者甚至可能是这样的：
I'm not sure, this is the right syntax for rails 2.x but at least it'll give you an idea of how to do that.
or maybe even something like this: