Rails 3：可选 has_one 关联的范围
我有两个模型：销售和付款
class Sale < ActiveRecord::Base
has_one :payment
end
class SaleCancelation < ActiveRecord::Base
belongs_to :payment
end
我想创建两个范围，“付款”和“不付款”。
“with_ payment”工作起来很简单：
class Sale < ActiveRecord::Base
scope :with_payment, joins( :payment )
end
但是我如何创建一个范围来查找没有有关联付款的每笔销售？
I have two models: Sale and Payment
class Sale < ActiveRecord::Base
has_one :payment
end
class SaleCancelation < ActiveRecord::Base
belongs_to :payment
end
I want to create two scopes, "with payment" and "without payment".
"with_payment" works easyly:
class Sale < ActiveRecord::Base
scope :with_payment, joins( :payment )
end
But how can I create a scope that finds every sale that does not have an associated Payment?
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怎么样：
How about:
另一种方法：
Another way to do it: