Rails3:合并范围与OR范围、OR

2023-09-08 15:46:21 作者:温柔又能打

我需要的名字范围结合或运营商... 是这样的:

I need to combine name scope with or operator... Something like:

class Product < ActiveRecord::Base
  belongs_to :client

  scope :name_a, where("products.name = 'a'")
  scope :client_b, joins(:client).where("clients.name = 'b'")

  scope :name_a_or_b, name_a.or(client_b)  
end

THX

推荐答案

从阿雷尔文档

目前还不支持运营商。它的工作是这样的:    users.where(网友[:名称] .EQ('鲍勃')或(用户。[:年龄] .LT(25)))

The OR operator is not yet supported. It will work like this: users.where(users[:name].eq('bob').or(users[:age].lt(25)))

这RailsCast 展示了如何使用。或运营商。但是,它与阿雷尔对象的工作,而你有的ActiveRecord ::关联的实例。 您可以使用一个关系转换为阿雷尔 Product.name_a.arel ,但现在你必须找出如何合并的条件。

This RailsCast shows you how to use the .or operator. However, it works with Arel objects while you have instances of ActiveRecord::Relation. You can convert a relation to Arel using Product.name_a.arel, but now you have to figure out how to merge the conditions.