我有一个类方法Relationship.with_attributes
,我用它来构建一个基于多个输入参数的复杂范围,以返回与匹配某些属性的产品相关联的Relationship
个对象。在大多数情况下,我匹配的信息在Product
模型上,一切都很好:
def self.with_attributes(attributes)
if (attributes.nil?)
scoped
else # (attributes.class == Hash)
conds = joins(:product)
attributes.each do |key, value|
case key
when "Category"
# FIXME This doesn't work yet
category = Category.find(value)
categories = [category] + category.descendants
categories.each { |c| conds.push(["categories.id = #{c.id}"], :or) }
else
conds.where(key => value)
end
end
end
conds
end
挑战是当我的属性是一个类别时,我无法确定如何加入Categorizations
模型。任何建议都非常感谢。简化模型如下。
class Relationship < ActiveRecord::Base
belongs_to :product
…
end
class Product < ActiveRecord::Base
has_many :relations
has_many :categorizations
…
end
class Categorizations < ActiveRecord::Base
belongs_to :product
…
end
答案 0 :(得分:2)
我发布后不久就偶然发现了答案。答案是将conds = joins(:product)
更新为:
conds = joins(:product, { :product => :categorizations })