Ruby on rails Rails通过关系基于中存在的集合进行查找

我试图根据包含集合的实例的关系选择实例。下面是一个简化的示例：

class Product::Variation < ActiveRecord::Base
  attr_accessible :name, :product_id, :quantity

  belongs_to :product
  has_many :bids, :foreign_key => :product_variation_id
  has_many :product_variation_property_values, :class_name => 'Product::Variation::PropertyValue'
  has_many :property_values, :through => :product_variation_property_values, :class_name => 'Property::Value'
end

class Product::Variation::PropertyValue < ActiveRecord::Base
  attr_accessible :property_value_id, :variation_id, :property_id

  belongs_to :variation
  belongs_to :property_value, :class_name => 'Property::Value'
end

class Property < ActiveRecord::Base
  attr_accessible :name

  has_many :values, :class_name => 'Property::Value'
end

class Property::Value < ActiveRecord::Base
  attr_accessible :content

  belongs_to :property
  belongs_to :partner
end

有没有一种方法可以使用ActiveRecord实现这一点

谢谢，如果你需要更多信息，请告诉我

更多信息

我尝试了以下方法：

Product::Variation.joins(:property_values).where('property_values.id' => [Property::Value.find(1).id, Property::Value.find(2).id]).first

…这是以下SQL

SELECT "product_variations".* FROM "product_variations" INNER JOIN "product_variation_property_values" ON "product_variation_property_values"."variation_id" = "product_variations"."id" INNER JOIN "property_values" ON "property_values"."id" = "product_variation_property_values"."property_value_id" WHERE "property_values"."id" IN (1, 2)

…而这返回

#<Product::Variation id: 25, product_id: 1, quantity: 39, created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45">

…我得到

[#<Property::Value id: 1, property_id: 1, content: "XS", created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45", color: nil, color_texture: nil, secondary_color: nil>, #<Property::Value id: 6, property_id: 2, content: "Dark Wood", created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45", color: "#855E42", color_texture: "striped", secondary_color: "#FFB90F">]

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但我正在寻找同时包含属性：：值1和2的Product：：变体。这将返回包含1或2的数据。

这应该可以通过连接查询实现。很难写出来，但应该是这样的：

Variation.joins(propert_values: :values).where('values.id' => [Property::Value.find(1).id, Property::Value.find(2).id]).first

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我尝试了你建议的一些编辑，但是在上面的更多信息下看到了我的结果。

[#<Property::Value id: 1, property_id: 1, content: "XS", created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45", color: nil, color_texture: nil, secondary_color: nil>, #<Property::Value id: 6, property_id: 2, content: "Dark Wood", created_at: "2013-11-18 00:18:45", updated_at: "2013-11-18 00:18:45", color: "#855E42", color_texture: "striped", secondary_color: "#FFB90F">]

Variation.joins(propert_values: :values).where('values.id' => [Property::Value.find(1).id, Property::Value.find(2).id]).first