has_many ：通过 +多态关系

发布于 2024-09-30 14:54:27 字数 635 浏览 2 评论 0原文

我使用rails3并尝试建立一些复杂的关联。

我有产品、版本和属性模型。

class Version < ActiveRecord::Base
  belongs_to :product
  has_many :specs
  has_many :properties, :through => :specs
end

class Product < ActiveRecord::Base
  has_many :versions
  has_many :specs
  has_many :properties, :through => :specs
end

class Property < ActiveRecord::Base
end

class Spec < ActiveRecord::Base
  belongs_to :product
  belongs_to :spec
  belongs_to :version
end

它工作完美，但我想使用产品和版本作为多态关系，因此表规格将只有spec_id和some_other_id，而不是spec_id、product_id、version_id。

我不知道应该把 :as 放在哪里， :polymorphic => 放在哪里真的。你能帮助我吗？

原文

I using rails3 and trying to build some complex associations.

I have Product, Version and Property models.

class Version < ActiveRecord::Base
  belongs_to :product
  has_many :specs
  has_many :properties, :through => :specs
end

class Product < ActiveRecord::Base
  has_many :versions
  has_many :specs
  has_many :properties, :through => :specs
end

class Property < ActiveRecord::Base
end

class Spec < ActiveRecord::Base
  belongs_to :product
  belongs_to :spec
  belongs_to :version
end

It works perfect, but i want to use product and version as polymorphic relations, so table specs will have only spec_id and some_other_id, instead of spec_id, product_id, version_id.

I can't figure out where i should put :as and where :polymorphic => true. Can you help me?

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蘸点软妹酱 2024-10-07 14:54:27

怎么样：

class Version < ActiveRecord::Base
  belongs_to :product
  has_many :specs, :as => :speccable
  has_many :properties, :through => :specs
end

class Product < ActiveRecord::Base
  has_many :versions
  has_many :specs, :as => :speccable
  has_many :properties, :through => :specs
end

class Property < ActiveRecord::Base
end

class Spec < ActiveRecord::Base
  belongs_to :speccable, :polymorphic => true
  belongs_to :spec
end
#table: specs(id,spec_id,speccable_type,speccable_id)

How about:

class Version < ActiveRecord::Base
  belongs_to :product
  has_many :specs, :as => :speccable
  has_many :properties, :through => :specs
end

class Product < ActiveRecord::Base
  has_many :versions
  has_many :specs, :as => :speccable
  has_many :properties, :through => :specs
end

class Property < ActiveRecord::Base
end

class Spec < ActiveRecord::Base
  belongs_to :speccable, :polymorphic => true
  belongs_to :spec
end
#table: specs(id,spec_id,speccable_type,speccable_id)

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