ruby-on-rails - Rails 3：如何为有父亲、母亲和最多两个监护人的孩子建立协会？

Question

如何为有父亲、母亲和最多两名监护人的孩子建立入学协会？

我知道有很多方法可以设置它，但你会怎么做呢？我不太确定如何设置监护人。我目前正在考虑两种选择，也许你可以推荐第三种。

选项1

Enrollments
belongs_to child
belongs_to father
belongs_to mother

Children
has_one enrollment
has_one father
has_one mother

Father
has_many enrollments
has_many children

Mother
has_many enrollments
has_many children

选项 2

Enrollments
has_and_belongs_to_many adults

Adults
has_and_belongs_to_many enrollments
has_many children
# would have a "relationship: father, mother, guardian"

Children
has_one enrollment
has_one father
has_one mother

Answer 1

如果我是你，我会检查 has_many :through。

成年人

has_many children, :through => enrollments

孩子们

has many adults, :through => enrollments