如何通过rails中的has_many关系获取名称？

Question

我有：

class Foo
   has_many :bar
   has_many :baz, through :bar
end


class FooTwo
   has_many :barTwo
   has_many :baz, through :barTwo
end

我需要能够完成与baz协会的关系，例如：

Foo.first.baz.relation_through #<=> Foo.first.bar
FooTwo.first.baz.relation_through #<=> Foo.first.barTwo

如果不可能，我能得到这个名字吗？喜欢：

Foo.first.baz.get_relation_through_name # "bar"
FooTwo.first.baz.get_relation_through_name # "barTwo"

Answer 1

试试这个

Foo.reflect_on_all_associations.find { |association| association.name == :baz}.options[:through]

Answer 2

您正在寻找：http://apidock.com/rails/ActiveRecord/Reflection/ClassMethods/reflect_on_all_associations

Foo.reflect_on_all_associations(:has_many) 

然后选择这个名字。