[Rails] has_many with 3 models

Hi,

I have the following 3 models. User , Relationship_type, and Link.

User
has_many :relationship_types

Relationship_type
belongs_to :users
has_many :links

Link
belongs_to :relationship_type

The Link model has a column :partner. I'd like to find all partners
of a user so I'd like to say in User model

has_many :partners
:through => :relationship_type, :link

but that creates errors. How can I do this to be able to say
something like userA.partners .

Similarly, how can I do the reverse, getting all users that link to a
partner , e.g. partnerA.users?

In addition, how can I get to User from Link, to say something like
linkA.user ?

Thanks.

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