Rails-has_one：through和has_many：through

Question

I want to design a club system. A club has many users, a user has one club, and a membership to store some info. Can I use has_one :through and has_many :through to build one-to-many associations?

class Club < ApplicationRecord
  has_many :users， through: :memberships
  has_many :memberships
end

class Membership < ApplicationRecord
  belongs_to :club
  belongs_to :user
end

class User < ApplicationRecord
  has_one :club, through: :membership
  has_one :membership
end

Because in the Rails Guides, it mentions has_one :through to build one-to-one association, and has_many :through to build many-to-many association. Can I use this way? Thanks.

Answer 1

You can. You have to adjust your models a bit to define your through part before defining another association that goes through it, ie

class Club < ApplicationRecord
  has_many :memberships
  has_many :users， through: :memberships
end

class User < ApplicationRecord
  has_one :membership
  has_one :club, through: :membership
end