has_one :through association sets up a
one-to-one connection with another model. This association indicates that the declaring model can be matched with one instance of another model by proceeding through a third model.
For example, if each
supplier has one
account, and each account is associated with one account history, then the supplier model could look like this:
class Supplier < ApplicationRecord has_one :account has_one :account_history, through: :account end class Account < ApplicationRecord belongs_to :supplier has_one :account_history end class AccountHistory < ApplicationRecord belongs_to :account end