Ruby on Rails - has_one:through association in ruby on rails - ruby on rails tutorial - rails guides - rails tutorial - ruby rails
- A 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.
Example
- if each supplier has one account, and each account is associated with one account history.
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