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| class User < ApplicationRecord | |
| has_one :car | |
| validates :username, presence: true, | |
| validates :username, length: { maximum: 100 } | |
| validates :age, numericality: { only_integer: true } | |
| end | |
| class Car < ApplicationRecord | |
| enum vehicle_type: %i[suv van compact] | |
| belongs_to :user | |
| validates :user, presence: true | |
| validates :model, presence: true | |
| end | |
| class UserAdultForm < BaseForm | |
| USER_ATTRIBUTES = %i[username age] | |
| CAR_ATTRIBUTES = %i[model vehicle_type] | |
| attr_accessor(*USER_ATTRIBUTES) | |
| attr_accessor(*CAR_ATTRIBUTES) | |
| validates :age, numericality: { greater_than_or_equal_to: 18 } | |
| def initialize(params = {}) | |
| @user = initialize_user(params) | |
| @car = initialize_car(params) | |
| super( | |
| params.merge( | |
| user.slice(*USER_ATTRIBUTES) | |
| ).merge( | |
| car.slice(*CAR_ATTRIBUTES) | |
| ) | |
| ) | |
| end | |
| def valid? | |
| errors.clear | |
| super | |
| user.valid? | |
| delegate_validation_on(user, :username) | |
| delegate_validation_on(user, :age) | |
| car.valid? | |
| delegate_validation_on(car, :model) | |
| delegate_validation_on(car, :vehicle_type) | |
| errors.empty? | |
| end | |
| def vehicle_types | |
| Car.vehicle_types.keys | |
| end | |
| private | |
| attr_reader :user | |
| attr_reader :car | |
| def persist! | |
| ActiveRecord::Base.transaction do | |
| user.save! | |
| car.save! | |
| end | |
| end | |
| def initialize_user(params) | |
| user = params[:id] ? User.find(params[:id]) : User.new | |
| user.attributes = params.slice(*USER_ATTRIBUTES) | |
| user | |
| end | |
| def initialize_car(params) | |
| car = user.car || user.build_car | |
| car.attributes = params.slice(*CAR_ATTRIBUTES) | |
| car | |
| end | |
| end |
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