released: active_record_compose 1.0.0 — Wrap multiple models with an ActiveModel interface

#ruby #rails

I just released version 1.0.0 of my gem active_record_compose. 🎉

hamajyotan/active_record_compose (GitHub)

As mentioned in my previous post, this gem has been continuously improved.
Today, I'm excited to announce version 1.0.0!

If you’re curious, here’s my previous post:
Smart way to update multiple models simultaneously in Rails

ActiveRecord Compose is a Ruby gem that implements the form object pattern, allowing you to combine multiple ActiveRecord models into a single, unified business interface.
It goes beyond simple form objects: for example, handling user registration that spans multiple tables. With this approach, complex business operations become easier to write, validate, and maintain. It is built on top of ActiveModel::Model, leveraging the existing Rails infrastructure.

Example:

class Foo < ApplicationRecord
  validates :name, presence: true
end
class Bar < ApplicationRecord
  validates :age, presence: true
end

class Baz < ActiveRecordCompose::Model
  def initialize(attributes)
    @foo = Foo.new
    @bar = Bar.new
    models << foo << bar
    super(attributes)
  end

  delegate_attribute :name, to: :foo
  delegate_attribute :age, to: :bar

  private attr_reader :foo, :bar
end

baz = Baz.new(name: "qux", age: nil)
baz.attributes  #=> {"name" => "qux", "age" => nil}

baz.save  #=> false  # validation from Bar propagates to Baz
baz.errors.to_a  #=> ["Age can't be blank"]

baz.age = 36
baz.save  #=> true

[Foo.count, Bar.count] #=> [1, 1]