composed_of_validations

ActiveModel::Validations support for composed_of

Installation

Add this line to your application's Gemfile:

gem 'composed_of_validations', git: '[email protected]:zwelch/composed_of_validations.git'

And then execute:

$ bundle

Usage

composed_of_validations patches ActiveRecord composed_of with support for ActiveModel::Validations. See issue 1513 for more background.

If we want to represent address attributes as a value object

class Person < ActiveRecord::Base
  composed_of :address, mapping: [%w(address_street street), 
                                  %w(address_city city), 
                                  %w(address_state state), 
                                  %w(address_zip zip)],
                        allow_nil: true
end

We can define our value object with validations

class Address
  include ActiveModel::Validations
  attr_reader :street, :city, :state, :zip
  
  def initialize(street, city, state, zip)
    @street = street
    @city = city
    @state = state
    @zip = zip
  end

  validates_presence_of :street, :city, :state, :zip
end

And receive support similar to ActiveRecord.

> person = Person.first
 => #<Person id: 1, name: "Tobias", address_street: "123 Sesame St", address_city: "Atlanta", address_state: "GA", address_zip: "30092"> 

> person.address
 => #<Address:0x007fc6b4e34ea0 @street="123 Sesame St", @city="Atlanta", @state="GA", @zip="30092"> 

> person.address = Address.new('New York Street', nil, 'NY', '10001')
> person.address.valid? 
 => false
> person.address.errors.full_messages
 => ["City can't be blank"]

composed_of_validations adds the autosave option to automatically save when a new value is assigned.

class Person < ActiveRecord::Base
  composed_of :address, mapping: [%w(address_street street), 
                                  %w(address_city city), 
                                  %w(address_state state), 
                                  %w(address_zip zip)],
                        allow_nil: true,
                        autosave: true
end

> person.persisted? 
 => false
> person.address = nil
 => nil
> person.address.persisted? 
 => true

Contributing

Fork it ( https://cagit.careerbuilder.com/zwelch/composed_of_validations/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create a new Pull Request

zacharywelch / composed_of_validations Goto Github PK