This Gem provides an ActiveModel::FormObject module that can be included into a PORO. Includes a Rails Generator for Form Objects.

Form Objects are used to encapsulate operations which are triggered by a form submission. They are particularly useful when multiple Models need to be updated by a single form submission. A common example would be a signup form that results in the creation of both a Company and a User.

##Install

In your Gemfile

gem 'active_model_form_objects'

And then execute:

$ bundle

The following example generates a UserLogin form-object (and test).

$ rails generate active_model:form_object user login

The test framework your project uses will determine the type of test created:

• For RSpec it creates:

• Form-object: app/form_objects/user_login.rb

• Test: spec/form_objects/user_login_spec.rb

• For MiniTest it creates:

• Form-object: app/form_objects/user_login.rb

• Test: test/form_objects/user_login_test.rb

• For TestUnit it creates:

• Form-object: app/form_objects/user_login.rb

• Test: test/unit/form_objects/user_login_test.rb

The following example demonstrates a user signup form-object and how this would be intergrated with a form.

• Points of interest:
• The use of the before_validation callback hook.
• The use of the NestedValidator to run any existing validations defined on the User model.

require 'active_model'

class UserSignup
  include ActiveModel::FormObject

  attr_accessor :name
  attr_reader :user

  validates :name, :length => { :minimum => 5 }
  validates :user, :nested => true

  before_validation :create_user

  private

  def create_user
    @user = User.new(:name => name)
  end

  def persist!
    user.save!
  end
end

class UsersController < ApplicationController
  respond_to :html

  def signup
    @signup_form = UserSignup.new
  end

  def create
    @signup_form = UserSignup.new(params[:user])
    if @signup_form.save()
      @user = @signup_form.user
      respond_with @user
    else
      render "signup"
    end
  end
end

<h1>Users#signup</h1>

<%= form_for @signup_form do |f| %>
  <%= f.text_field :name %>
  <%= f.submit "Submit" %>
<% end %>

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

This project rocks and uses MIT-LICENSE.