Lazymodel

This rails gem helps get ActiveModel goodies without the hassle to write a ton of code.

Usage

Add to your gemfile:

gem 'lazymodel'

Create the model class that gets ActiveModel features. The key point is having the class inherit from Lazymodel::Base

class Person < Lazymodel::Base
  activemodel_attributes :name, :surname, :suffix => '?', :callbacks => {
    :before_create => :capitalize_attributes,
    :after_update  => [:notify_admin, :check_data]
  }

  validates :name, :surname, :presence => true

  def save
    run_callbacks {# saving...}
  end

  def update
    run_callbacks {# updating...}
  end

  private

  def attribute?(attribute)
    send(attribute).present?
  end

  def check_data; end
  def notify_admin; end
  def capitalize_attributes; end
end

This will grant you the power of the following modules:

ActiveModel::Naming
ActiveModel::Concern
ActiveModel::Callbacks
ActiveModel::Validations
ActiveModel::AttributeMethods

Via the class macro activemodel_attributes you can define in a single call the model attributes and its prefixed and suffixed methods. You also get reasonable initialize, to_model, persisted?, attributes method defaults.

The class complies with ActiveModel::Lint::Tests specifications.