Object Creation Methods to easily make objects for testing, replacing the magic of Factory Girl and still keeping a nice syntax

object_creation_methods.rb

module ObjectCreationMethods
  # def make_user
  # def make_user!
  define User do
    {
      username: 'dam5s',
      email: 'dam5s@example.com',
      password: 's0m3pwd',
      password_confirmation: 's0m3pwd'
    }
  end
  
  # def make_robert
  # def make_robert!
  define User, 'robert' do
    {
      username: 'robert',
      email: 'rob@example.com',
      password: 's0m3pwdForR0b',
      password_confirmation: 's0m3pwdForR0b'
    }
  end

  # def make_feed
  # def make_feed!
  define Feed do
    {
      name: -> { %w(Twitter Delicious Flickr Blog Tumblr).sample },
      url: ->(feed) { "http://example.com/path/to/#{feed.name}.atom" },
      default: true
    }
  end

private

  def setup_object(object, attributes, defaults)
    defaults.merge(attributes).each do |name, value|
      value = value.call(object) if value.respond_to?(:call)
      object.send("#{name}=", value)
    end

    object
  end

  def self.define(klass, method_name = nil, &block)
    method_name ||= klass.to_s.underscore

    define_method "make_#{method_name}", ->(attributes = {}) {
      defaults = block.call
      setup_object(klass.new, attributes, defaults)
    }

    define_method "make_#{method_name}!", ->(attributes = {}) {
      send("make_#{method_name}").tap(&:save!)
    }
  end
end