Allowing an attribute and its validations to be set at the same time

lib/modest_model.rb

@@ -7,5 +7,6 @@
 module ModestModel
   autoload :Base,         File.expand_path('../modest_model/base', __FILE__)
   autoload :Validators,   File.expand_path('../modest_model/validators', __FILE__)
+  autoload :CombinedAttr, File.expand_path('../modest_model/combined_attr', __FILE__)
   autoload :Resource,     File.expand_path('../modest_model/resource', __FILE__)
 end

lib/modest_model/base.rb

@@ -8,6 +8,7 @@ class Base
     include   ActiveModel::AttributeMethods
 
     include   ModestModel::Validators
+    extend    ModestModel::CombinedAttr
 
     def initialize(attributes = {}, options={})
       self.assign_attributes(attributes, options)

lib/modest_model/combined_attr.rb

@@ -0,0 +1,10 @@
+module ModestModel
+  module CombinedAttr
+    def attribute *attrs
+      options = attrs.extract_options!
+      validations = options.slice!(*_validates_default_keys)
+      attributes *attrs
+      validates *(attrs +[validations]) if validations.any?
+    end
+  end
+end

test/fixtures/sample_model.rb

@@ -1,5 +1,4 @@
 class SampleModel < ModestModel::Base
   attributes :name, :email
-  attributes :nickname
-  validates :nickname, :absence => true
+  attribute :nickname, :absence => true
 end

test/fixtures/sample_resource.rb

@@ -1,9 +1,11 @@
 class SampleResource < ModestModel::Resource
-  attributes :id, :name, :email, :number
-  attributes :nickname, :saved_at, :destroyed_at
+  attributes :id, :name, :email
+  attributes :saved_at, :destroyed_at
   attributes :find_callback, :create_callback, :save_callback, :update_callback, :destroy_callback
-  validates :nickname, :absence => true
-  validates :number, :numericality => {:allow_blank => true}
+
+  # Attributes with validations
+  attribute :nickname, :absence => true
+  attribute :number, :numericality => {:allow_blank => true}
 
   after_find :set_find_callback
   def set_find_callback