Initial release

.gitignore

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+pkg/*
+*.gem
+.bundle

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in formatted_attributes.gemspec
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    formatted_attributes (0.1.0)
+      activerecord
+
+GEM
+  remote: http://rubygems.org/
+  specs:
+    abstract (1.0.0)
+    actionpack (3.0.1)
+      activemodel (= 3.0.1)
+      activesupport (= 3.0.1)
+      builder (~> 2.1.2)
+      erubis (~> 2.6.6)
+      i18n (~> 0.4.1)
+      rack (~> 1.2.1)
+      rack-mount (~> 0.6.12)
+      rack-test (~> 0.5.4)
+      tzinfo (~> 0.3.23)
+    activemodel (3.0.1)
+      activesupport (= 3.0.1)
+      builder (~> 2.1.2)
+      i18n (~> 0.4.1)
+    activerecord (3.0.1)
+      activemodel (= 3.0.1)
+      activesupport (= 3.0.1)
+      arel (~> 1.0.0)
+      tzinfo (~> 0.3.23)
+    activesupport (3.0.1)
+    archive-tar-minitar (0.5.2)
+    arel (1.0.1)
+      activesupport (~> 3.0.0)
+    builder (2.1.2)
+    columnize (0.3.1)
+    diff-lcs (1.1.2)
+    erubis (2.6.6)
+      abstract (>= 1.0.0)
+    i18n (0.4.1)
+    linecache19 (0.5.11)
+      ruby_core_source (>= 0.1.4)
+    rack (1.2.1)
+    rack-mount (0.6.13)
+      rack (>= 1.0.0)
+    rack-test (0.5.6)
+      rack (>= 1.0)
+    rspec (2.0.1)
+      rspec-core (~> 2.0.1)
+      rspec-expectations (~> 2.0.1)
+      rspec-mocks (~> 2.0.1)
+    rspec-core (2.0.1)
+    rspec-expectations (2.0.1)
+      diff-lcs (>= 1.1.2)
+    rspec-mocks (2.0.1)
+      rspec-core (~> 2.0.1)
+      rspec-expectations (~> 2.0.1)
+    ruby-debug-base19 (0.11.24)
+      columnize (>= 0.3.1)
+      linecache19 (>= 0.5.11)
+      ruby_core_source (>= 0.1.4)
+    ruby-debug19 (0.11.6)
+      columnize (>= 0.3.1)
+      linecache19 (>= 0.5.11)
+      ruby-debug-base19 (>= 0.11.19)
+    ruby_core_source (0.1.4)
+      archive-tar-minitar (>= 0.5.2)
+    sqlite3-ruby (1.3.1)
+    tzinfo (0.3.23)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  actionpack
+  activerecord
+  formatted_attributes!
+  rspec (>= 2.0.0)
+  ruby-debug19
+  sqlite3-ruby

README.rdoc

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+= Formatted Attributes
+
+Sometimes you want to use a proxy attribute that will be formatted while displaying its value or receiving data from user.
+
+== Install
+
+  gem install formatted_attributes
+
+== Usage
+
+A formatted attribute will require two methods: <tt>format_to_#{formatter}</tt> and <tt>format_from_#{formatter}</tt>. The <tt>format_to_*</tt> method will convert the formatted value to the original value and the <tt>format_from_*</tt> method will do the other way around, converting the original value to the formatted version.
+
+See an example on how to format prices from strings like <tt>1,23</tt> to cents like <tt>123</tt> and vice-versa.
+
+  class Product < ActiveRecord::Base
+    include ActionView::Helpers::NumberHelper
+
+    formatted :price, :with => :cents
+
+    private
+    def format_to_cents(amount)
+      _, operator, number, precision = *number.to_s.match(/^([+-])?(\d+)(?:[,.](\d+))?$/)
+      (BigDecimal("#{operator}#{number}.#{precision.to_i}") * 100).to_i
+    end
+
+    def format_from_cents(amount)
+      number = BigDecimal(number.to_s) / 100
+      number_to_currency(number, :unit => "", :separator => ",", :delimiter => "")
+    end
+  end
+
+  product = Product.new(:formatted_price => "1,23")
+  product.price
+  #=> 123
+
+  product.price = 456
+  product.formatted_price
+  #=> "4,56"
+
+== Maintainer
+
+* Nando Vieira (http://nandovieira.com.br)
+
+== License
+
+(The MIT License)
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Rakefile

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+require "bundler"
+Bundler::GemHelper.install_tasks
+
+require "rspec/core/rake_task"
+RSpec::Core::RakeTask.new

formatted_attributes.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "formatted_attributes/version"
+
+Gem::Specification.new do |s|
+  s.name        = "formatted_attributes"
+  s.version     = FormattedAttributes::Version::STRING
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["Nando Vieira"]
+  s.email       = ["fnando.vieira@gmail.com"]
+  s.homepage    = "http://rubygems.org/gems/formatted_attributes"
+  s.summary     = "Add formatted methods for ActiveRecord attributes"
+  s.description = "Sometimes you need to expose a helper method that will convert its value before saving it to the database. This gem will add `formatted_` suffix to the attributes you specify."
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+
+  s.add_dependency "activerecord"
+  s.add_development_dependency "rspec", ">= 2.0.0"
+  s.add_development_dependency "sqlite3-ruby"
+  s.add_development_dependency "actionpack"
+  s.add_development_dependency "ruby-debug19"
+end

lib/formatted_attributes.rb

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+require "active_record"
+require "formatted_attributes/active_record"
+require "formatted_attributes/version"
+
+ActiveRecord::Base.send :include, FormattedAttributes::ActiveRecord

lib/formatted_attributes/active_record.rb

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+module FormattedAttributes
+  module ActiveRecord
+    def self.included(base)
+      base.instance_eval do
+        include InstanceMethods
+        extend ClassMethods
+      end
+    end
+
+    module ClassMethods
+      def formatted(*args)
+        options = args.extract_options!
+
+        args.each do |attr|
+          accessible_attributes << "formatted_#{attr}"
+
+          class_eval <<-RUBY
+            def #{attr}=(value)
+              @formatted_#{attr} = nil
+              write_attribute :#{attr}, value
+            end
+
+            def formatted_#{attr}
+              @formatted_#{attr} ||= format_from_#{options[:with]}(send(:#{attr}))
+            end
+
+            def formatted_#{attr}=(value)
+              self.send :#{attr}=, format_to_#{options[:with]}(value)
+              @formatted_#{attr} = value
+            end
+          RUBY
+        end
+      end
+    end
+
+    module InstanceMethods
+    end
+  end
+end

lib/formatted_attributes/version.rb

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+module FormattedAttributes
+  module Version
+    MAJOR = 0
+    MINOR = 1
+    PATCH = 0
+    STRING = "#{MAJOR}.#{MINOR}.#{PATCH}"
+  end
+end

spec/formatted_attributes_spec.rb

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+require "spec_helper"
+
+describe FormattedAttributes do
+  subject { Product.new }
+
+  context "formatted methods" do
+    it "should add getters" do
+      subject.should respond_to(:formatted_price)
+      subject.should respond_to(:formatted_shipping)
+    end
+
+    it "should add setters" do
+      subject.should respond_to(:formatted_price=)
+      subject.should respond_to(:formatted_shipping=)
+    end
+
+    it "should set initial value" do
+      subject.price = 12300
+      subject.formatted_price.should == "123,00"
+    end
+
+    it "should update formatted price" do
+      subject.price = 12300
+      subject.formatted_price.should == "123,00"
+
+      subject.price = 45600
+      subject.formatted_price.should == "456,00"
+    end
+
+    it "should set formatted value" do
+      subject.price = 12300
+      subject.formatted_price = "456,78"
+      subject.formatted_price.should == "456,78"
+      subject.price.should == 45678
+
+      subject.shipping = 67800
+      subject.formatted_shipping = "345,67"
+      subject.formatted_shipping.should == "345,67"
+      subject.shipping.should == 34567
+
+      subject.should be_valid
+    end
+  end
+end

spec/schema.rb

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+ActiveRecord::Schema.define(:version => 0) do
+  create_table :products do |t|
+    t.integer :price, :shipping, :default => 0, :null => false
+  end
+end

spec/spec_helper.rb

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+require "formatted_attributes"
+require "active_support/all"
+require "action_view/helpers/number_helper"
+
+ActiveRecord::Base.establish_connection :adapter => "sqlite3", :database => ":memory:"
+
+load File.dirname(__FILE__) + "/schema.rb"
+
+class Product < ActiveRecord::Base
+  include ActionView::Helpers::NumberHelper
+  formatted :price, :shipping, :with => :cents
+
+  validates_numericality_of :price, :shipping, :only_integer => true
+
+  private
+  def format_to_cents(number)
+    _, operator, number, precision = *number.to_s.match(/^([+-])?(\d+)(?:[,.](\d+))?$/)
+    (BigDecimal("#{operator}#{number}.#{precision.to_i}") * 100).to_i
+  end
+
+  def format_from_cents(number)
+    number = BigDecimal(number.to_s) / 100
+    number_to_currency(number, :unit => "", :separator => ",", :delimiter => "")
+  end
+end