FragmentedValidation allows your model to only validate selected attributes.

Add this line to your application's Gemfile:

gem 'fragmented_validation'

And then execute:

$ bundle

Or install it yourself as:

$ gem install fragmented_validation

  class User < ActiveRecord::Base
      fragmented_validation
   end

  person.valid_email?

person.fragmented_validation_on(:username, :email)

or

person.fragmented_validation_except(:password)

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