Create quick form objects that can validate.

Add this line to your application's Gemfile:

gem 'activeform'

And then execute:

$ bundle

Or install it yourself as:

$ gem install activeform

class SignUpForm < ActiveForm::Base
  attr_accessor :newsletter

  validates_through User, new_password: :password
  validates :newsletter, presence: true
end

form = LoginForm.new(params[:login_form])

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