Rails: Clean (strip) all String attributes before saving

clean_strings_extension.rb

# lib/core_ext/active_record_extensions.rb

module ActiveRecordExtensions
  extend ActiveSupport::Concern

  def clean_strings!
    self.attributes.select{|key, val| val.class == String}.each {|key, val| val.strip!}
  end

  included do
    before_validation :clean_strings!
  end

end

ActiveRecord::Base.send(:include, ActiveRecordExtensions)