A Rails plugin for stripping strings on models and replacing empty strings with nil values.

coerce_blanks.rb

module CoerceBlanks
  def write_attribute(attr_name, value)
    if value.is_a?(String)
      value.strip!
      value = nil if value.empty?
    end

    super
  end
end

init.rb

ActiveRecord::Base.class_eval do
  include CoerceBlanks
end