Question

Suppose I have a method that combines several address fields like so:

def address
    "#{street_address}, #{city}, #{state}, #{postal_code}, #{country}"
end

How would I extend the method to allow for the checking if any of the fields have changed? Basically, I’d like to be able to do the following:

after_validation :geocode, :if => :address.changed?

My model is as follows:

class Place < ActiveRecord::Base

  attr_accessible :street_address, :city, :state, :postal_code, :country, :latitude, :longitude, :geocode_type
  geocoded_by :address

  after_validation :geocode#, :if => :address.changed?

  def address
    "#{street_address}, #{city}, #{state}, #{postal_code}, #{country}"
  end
end

Or is there a better way to do this all together?

Answer 1

def address_changed?
  attrs = %w(street_address city state postal_code country)
  attrs.any?{|a| send "#{a}_changed?"}
end