Redmine

Look into the after_save callback

You have to create a plugin to inject the after_save behavior.
A very simplistic use case for a model called TargetModel would be (Didn't test, dummy code):

module MyPlugin
  module TargetModelPatch
    def self.included(base) # :nodoc:
      base.send(:include, InstanceMethods)

      base.class_eval do
        unloadable

        after_save :my_custom_callback
      end
    end

    module InstanceMethods
      def my_custom_callback
        # Insert code to be called after TargetModel is saved (created or updated)
        # use 'self' to get the current TargetModel instance
    end
  end
end

TargetModel.send(:include, MyPlugin::TargetModelPatch)

Cheers,

-Martin

thanks