add before_save and after_save filters to sequel

gistfile2.txt

output

validate
before save BASE
before save MODEL
after_save MODEL

sequel.rb

require 'sequel'
require 'ap'

Sequel.postgres('databse', :user=>'user', :password=>'pass', :host=>'localhost', :port=>5432, :max_connections=>10)

class Sequel::Model

  @@_filters = { before_save:[] }

  def self.before_save(&proc)
    @@_filters[:before_save].push(proc)
  end

  def before_save
    for func in @@_filters[:before_save]
      instance_exec &func
    end
  end

  before_save do
    ap 'before save BASE'
  end

end

class Country < Sequel::Model

  before_save do
    ap 'before save MODEL'
  end

  def after_save
    ap 'after_save MODEL'
  end

  def validate
    ap 'validate'
  end


end

c = Country.last
c.code = 'aa'
c.save
ap c