fanciness.rb

# here is a small piece of trickery to assign the remindable assoication
# when reminder_attributes=(attrs) is called. 
# When using nested_attributes/build we have a problem in the reminder model
# since Todo.new(:reminder_attributes => {:something => :good}).reminder returns a reminder
# however Todo.new(:reminder_attributes => {:valid => :attributes}).reminder.remindable returns nil
# this alias sets the todo as the in memory object so the reminder can access the parent
def reminder_attributes_with_assign_todo=(reminder_attrs)
  self.reminder_attributes_without_assign_todo = reminder_attrs.merge(:remindable => self)
end
alias_method_chain :reminder_attributes=, :assign_todo