Defining onchange with the compute method

In the last two recipes, we saw how to define and call the onchange method. We also saw its limitation, which is that it can only be invoked automatically from the user interface. As a solution to this problem, Odoo v13 introduced a new way to define onchange behavior. In this recipe, we will learn how to use the compute method to produce behavior similar to that of the onchange method.

Getting ready

For this recipe, we will use the my_hostel module from the previous recipe. We will replace the onchange method of hostel.student with the compute method.

How to do it...

Follow these steps to modify the onchange method with the compute method:

1. Replace api.onchange in the onchange_duration() method with depends, like this:

   @api.depends('admission_date', 'discharge_date')
    def onchange_duration(self):
           ...

2. Add the compute parameter in the definition of the field...