from odoo import models

class MyModel(models.Model):
    _name = 'my.model'

    def create(self, vals):
        vals['name'] = vals.get('name', '').upper()
        record = super(MyModel, self).create(vals)
        return record

    def write(self, vals):
        if 'name' in vals:
            vals['name'] = vals['name'].upper()
        result = super(MyModel, self).write(vals)
        return result

• create: Called when a new record is created. Here, it modifies the name field to uppercase.
• write: Called when updating an existing record.

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