Providing a static default value for a new field in existing objects in model?

Asked Dec 26 '19 at 23:05

Active Dec 26 '19 at 23:05

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I have a model that has 10000 objects and I want to add a new field to it that equals the result of a function acting on another field

class MyModel(models.Model):
    id = models.CharField(max_length=255)
    field1 = models.CharField(max_length=255)
    new_field = models.CharField(max_length=255,default=my_func(self.field1))

how can I achieve this? to provide a default value for every object in my DB based upon one of its fields

asked Dec 26 '19 at 23:05

Ammar rady

1

Does this answer your question? [Django Migrations Add Field with Default as Function of Model](https://stackoverflow.com/questions/29787853/django-migrations-add-field-with-default-as-function-of-model) – Tom Wojcik Dec 26 '19 at 23:08
1

thanks for your help this is what i needed. – Ammar rady Dec 26 '19 at 23:11
1

i flagged the question. – Ammar rady Dec 26 '19 at 23:12

Providing a static default value for a new field in existing objects in model?

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