Django - Overriding the Model.create() method?

Question

The Django docs only list examples for overriding save() and delete(). However, I\'d like to define some extra processing for my models onl

Answer 1

To answer the question literally, the create method in a model's manager is a standard way to create new objects in Django. To override, do something like

from django.db import models

class MyModelManager(models.Manager):
    def create(self, **obj_data):
        # Do some extra stuff here on the submitted data before saving...
        # For example...
        obj_data['my_field'] = my_computed_value(obj_data['my_other_field'])

        # Now call the super method which does the actual creation
        return super().create(**obj_data) # Python 3 syntax!!

class MyModel(models.model):
    # An example model
    my_field = models.CharField(max_length=250)
    my_other_field = models.CharField(max_length=250)

    objects = MyModelManager()

In this example, I'm overriding the Manager's method create method to do some extra processing before the instance is actually created.

NOTE: Code like

my_new_instance = MyModel.objects.create(my_field='my_field value')

will execute this modified create method, but code like

my_new_unsaved_instance = MyModel(my_field='my_field value')

will not.