How to add a custom Django model field?

To add a custom field to a Django model, you can define a field as a class attribute on the model. For example:

from django.db import models

class MyModel(models.Model):
    # other fields go here
    custom_field = models.CharField(max_length=100)

This will add a custom_field field to the MyModel model, which is a character field with a maximum length of 100 characters.

You can then use this field like any other field in your Django application. For example, you can access the value of the custom_field the field for a particular instance of MyModel using the custom_field attribute:

instance = MyModel.objects.get(pk=1)
custom_field_value = instance.custom_field

You can also use the custom_field field in your Django model's Meta class to specify additional options for the field. For example:

class MyModel(models.Model):
    # other fields go here
    custom_field = models.CharField(max_length=100)

    class Meta:
        ordering = ['custom_field']

This will specify that the MyModel model should be ordered by the custom_field field when queried.

After adding a custom field to your Django model, you will need to run makemigrations and migrate to apply the changes to the database.

python manage.py makemigrations
python manage.py migrate