Separate Django model field to another fields - django

Question

I have a field called fullname that has data something like this:
first_name:Gholi;last_name:Sezavar Poor Asl Esfahani
I want to separate it as two separate fields name first_name & last_name.
My models.py is:
from django.db import models
class Person(models.Model):
fullname = models.CharField(max_length=250, null=True)
information = models.CharField(max_length=350, null=True)
first_name = models.CharField(max_length=30, null=True)
last_name = models.CharField(max_length=50, null=True)
id_code = models.CharField(max_length=10, null=True)
born_in = models.CharField(max_length=30, null=True)
birth_year = models.PositiveIntegerField(null=True)
and I want to make custom migration for it and using annotate method.
How can I do this ???
EDIT:
I want to do this in custom migration and use annotate method like I have done it right now, but now with my code it just stores firstname and last name in first_name field :
def organize_person_schema(apps, schema_editor):
# Person = apps.get_model('people', 'Person')
Person.objects.annotate(
first_name_change=Replace(
F('fullname'), text=Value("first_name:"),
replacement=Value(''),
output_field=CharField()
)
).update(first_name=F('first_name_change'))
Person.objects.annotate(
last_name_change=Replace(
F('first_name'), text=Value(";last_name:"),
replacement=Value(' '),
output_field=CharField()
)
).update(first_name=F('last_name_change'))
Person.objects.annotate(
last_name_last=Concat(
F('first_name'), Value(""),
output_field=CharField()
)
).update(last_name=F('last_name_last'))

Answer 1

You can have a custom save method to do some update:
from django.db import models
class Person(models.Model):
fullname = models.CharField(max_length=250, null=True)
information = models.CharField(max_length=350, null=True)
first_name = models.CharField(max_length=30, null=True)
last_name = models.CharField(max_length=50, null=True)
id_code = models.CharField(max_length=10, null=True)
born_in = models.CharField(max_length=30, null=True)
birth_year = models.PositiveIntegerField(null=True)
def save(self, *args, **kwargs):
if not self.pk:
# logic to separate full name into first and last
# Split by (";")
first_name, last_name = self.fullname.split(";")
self.first_name = first_name.split(":")[1]
self.last_name = last_name.split(":")[1]
super(Person, self).save(*args, **kwargs)