Django fixtures save with default value

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Chapters
00:00 Django Fixtures Save With Default Value
02:08 Accepted Answer Score 7
02:35 Answer 2 Score 2
02:55 Answer 3 Score 1
03:15 Thank you

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Full question
https://stackoverflow.com/questions/2572...

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#python #django #fixtures #python34 #django17

#avk47

ACCEPTED ANSWER

Score 7

The solution was to use django signals:

import uuid
from django.db import models
from django.utils.translation import ugettext_lazy as _
from django.db.models.signals import pre_save
from django.dispatch import receiver

class Uuidable(models.Model):
    uuid = models.CharField(_('uuid'), blank=True,
                            null=False, unique=True,
                            max_length=64, default=uuid.uuid4())

    class Meta:
        abstract = True

    @receiver(pre_save)
    def set_uuid_on_save(sender, instance, *args, **kwargs):
        if instance.pk is None:
            instance.uuid = uuid.uuid4()

That way, the model/data is populated whatever way you create the model (via shell, fixtures, whatever).

ANSWER 2

Score 2

Automatically loading initial data fixtures is deprecated in Django 1.7. One solution is via signals as you mentioned. Another one that I prefer is to create a python script where you create all the needed data, and execute it in the shell:

python manage.py shell < create_initial_data.py

ANSWER 3

Score 1

I think that the problem is when you put default=uuid.uuid4(). The parenthesis are too much, because they imply that you pass the result of uuid.uuid4() to default argument and not the function itself, so you should put default=uuid.uuid4.