bornhack-website/utils/models.py

import uuid
from django.core.exceptions import ValidationError
from django.db import models


class CleanedModel(models.Model):
    class Meta:
        abstract = True

    def save(self, **kwargs):
        try:
            # call this models full_clean() method before saving,
            # which in turn calls .clean_fields(), .clean() and .validate_unique()
            self.full_clean()
        except ValidationError as e:
            message = "Got ValidationError while saving: %s" % e
            if hasattr(self, 'request'):
                messages.error(self.request, message)
            print(message)
            # dont save, just return
            return
        super(CleanedModel, self).save(**kwargs)


class UUIDModel(CleanedModel):
    class Meta:
        abstract = True

    uuid = models.UUIDField(
        primary_key=True,
        default=uuid.uuid4,
        editable=False,
    )


class CreatedUpdatedModel(CleanedModel):
    class Meta:
        abstract = True

    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)