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from django.db import models
MAX_INSTANCES = 10
class MyModel(models.Model):
foo = models.BooleanField()
bar = models.IntegerField(help_text='Must be an integer.')
baz = models.CharField(max_length=32, help_text='Free text. Max length 32 chars.')
created = models.DateTimeField(auto_now_add=True)
def save(self, *args, **kwargs):
"""
For the purposes of the sandbox limit the maximum number of stored models.
"""
super(MyModel, self).save(*args, **kwargs)
while MyModel.objects.all().count() > MAX_INSTANCES:
MyModel.objects.all().order_by('-created')[0].delete()
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