[Python] Prevent DateRangeField overlap in Django model?

Now that Django supports the DateRangeField, is there a 'Pythonic' way to prevent records from having overlapping date ranges?

Hypothetical use case


One hypothetical use case would be a booking system, where you don't want people to book the same resource at the same time.

Hypothetical example code


class Booking(models.model):
# The resource to be reserved
resource = models.ForeignKey('Resource')
# When to reserve the resource
date_range = models.DateRangeField()

class Meta:
unique_together = ('resource', 'date_range',)

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