serializers.py 文件源码

def validate(self, data):
        if 'start' in data and 'end' in data:
            if data['start'] > data['end']:
                raise serializers.ValidationError('Start date must be after end date')
        if not self.instance:
            date_range = DateTimeTZRange(data['start'], data['end'])
            overlaps = EquipmentReservation.objects.filter(
                reservation__overlap=date_range,
                equipment_reserved=data['equipment_reserved']).count()
            if overlaps > 0:
                raise serializers.ValidationError(
                    'Equipment has already been reserved during this time period')
        return data