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explicitly importing QuerySet to fix failing import in older Django versions
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@ -8,6 +8,7 @@ object creation, and makes it possible to switch between using the implicit
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"""
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from __future__ import unicode_literals
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from django.db import models
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from django.db.models.query import QuerySet
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from django.utils.translation import ugettext_lazy as _
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from rest_framework.compat import unicode_to_repr
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from rest_framework.exceptions import ValidationError
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@ -132,7 +133,7 @@ class UniqueTogetherValidator:
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that instance itself as a uniqueness conflict.
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"""
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if self.instance is not None:
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if isinstance(self.instance, models.QuerySet):
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if isinstance(self.instance, QuerySet):
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return queryset.exclude(pk__in=self.instance.values_list('pk', flat=True))
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else:
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return queryset.exclude(pk=self.instance.pk)
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