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Error on double underscore ordering with CursorPagination. Refs #3221.
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@ -665,6 +665,11 @@ class CursorPagination(BasePagination):
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'Using cursor pagination, but no ordering attribute was declared '
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'on the pagination class.'
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)
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assert '__' not in ordering, (
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'Cursor pagination does not support double underscore lookups '
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'for orderings. Orderings should be an unchanging, unique or '
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'nearly-unique field on the model, such as "-created" or "pk".'
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)
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assert isinstance(ordering, (six.string_types, list, tuple)), (
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'Invalid ordering. Expected string or tuple, but got {type}'.format(
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