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Diffstat (limited to 'patchwork/api/__init__.py')
-rw-r--r-- | patchwork/api/__init__.py | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/patchwork/api/__init__.py b/patchwork/api/__init__.py index e69de29..efc0dd8 100644 --- a/patchwork/api/__init__.py +++ b/patchwork/api/__init__.py @@ -0,0 +1,50 @@ +# Patchwork - automated patch tracking system +# Copyright (C) 2020, Stephen Finucane <stephen@that.guru> +# +# SPDX-License-Identifier: GPL-2.0-or-later + +from rest_framework.fields import empty +from rest_framework.fields import get_attribute +from rest_framework.fields import SkipField +from rest_framework.relations import ManyRelatedField + + +# monkey patch django-rest-framework to work around issue #7550 [1] until #7574 +# [2] or some other variant lands +# +# [1] https://github.com/encode/django-rest-framework/issues/7550 +# [2] https://github.com/encode/django-rest-framework/pull/7574 + +def _get_attribute(self, instance): + # Can't have any relationships if not created + if hasattr(instance, 'pk') and instance.pk is None: + return [] + + try: + relationship = get_attribute(instance, self.source_attrs) + except (KeyError, AttributeError) as exc: + if self.default is not empty: + return self.get_default() + if self.allow_null: + return None + if not self.required: + raise SkipField() + msg = ( + 'Got {exc_type} when attempting to get a value for field ' + '`{field}` on serializer `{serializer}`.\nThe serializer ' + 'field might be named incorrectly and not match ' + 'any attribute or key on the `{instance}` instance.\n' + 'Original exception text was: {exc}.'.format( + exc_type=type(exc).__name__, + field=self.field_name, + serializer=self.parent.__class__.__name__, + instance=instance.__class__.__name__, + exc=exc + ) + ) + raise type(exc)(msg) + + return relationship.all() if hasattr(relationship, 'all') else relationship + + +ManyRelatedField.get_attribute = _get_attribute |