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@Elawphant
Description
PolymorphicResourceRelatedField serializer throws 'str' object has no attribute 'get_polymorphic_types', if the referenced serializer is declared before the referencing serializer.
class ASerializer(ModelSerializer):
...
class BSerializer(ModelSerializer):
A = PolymorphicResourceRelatedField(
'module.serializers.ASerializer',
) # <- this one raises 'str' object has no attribute 'get_polymorphic_types', to avoid it we have to reference the class directly ASerializer
C = PolymorphicResourceRelatedField(
'module.serializers.ASerializer', # <- this one does not raise error
)
class CSerializer(ModelSerializer):
...
'module.serializers.ASerializer' should be the preferred way of referencing other serializers to avoid circular imports.
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