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Serializing native Python enums does not work #152

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@wichert

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@wichert

Currently using SQL enums works well, unless you use a enum.Enum as base for the enum. For example using this model:

class Hairkind(enum.Enum):
    LONG = 'long'
    SHORT = 'short'

class Pet(Base):
    __tablename__ = 'pets'
    id = Column(Integer(), primary_key=True)
    hair_kind = Column(Enum(Hairkind, name='hair_kind'), nullable=False)

will fail badly if you try to query the hairKind field:

  File "lib/python3.7/site-packages/graphql/execution/executor.py", line 622, in complete_leaf_value
    path=path,
graphql.error.base.GraphQLError: Expected a value of type "hair_kind" but received: Hairkind.LONG

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