Enum default_value serialization issue

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#166 opened on Mar 20, 2018 4 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 38/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: graphql, python
Domain: api, backend

Research direction

Start by reproducing the enum argument default_value examples and tracing how default values are serialized during schema introspection. Compare the result with graphql-js behavior; done means an enum default is emitted as its name without escaped string quotes and can be consumed by graphql-tools schema stitching.

Written by the indexing model from the issue text.

Description

Originally reported in graphene issue #691

Argument default_value serializes enum value instead of name. graphql spec does not support enum values and graphql-js serializes enums to the name not value. graphql-python is not consistent with graphql-js. I attempted to find a workaround by setting the enum value to a string of the name but teh result is a string that includes escaped quotes.

Using the name of the enum doesn't work:

class MyEnum(graphene.Enum):
    FOO=0
    BAR=1

foobar = graphene.List(FooBar, my_enum=graphene.Argument(MyEnum, default_value=MyEnum.FOO.name))

This results in the defaultValue being "\"FOO\"". This does not follow the graphql spec for enums and breaks with third party introspection. Specifically i'm trying to stitch a graphene remote schema and the invalid defaultValue results in a null returned in the merged schema (using graphql-tools).

Using a string value doesn't work either:

class MyEnum(graphene.Enum):
    FOO="FOO"
    BAR="BAR"

This also doesn't work with using MyEnum.FOO.value for default_value nor setting it specifically to the static string "FOO".

I tried looking for how default_value gets resolved for enums but haven't been able to track it down. I think if we can just get the string value for default_value to not include the escaped string quotes then my schema stitching will work. I haven't been able to figure out how to define an enum so that this will happen.

Dominant language: Python
Stars: 371
Forks: 175
PR merge metrics: No merged PRs in 30d

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