Enum.from_enum() fails with Django IntegerChoices

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#1,541 opened on Apr 2, 2024 0 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 45/100

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

Research direction

Start at graphene.Enum.from_enum() and the generated GrapheneEnumType behavior, using the provided Django IntegerChoices example to reproduce the failure. Compare the handling of TextChoices with IntegerChoices; the work is done when values such as 1, 2, and 9 can be represented by the generated Graphene enum without the reported error.

Written by the indexing model from the issue text.

Description

🐛 bug

Current Behavior

I am working in a Django Python codebase that has a GraphQL schema. A lot of TextChoices are used in our GraphQL schema and, to properly represent these we use the provided graphene.Enum.from_enum() function.

This same approach doesn't seem to work with Django's IntegerChoices. It seems when graphene generates a GrapheneEnumType, the values are created with the IntegerChoices member names. This makes it so the IntegerChoices value cannot be represented with the generated GrapheneEnumType.

This results in an error like the following:
"Enum 'Status' cannot represent value: 2"

Expected Behavior

A value from a Django IntegerChoices object is usable to get the appropriate GrapheneEnumType value name.

motivation

To allow for graphene.Enum.from_enum() to be usable by Django's IntegerChoices class.

Environment

Graphene Version: 3.3
Graphene Django Version: 3.2.0
Graphene Version: 3.3
Django Version: 4.1.12
Python Version: 3.10

Code Example

class Status(models.IntegerChoices):
    COMPLETED = 1, "Completed"
    IN_PROGRESS = 2, "In progress"
    ERRORED = 9, "Errored"


StatusChoices = graphene.Enum.from_enum(Status)

class Process(graphene.ObjectType):
    reference = graphene.String(description="The process reference.")
    status = graphene.Field(
        StatusChoices,
        description="Current process status.",
    )

This results in an error like the following:
"Enum 'Status' cannot represent value: 2"

Dominant language: Python
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