[BUG] Python not serializing enums correctly

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What’s the actual output vs expected output?
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Description

I have an endpoint that accepts an enum as part of its request body. Whenever I pass Products.allowed_values[('value',)]["TRANSACTIONS"] as the value I get the failure:

E               name.exceptions.ApiTypeError: Invalid type for variable '0'. Required value type is Products and passed type was str at ['initial_products'][0]

Python model serialization fails when type is not Products('transactions').

openapi-generator version

Docker CLI v5

OpenAPI declaration file content or url

    initial_products:
      type: array
      items:
        $ref: '#/components/schemas/Products'
        
    Products:
      title: Products
      enum:
      - transactions
      type: string

Generation Details

docker run --rm -v /mydrive:/local openapitools/openapi-generator-cli:v5.0.0 generate -g python -i local/api.yml -o local/build/generated-python \
		-p packageName=name 

Steps to reproduce

Pass in Products('transactions') to the endpoint and get JSON as {value: 'transactions'}. Should be just 'transactions'.

Pass in Products.allowed_values[('value',)]["TRANSACTIONS"] and get the failure mentioned above.

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/7058

Suggest a fix

[spacether]

All merged

[cgfarmer4]

Thanks so much for jumping in to fix here @spacether. Will keep an eye on the merge.