`Input should be a valid string` for integer keys in openapi.yaml

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#1,333 opened on Oct 10, 2025 1 comment 4 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: openapi, python
Domain: tooling

Research direction

Start by reproducing the failure with the linked openapi.yaml and openapi-python-client 0.26.2, focusing on the response key at paths./api/events.get.responses.200. The work is done when integer keys are accepted during class generation and treated as strings instead of producing the Pydantic validation error.

Written by the indexing model from the issue text.

Description

Describe the bug
When generating classes from openapi.yaml with integers as keys (e.g. 200), I get the error:

paths./api/events.get.responses.200.[key]
  Input should be a valid string [type=string_type, input_value=200, input_type=int]
    For further information visit https://errors.pydantic.dev/2.12/v/string_type

Is there a chance to ignore those errors and fall back to string for integer keys?

OpenAPI Spec File
Link to an OpenAPI document

Desktop (please complete the following information):

OS: macOS 26.0.1
Python Version: 13.3
openapi-python-client version: 0.26.2

Dominant language: Python
Stars: 2k
Forks: 293
Avg merge: 34m
Merged PRs (30d): 1

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