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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Schemas in query parameters don't work","articleBody":"### Actual Behavior\n\nQuery parameters with schemas are ignored when Unmarshalling \n\n### Expected Behavior\n\nQuery parameters matching a query parameter with a schema should be included in Unmarshall results.\n\n### Steps to Reproduce\n\nSchema:\n```yaml\nopenapi: 3.1.0\ninfo:\n    title: Example\n    version: \"0.0\"\nservers:\n  - url: 'http://example.com'\npaths:\n  /:\n    get:\n      parameters:\n        - name: tag.{name}\n          in: query\n          schema:\n              type: object\n              patternProperties:\n                  '^tag\\.[A-Za-z0-9]+$':\n                      type: string\n                      pattern: '^[A-Za-z0-9]+$'\n                  additionalProperties: false\n        - name: baz\n          in: query\n          schema:\n            type: string\n```\n\nPython script:\n```python\nfrom openapi_core import OpenAPI\nfrom openapi_core.contrib.requests import RequestsOpenAPIRequest\nfrom requests import Request\nimport re\n\noas = OpenAPI.from_file_path('./exampleOas.yaml')\nreq = oas.unmarshal_request(RequestsOpenAPIRequest(Request(\n    \"GET\",\n    \"http://example.com/\",\n    params={\"tag.foo\": \"bar\", \"baz\": \"bat\"})))\n\nprint(req)\n# Returns\n# RequestUnmarshalResult(errors=[], body=None, parameters=Parameters(query={'baz': 'bat'}, header={}, cookie={}, path={}), security={})\n\n# Prove the regex works\nprint(re.search(r\"^tag\\.[A-Za-z0-9]+$\", \"tag.foo\"))\n# Returns\n# \u003cre.Match object; span=(0, 7), match='tag.foo'\u003e\n```\n\n### OpenAPI Core Version\n\n0.19.5\n\n### OpenAPI Core Integration\n\nrequests\n\n### Affected Area(s)\n\nunmarshalling \n\n### References\n\nSuch a pattern is described [here](https://github.com/OAI/OpenAPI-Specification/issues/2622#issuecomment-863916567) and I've had confirmation on the OpenAPI slack [here](https://open-api.slack.com/archives/C0EDH2QKD/p1755211848023869?thread_ts=1754309646.541589\u0026cid=C0EDH2QKD) that this is the current best approach to describing pattern-based query parameter names.\n\nThis may be related to https://github.com/python-openapi/openapi-core/issues/250 but isn't completely related as it should work with the query default style of `form`.\n\n[Example of the use case](https://bbc.github.io/tams/main/index.html#/operations/GET_flows#Query-Parameters) I have for this.\n\n### Anything else we need to know?\n\n_No response_\n\n### Would you like to implement a fix?\n\nNone","author":{"url":"https://github.com/j616","@type":"Person","name":"j616"},"datePublished":"2025-08-21T14:49:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/1022/openapi-core/issues/1022"}