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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Multi-query parameter validation not working","articleBody":"Validation for query parameter with multiple values (i.e. array values in form-style query expansion) not working, at least from version `0.13.3` of `openapi-core`.\r\n\r\nExample request:\r\n```\r\nhttp://localhost:8000/v1/test?a=1\u0026a=2\r\n```\r\n\r\nAppropriate OpenAPI spec to validate above parameters as `a = ['1', '2']`:\r\n```\r\nparameters:\r\n  - in: query\r\n    name: a\r\n    description: Test query parameter.\r\n    schema:\r\n      type: array\r\n      items:\r\n        type: string\r\n    required: true\r\n```\r\n\r\nValidation error:\r\n```\r\nopenapi_core.unmarshalling.schemas.exceptions.InvalidSchemaValue: Value [['1', '2']] not valid for schema of type array: (\u003cValidationError: \"['1', '2'] is not of type string\"\u003e,)\r\n```\r\n\r\nTill version `0.13.8` it was possible to \"cheat\" validation by describing schema as:\r\n```\r\nparameters:\r\n  - in: query\r\n    name: a\r\n    description: Test query parameter.\r\n    schema: {}\r\n    required: true\r\n```\r\n\r\nUnfortunately, above workaround not working anymore (from version `0.14.0`), but strangely, schema can be described as follows:\r\n```\r\nparameters:\r\n  - in: query\r\n    name: a\r\n    description: Test query parameter.\r\n    schema:\r\n      type: array\r\n      items:\r\n        type: array\r\n        items:\r\n          type: string\r\n    required: true\r\n```\r\n\r\nHowever, this is not proper way to describe query parameter with multiple values and should be fixed!","author":{"url":"https://github.com/stojan-jovic","@type":"Person","name":"stojan-jovic"},"datePublished":"2021-06-27T01:46:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/366/openapi-core/issues/366"}