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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Attempted to generate duplicate models with name \"TypenameFieldnameItem\"","articleBody":"**Describe the bug**\nI stumbled on a weirdly specific bug that causes the generator to attempt to generate duplicate models.\n\nApparently we need:\n- a OneOf type (A), which references an Object type (B)\n- An object type (B) with an array-of-object field\n- An Object type (C) for the array-of-object field\n- array-of-C and C must be declared inline inside B\n\n**OpenAPI Spec File**\n\nThis works\n```\nopenapi: 3.0.3\ninfo:\n  title: Minimal example for error \"Attempted to generate duplicate models\"\n  version: 1.0.0\n\ncomponents:\n  schemas:\n    Result:\n      oneOf:\n        - $ref: \"#/components/schemas/ResultA\"\n      discriminator:\n        propertyName: type\n        mapping:\n          \"A\": \"#/components/schemas/ResultA\"\n\n    ResultA:\n      type: object\n      properties:\n        things:\n          type: array\n          items:\n            $ref: \"#/components/schemas/ResultAThingsItem\"\n\n    ResultAThingsItem:\n      type: object\n      properties:\n        name:\n          type: string\n\npaths:\n  /something:\n    get:\n      summary: Returns a list of users.\n      responses:\n        '200':\n          description: A successful response returning the list of users.\n          content:\n            application/json:\n              schema:\n                $ref: '#/components/schemas/Result'\n```\n\nThis should be the same, but doesn't work:\n\n```\nopenapi: 3.0.3\ninfo:\n  title: Minimal example for error \"Attempted to generate duplicate models\"\n  version: 1.0.0\n\ncomponents:\n  schemas:\n    Result:\n      oneOf:\n        - $ref: \"#/components/schemas/ResultA\"\n      discriminator:\n        propertyName: type\n        mapping:\n          \"A\": \"#/components/schemas/ResultA\"\n\n    ResultA:\n      type: object\n      properties:\n        things:\n          type: array\n          items:\n            type: object\n            properties:\n              name:\n                type: string\n\npaths:\n  /something:\n    get:\n      summary: Returns a list of users.\n      responses:\n        '200':\n          description: A successful response returning the list of users.\n          content:\n            application/json:\n              schema:\n                $ref: '#/components/schemas/Result'\n\nOutput:\n```\n$ pipx run openapi-python-client generate --path=example.yaml --overwrite\nGenerating \u003c...\u003e/minimal-example-for-error-attempted-to-generate-duplicate-models-client\nWarning(s) encountered while generating. Client was generated, but some pieces may be missing\n\nWARNING parsing GET /something within default.\n\nCannot parse response for status code 200 (Could not find reference in parsed models or enums), response will be omitted from generated client\n\nReference(ref='#/components/schemas/Result')\n\n\nUnable to process schema /components/schemas/Result:\n\nAttempted to generate duplicate models with name \"ResultAThingsItem\"\n\nFailure to process schema has resulted in the removal of:\n/components/schemas/ResultA\n/components/schemas/Result\n\nSchema(title=None, multipleOf=None, maximum=None, exclusiveMaximum=None, minimum=None, exclusiveMinimum=None, maxLength=None, minLength=None, pattern=None, maxItems=None, minItems=None, uniqueItems=None, maxProperties=None, minProperties=None, required=None, enum=None, const=None, type=\u003cDataType.OBJECT: 'object'\u003e, allOf=[], oneOf=[], anyOf=[], schema_not=None, items=None, prefixItems=[], properties={'name': Schema(title=None, multipleOf=None, maximum=None, exclusiveMaximum=None, minimum=None, exclusiveMinimum=None, maxLength=None, minLength=None, pattern=None, maxItems=None, minItems=None, uniqueItems=None, maxProperties=None, minProperties=None, required=None, enum=None, const=None, type=\u003cDataType.STRING: 'string'\u003e, allOf=[], oneOf=[], anyOf=[], schema_not=None, items=None, prefixItems=[], properties=None, additionalProperties=None, description=None, schema_format=None, default=None, nullable=False, discriminator=None, readOnly=None, writeOnly=None, xml=None, externalDocs=None, example=None, deprecated=None)}, additionalProperties=None, description=None, schema_format=None, default=None, nullable=False, discriminator=None, readOnly=None, writeOnly=None, xml=None, externalDocs=None, example=None, deprecated=None)\n\nIf you believe this was a mistake or this tool is missing a feature you need, please open an issue at https://github.com/openapi-generators/openapi-python-client/issues/new/choose\n```\n\n\n**Desktop (please complete the following information):**\n - OS: Ubuntu 25.04\n - Python Version: 3.12.3\n - openapi-python-client version: 0.28.0\n","author":{"url":"https://github.com/paulo-raca","@type":"Person","name":"paulo-raca"},"datePublished":"2025-12-10T02:50:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1375/openapi-python-client/issues/1375"}