{"record":{"id":"6994af723ed2b9ba","repo":"zylon-ai/private-gpt","slug":"failed-to-inspect-the-database-schema-6994af","errorCode":null,"errorMessage":"Failed to inspect the database schema.","messagePattern":"Failed to inspect the database schema\\.","errorType":"exception","errorClass":"ValueError","httpStatus":400,"severity":"error","filePath":"private_gpt/components/database/view_inspector.py","lineNumber":20,"sourceCode":"\nfrom private_gpt.components.database.inspected_schema import InspectedView\nfrom private_gpt.components.database.inspector_interface import (\n    DatabaseObjectType,\n    InspectedDatabaseObject,\n)\nfrom private_gpt.components.database.table_like_inspector import (\n    DatabaseTableLikeInspector,\n)\n\n\nclass DatabaseViewInspector(DatabaseTableLikeInspector):\n    def get_inspector_type(self) -> str:\n        return DatabaseObjectType.VIEW\n\n    def get_objects(self, schema: str) -> list[InspectedDatabaseObject]:\n        meta = inspect(self._engine)\n        if not meta:\n            raise ValueError(\"Failed to inspect the database schema.\")\n        views = sorted(meta.get_view_names(schema=schema))\n        result: list[InspectedDatabaseObject] = []\n\n        for view_name in views:\n            result.append(self._extract_schema(schema, view_name, InspectedView))\n\n        return result\n","sourceCodeStart":2,"sourceCodeEnd":28,"githubUrl":"https://github.com/zylon-ai/private-gpt/blob/4a030776a31a901ad80b1bf4d7faa2c1a367efbb/private_gpt/components/database/view_inspector.py#L2-L28","documentation":"ValueError raised in DatabaseViewInspector.get_objects, the view-side twin of the table inspector: if inspect(self._engine) is falsy it aborts before meta.get_view_names(schema=schema). Identical defensive guard, identical meaning — the engine could not be introspected at all, and the generic message hides the root cause.","triggerScenarios":"Calling get_objects(schema) on a DatabaseViewInspector with a dead or misconfigured engine, so inspect() yields nothing before view names are enumerated.","commonSituations":"Same class of issues as the table inspector: dropped connections, wrong DSN, driver/SQLAlchemy mismatch, or test doubles returning falsy inspectors. Shows up when only the view listing is exercised (e.g. UI tab that lists views first).","solutions":["Test the engine with a trivial query before calling get_objects","Restore/verify connectivity (database up, credentials valid, network reachable) and retry","Align SQLAlchemy and DB driver versions if inspection broke after an upgrade","Use a real Inspector (or a faithful fake) in tests instead of None"],"exampleFix":"# before\nviews = view_inspector.get_objects('public')  # ValueError: Failed to inspect the database schema.\n\n# after\nwith engine.connect() as c:\n    c.execute(text('SELECT 1'))\nviews = view_inspector.get_objects('public')","handlingStrategy":"try-catch","validationCode":"from sqlalchemy import text\n\nwith engine.connect() as c:\n    c.execute(text('SELECT 1'))  # catch dead engines before view listing","typeGuard":null,"tryCatchPattern":"try:\n    views = view_inspector.get_objects(schema)\nexcept ValueError as e:\n    if str(e) == 'Failed to inspect the database schema.':\n        engine.dispose()  # recycle pool, then one retry\n        views = view_inspector.get_objects(schema)\n    else:\n        raise","preventionTips":["Validate engine health before any get_objects call","Pin compatible SQLAlchemy + driver versions to keep inspect() reliable","Treat this generic message as a symptom — always check logs for the underlying driver error"],"tags":["database","sqlalchemy","schema-introspection","views","connection"],"backgroundTag":null,"analyzedSha":"4a030776a31a901ad80b1bf4d7faa2c1a367efbb","analyzedAt":"2026-08-15T03:51:26.951Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}