{"record":{"id":"6f28f63f8180808b","repo":"HKUDS/Vibe-Trading","slug":"entity-self-entity-id-r-cannot-be-its-own-parent","errorCode":null,"errorMessage":"entity {self.entity_id!r} cannot be its own parent","messagePattern":"entity (.+?) cannot be its own parent","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"agent/src/entities/models.py","lineNumber":178,"sourceCode":"        \"\"\"Validate identifiers and coerce ``entity_type`` to its enum member.\n\n        Raises:\n            ValueError: If ``entity_id`` is blank or ``entity_type`` is unknown.\n        \"\"\"\n        cleaned = self.entity_id.strip() if isinstance(self.entity_id, str) else \"\"\n        if not cleaned:\n            raise ValueError(\"entity_id is required and cannot be empty\")\n        object.__setattr__(self, \"entity_id\", cleaned)\n        object.__setattr__(self, \"name\", self.name.strip() if self.name else \"\")\n        try:\n            object.__setattr__(self, \"entity_type\", EntityType(self.entity_type))\n        except ValueError as exc:\n            valid = \", \".join(member.value for member in EntityType)\n            raise ValueError(\n                f\"unknown entity_type {self.entity_type!r}; expected one of: {valid}\"\n            ) from exc\n        if self.parent_id is not None and self.parent_id == self.entity_id:\n            raise ValueError(f\"entity {self.entity_id!r} cannot be its own parent\")\n\n\n@dataclass(frozen=True)\nclass Instrument:\n    \"\"\"Base class for anything that can be held and analysed.\n\n    Subclasses add asset-class specifics; they may only add fields *with*\n    defaults, because the base already declares defaulted fields.\n\n    Attributes:\n        instrument_id: Stable identifier, e.g. an ISIN, a ticker, or a local key.\n        currency: Required ISO-style currency code of this instrument's cash\n            flows. Normalized to uppercase.\n        name: Human-readable name.\n        issuer: The entity on the hook for the instrument's obligations.\n        inception_date: First date the instrument existed, when known.\n    \"\"\"\n","sourceCodeStart":160,"sourceCodeEnd":196,"githubUrl":"https://github.com/HKUDS/Vibe-Trading/blob/80ffdda44c5c4db0dd84d70e051cca591cea67df/agent/src/entities/models.py#L160-L196","documentation":"Entity.__post_init__ rejects entities whose parent_id equals their own entity_id, since an entity cannot be its own parent in the hierarchy. This guard prevents trivially circular self-referencing trees.","triggerScenarios":"Creating an Entity where parent_id is set to the same value as entity_id (e.g. Entity(entity_id='acme', parent_id='acme')). Also occurs after id normalization/aliasing makes two originally distinct ids equal.","commonSituations":"Bulk imports where a self-referencing row exists in a CSV; upstream id remapping or deduplication that maps a parent onto the child itself; defaulting parent_id to entity_id as a placeholder.","solutions":["Set parent_id=None for root/top-level entities instead of self","Audit the source data for rows where parent == child and drop or null them before constructing objects","If ids were remapped, re-run parent resolution after remapping so parents and children use the new id space"],"exampleFix":"# before\nEntity(entity_id='acme', entity_type='company', parent_id='acme')\n\n# after\nEntity(entity_id='acme', entity_type='company', parent_id=None)","handlingStrategy":"validation","validationCode":"iid = row['entity_id'].strip()\nparent = (row.get('parent_id') or '').strip() or None\nif parent == iid:\n    parent = None  # root entity\nentity = Entity(entity_id=iid, entity_type=t, parent_id=parent)","typeGuard":null,"tryCatchPattern":"try:\n    Entity(entity_id=iid, entity_type=t, parent_id=parent)\nexcept ValueError as exc:\n    if 'cannot be its own parent' in str(exc):\n        parent = None\n        entity = Entity(entity_id=iid, entity_type=t, parent_id=None)\n    else:\n        raise","preventionTips":["Treat parent_id == entity_id as a root in your loader","Validate hierarchy edges (no self-loops) before batch construction","Re-resolve parent ids after any id remapping"],"tags":["python","dataclass","tree-structure","entities"],"backgroundTag":"self-reference-validation","analyzedSha":"80ffdda44c5c4db0dd84d70e051cca591cea67df","analyzedAt":"2026-08-28T12:46:38.989Z","schemaVersion":2},"datasetVersion":"2026-08-28T16:17:29.566Z"}