{
  "id": "python/fastapi-pydantic-v2-orm-mode",
  "signature": "pydantic.errors.PydanticUserError: `from_orm` is deprecated; use `model_validate` with `from_attributes=True`",
  "signature_zh": "pydantic.errors.PydanticUserError: `from_orm`已弃用；请使用`model_validate`并设置`from_attributes=True`",
  "regex": "pydantic\\.errors\\.PydanticUserError:\\ `from_orm`\\ is\\ deprecated;\\ use\\ `model_validate`\\ with\\ `from_attributes=True`",
  "domain": "python",
  "category": "install_error",
  "subcategory": null,
  "root_cause": "Pydantic v1 API used with Pydantic v2 installed, typically after upgrading FastAPI.",
  "root_cause_type": "generic",
  "root_cause_zh": "在安装了Pydantic v2的情况下使用了Pydantic v1 API，通常是升级FastAPI后。",
  "versions": [
    {
      "version": "2.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "FastAPI >=0.100 requires pydantic v2; other errors appear.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "orm_mode is a v1 setting; ignored in v2.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.95,
      "how": "class UserOut(BaseModel):\\n    model_config = ConfigDict(from_attributes=True)\\n    id: int",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.9,
      "how": "UserOut.model_validate(user_obj)",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-03-30",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}