{
  "id": "python/sqlalchemy-missing-primary-key",
  "signature": "sqlalchemy.exc.ArgumentError: Mapper Mapper|User|users could not assemble any primary key columns for mapped table 'users'",
  "signature_zh": "sqlalchemy.exc.ArgumentError：映射器 Mapper|User|users 无法为映射表 'users' 组装任何主键列",
  "regex": "sqlalchemy\\.exc\\.ArgumentError:\\ Mapper\\ Mapper\\|User\\|users\\ could\\ not\\ assemble\\ any\\ primary\\ key\\ columns\\ for\\ mapped\\ table\\ 'users'",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Model class lacks a primary key column definition.",
  "root_cause_type": "generic",
  "root_cause_zh": "模型类缺少主键列定义。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Adding a column without primary_key=True.",
      "why_fails": "SQLAlchemy requires explicit primary key constraint.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    },
    {
      "action": "Using composite primary key with non-unique columns.",
      "why_fails": "Must ensure uniqueness; otherwise mapping fails.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Add a primary key column.",
      "success_rate": 0.95,
      "how": "class User(Base):\n    __tablename__ = 'users'\n    id = Column(Integer, primary_key=True)",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use __mapper_args__ to specify primary key from existing columns.",
      "success_rate": 0.9,
      "how": "class User(Base):\n    __tablename__ = 'users'\n    email = Column(String, primary_key=True)  # if email is unique",
      "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": 0.85,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2025-02-14",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}