{
  "id": "python/sqlalchemy-circular-dependency",
  "signature": "sqlalchemy.exc.InvalidRequestError: One or more mappers failed to initialize - can't proceed with initialization of other mappers. Original exception was: Circular dependency detected.",
  "signature_zh": "sqlalchemy.exc.InvalidRequestError：一个或多个映射器初始化失败——无法继续初始化其他映射器。原始异常为：检测到循环依赖。",
  "regex": "sqlalchemy\\.exc\\.InvalidRequestError:\\ One\\ or\\ more\\ mappers\\ failed\\ to\\ initialize\\ \\-\\ can't\\ proceed\\ with\\ initialization\\ of\\ other\\ mappers\\.\\ Original\\ exception\\ was:\\ Circular\\ dependency\\ detected\\.",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Circular relationships between models without proper back_populates or use of lazy='dynamic'.",
  "root_cause_type": "generic",
  "root_cause_zh": "模型之间存在循环关系，未正确使用 back_populates 或 lazy='dynamic'。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "Removing one relationship entirely.",
      "why_fails": "Loses necessary data access patterns.",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    },
    {
      "action": "Setting both relationships to lazy='noload'.",
      "why_fails": "Prevents loading but may break application logic.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Use back_populates correctly.",
      "success_rate": 0.95,
      "how": "class Parent(Base):\n    children = relationship('Child', back_populates='parent')\nclass Child(Base):\n    parent_id = Column(ForeignKey('parents.id'))\n    parent = relationship('Parent', back_populates='children')",
      "condition": "",
      "sources": []
    },
    {
      "action": "Use lazy='dynamic' on one side.",
      "success_rate": 0.9,
      "how": "children = relationship('Child', back_populates='parent', lazy='dynamic')",
      "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": "2024-11-12",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}