{
  "id": "python/flask-url-parameter-type-conversion",
  "signature": "werkzeug.routing.exceptions.BuildError: Could not build url for endpoint 'user' with values ['user_id']",
  "signature_zh": "Werkzeug路由异常：无法为端点'user'构建URL，缺少参数'user_id'",
  "regex": "werkzeug\\.routing\\.exceptions\\.BuildError:\\ Could\\ not\\ build\\ url\\ for\\ endpoint\\ 'user'\\ with\\ values\\ \\['user_id'\\]",
  "domain": "python",
  "category": "runtime_error",
  "subcategory": null,
  "root_cause": "url_for函数缺少必需的路径参数",
  "root_cause_type": "generic",
  "root_cause_zh": "url_for函数缺少必需的路径参数",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "尝试使用默认参数值",
      "why_fails": "路径参数没有默认值，必须提供",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    },
    {
      "action": "修改路由定义以忽略参数",
      "why_fails": "路由定义变更影响所有调用点",
      "fail_rate": 0.3,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "在url_for中提供所有必需参数",
      "success_rate": 0.95,
      "how": "url_for('user', user_id=123)",
      "condition": "",
      "sources": []
    },
    {
      "action": "为路由参数设置默认值",
      "success_rate": 0.9,
      "how": "@app.route('/user/<int:user_id>', defaults={'user_id': 1})",
      "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": 0.86,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-03-05",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}