{
  "id": "python/flask-config-key-missing",
  "signature": "KeyError: 'DATABASE_URL'",
  "signature_zh": "键错误：'DATABASE_URL'",
  "regex": "KeyError:\\ 'DATABASE_URL'",
  "domain": "python",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Flask配置字典中缺少必需的配置键",
  "root_cause_type": "generic",
  "root_cause_zh": "Flask配置字典中缺少必需的配置键",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "使用默认值但未检查环境变量",
      "why_fails": "默认值可能不适用于生产环境",
      "fail_rate": 0.5,
      "condition": "",
      "sources": []
    },
    {
      "action": "在代码中硬编码配置值",
      "why_fails": "硬编码不利于配置管理",
      "fail_rate": 0.4,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "在配置加载时设置默认值",
      "success_rate": 0.9,
      "how": "app.config.setdefault('DATABASE_URL', 'sqlite:///default.db')",
      "condition": "",
      "sources": []
    },
    {
      "action": "使用环境变量并设置默认",
      "success_rate": 0.95,
      "how": "import os\napp.config['DATABASE_URL'] = os.environ.get('DATABASE_URL', 'sqlite:///dev.db')",
      "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": "2024-02-01",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}