{
  "schema": {
    "bsonType": "object",
    "required": ["code", "name"],
    "properties": {
      "_id": {
        "description": "ID，系统自动生成"
      },
      "code": {
        "bsonType": "string",
        "description": "编码",
        "parentKey": "parent_code"
      },
      "parent_code": {
        "bsonType": "string",
        "description": "父级编码"
      },
      "name": {
        "bsonType": "string",
        "description": "城市名称",
        "title": "城市"
      },
      "type": {
        "bsonType": "int",
        "description": "城市类型；0省，1市，2区"
      },
      "letter": {
        "bsonType": "string",
        "description": "拼音首字母"
      },
      "pinyin": {
        "bsonType": "string",
        "description": "城市名称的完整汉语拼音，用于拼音检索"
      },
      "zip_code": {
        "bsonType": "string",
        "description": "邮政编码",
        "title": "邮编"
      }
    }
  },
  "index": [
    {
      "IndexName": "code_",
      "MgoKeySchema": {
        "MgoIndexKeys": [{
          "Name": "code",
          "Direction": "1"
        }],
        "MgoIsUnique": true
      }
    },
    {
      "IndexName": "name",
      "MgoKeySchema": {
        "MgoIndexKeys": [{
          "Name": "name",
          "Direction": "1"
        }],
        "MgoIsUnique": false
      }
    },
    {
      "IndexName": "letter",
      "MgoKeySchema": {
        "MgoIndexKeys": [{
          "Name": "letter",
          "Direction": "1"
        }],
        "MgoIsUnique": false
      }
    },
    {
      "IndexName": "pinyin",
      "MgoKeySchema": {
        "MgoIndexKeys": [{
          "Name": "name",
          "Direction": "1"
        }],
        "MgoIsUnique": false
      }
    },
    {
      "IndexName": "parent_code",
      "MgoKeySchema": {
        "MgoIndexKeys": [{
          "Name": "parent_code",
          "Direction": "1"
        }],
        "MgoIsUnique": false
      }
    },
    {
      "IndexName": "zip_code",
      "MgoKeySchema": {
        "MgoIndexKeys": [{
          "Name": "zip_code",
          "Direction": "1"
        }],
        "MgoIsUnique": false
      }
    }
  ]
}