大家好，这是我第一次使用loopback进行开发 .

我在loopback中遇到关系概念的问题，直到现在让我感到困惑，我有这样的关系 .

One City Has Many Merchant 
One Merchant Belongs To City

然后我像这样在loopback上实现：
City Model

{
          "name": "city",
          "base": "PersistedModel",
          "idInjection": true,
          "options": {
            "validateUpsert": true,
            "mysql": {
              "table": "city"
            }
          },
          "properties": {
            "id": {
              "type": "number",
              "id": true,
              "required": true,
              "mysql": {
                "columnName": "id",
                "dataType": "INT",
                "dataLength": 11
              }
            },
            "name": {
              "type": "string",
              "required": true
            },
            "isDelete": {
              "type": "number",
              "required": true,
              "default": 1
            }
          },
          "validations": [],
          "relations": {
            "merchants": {
              "type": "hasMany",
              "model": "merchant",
              "foreignKey": "",
              "options": {
                "nestRemoting": true,
                "forceId": false
              },
              "scope": {
                "include": "city" 
              }
            }
          },
          "acls": [
            {
              "accessType": "*",
              "principalType": "ROLE",
              "principalId": "$everyone",
              "permission": "ALLOW"
            }
          ],
          "methods": {}
        }

Merchant Model

{
      "name": "merchant",
      "base": "PersistedModel",
      "idInjection": true,
      "options": {
        "mysql": {
          "table": "merchant"
        },
        "validateUpsert": true
      },
      "properties": {
        "id": {
          "type": "number",
          "id": true,
          "required": true,
          "mysql": {
            "columnName": "id",
            "dataType": "INT",
            "dataLength": 1
          }
        },
        "merchantName": {
          "type": "string",
          "required": true,
          "mysql": {
            "columnName": "merchantName",
            "dataType": "VARCHAR",
            "dataLength": 100
          }
        },
        "longitude": {
          "type": "string",
          "required": true,
          "mysql": {
            "columnName": "longitude",
            "dataType": "VARCHAR",
            "dataLength": 45
          }
        },
        "latitude": {
          "type": "string",
          "required": true,
          "mysql": {
            "columnName": "latitude",
            "dataType": "VARCHAR",
            "dataLength": 45
          }
        },
        "telephone": {
          "type": "string",
          "required": true,
          "mysql": {
            "columnName": "telephone",
            "dataType": "VARCHAR",
            "dataLength": 45
          }
        },
        "isDelete": {
          "type": "number",
          "required": true,
          "default": 1,
          "mysql": {
            "columnName": "isDelete",
            "dataType": "INT",
            "dataLength": 1
          }
        }
      },
      "validations": [],
      "relations": {
        "city": {
          "type": "belongsTo",
          "model": "city",
          "foreignKey": ""
        }
      },
      "acls": [
        {
          "accessType": "*",
          "principalType": "ROLE",
          "principalId": "$everyone",
          "permission": "ALLOW"
        }
      ],
      "methods": {}
    }

然后我可以使用包含在这样的查询网址获取城市中的商家列表 .

list merchant in city
但我不能像这样在商人那里得到细节之城 .

query get merchant

那么如何在商家中获得细节城市？

loopback