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'TypeError：无法初始化未定义的连接器：无法读取未定义的属性'root'

• 问答

我正在使用 loopback3.x 。我想将第三方API与回送集成。为此，在使用loopback-connector-rest时显示错误' TypeError：无法初始化未定义的连接器：无法读取未定义的属性'root''。如何解决？

数据源配置

   "restDataSource": {
    "name": "restDataSource","baseURL": "","crud": true,"connector": "rest","debug": false,"options": {
      "headers": {
        "accept": "application/json","content-type": "application/json","authorization": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
      },"strictSSL": false
    },"operations": [{
      "template": {
        "method": "POST","url": "https://fcm.googleapis.com/fcm/send","options": {
          "strictSSL": true,"useQuerystring": true
        }
      },"functions": {
        "notify": ["title","text","click_action","keyname","to"]
      }
    }]
  }

错误 

TypeError: Cannot create data source "restDataSource": Cannot initialize connector "rest": Cannot read property 'root' of undefined
    at /home/veena-msl/Documents/care-doc-api/node_modules/loopback-connector-rest/lib/rest-connector.js:93:28
    at Array.forEach (<anonymous>)
    at /home/veena-msl/Documents/care-doc-api/node_modules/loopback-connector-rest/lib/rest-connector.js:87:22
    at Array.forEach (<anonymous>)
    at Function.initializeDataSource [as initialize] (/home/veena-msl/Documents/care-doc-api/node_modules/loopback-connector-rest/lib/rest-connector.js:52:25)
    at DataSource.setup (/home/veena-msl/Documents/care-doc-api/node_modules/loopback-datasource-juggler/lib/datasource.js:493:19)
    at new DataSource (/home/veena-msl/Documents/care-doc-api/node_modules/loopback-datasource-juggler/lib/datasource.js:138:8)
    at Registry.createDataSource (/home/veena-msl/Documents/care-doc-api/node_modules/loopback/lib/registry.js:364:12)
    at dataSourcesFromConfig (/home/veena-msl/Documents/care-doc-api/node_modules/loopback/lib/application.js:570:19)
    at Function.app.dataSource (/home/veena-msl/Documents/care-doc-api/node_modules/loopback/lib/application.js:269:14)
    at /home/veena-msl/Documents/care-doc-api/node_modules/loopback-boot/lib/executor.js:191:9
    at /home/veena-msl/Documents/care-doc-api/node_modules/loopback-boot/lib/executor.js:282:5
    at Array.forEach (<anonymous>)
    at forEachKeyedObject (/home/veena-msl/Documents/care-doc-api/node_modules/loopback-boot/lib/executor.js:281:20)
    at setupDataSources (/home/veena-msl/Documents/care-doc-api/node_modules/loopback-boot/lib/executor.js:181:3)
    at execute (/home/veena-msl/Documents/care-doc-api/node_modules/loopback-boot/lib/executor.js:39:3)
holly00 回答：'TypeError：无法初始化未定义的连接器：无法读取未定义的属性'root'

在functions部分中，您定义了一个函数notify，该函数接受多个输入参数：title，text，click_action，keyname ，to。但是，template部分未提供有关如何将这些参数映射到HTTP请求的任何信息。例如，title应该通过URL查询还是在请求正文中发送？

IIUC，您正在尝试使用旧的Firbase Cloud Messaging HTTP API，如下所述：https://firebase.google.com/docs/cloud-messaging/http-server-ref根据该文档，我认为您函数的所有参数都应在请求正文中发送。

当输入参数未映射到任何HTTP源时，LoopBack的REST连接器似乎无法正确检测和处理这种情况。它应该不会崩溃，请随时在https://github.com/strongloop/loopback-connector-rest/issues

中打开错误报告

这是不会使服务器崩溃的配置。我没有Firebase帐户来验证它是否按预期工作。

    "template": {
      "method": "POST","url": "https://fcm.googleapis.com/fcm/send","options": {
        "strictSSL": true,"useQuerystring": true
      },"body": {
        "title": "{title:string}","text": "{text:string}","click_action": "{click_action:string}","keyname": "{keyname:string}","to": "{to:string}"
      }
    },

您可以在连接器文档中进一步了解如何配置输入参数的不同方式：https://loopback.io/doc/en/lb3/REST-connector.html#defining-a-custom-method-using-a-template

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