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

Question

我正在使用loopback3.x。我想将第三方API与环回集成。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)

Answer 1

在functions部分中，您定义了一个函数notify，它接受几个输入参数：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基于该文档，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

这里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了解有关如何配置输入参数的不同方法的更多信息：https://loopback.io/doc/en/lb3/REST-connector.html#defining-a-custom-method-using-a-template