使用Socket.io发出序列化结果时出错[Express，Socket.io，Sequelize]

Question

我在我的Express API上有一个简单的put请求，在我使用Sequelize ORM进行更新之后，我不能使用Socket.io发出。

我只能发出其他对象，例如，我可以发出这个{"hello"："world"}，但是我不能发出更新的结果。

下面是这段代码：

module.exports = {
  async update(req, res) {
    const { body } = req;
    const { task_id } = req.params;

    const task = await ProjectTask.findByPk(task_id);

    task.update({
      name: body.title,
      description: body.description,
    });


    req.io.emit('update', task); // Here it is the socket.io that brakes the code
    console.log(task); // this works 


    return res.json(task); // also this
  },
}

Error：(node:8923) UnhandledPromiseRejectionWarning: RangeError：_removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:99:24) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:126:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:99:24) at _removeBlobs (/Users/guifeliper )的最大调用堆栈大小超出了/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs _removeBlobs在(/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:的(/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130: at _removeBlobs _removeBlobs at _removeBlobs _removeBlobs9)在(/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.的(/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.的_removeBlobs _removeBlobs at _removeBlobs _removeBlobsjs:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) at _removeBlobs (/Users/guifeliper/nodejs/node_modules/socket.io-parser/binary.js:130:9) (节点:8923) UnhandledPromiseRejectionWarning: Unhandled rejection。此错误是由于在没有catch块的异步函数内部引发，或拒绝未使用.catch()处理的promise造成的。(拒绝id: 1) (节点:8923) DEP0018 DeprecationWarning:未处理的promise拒绝已弃用。将来，未处理的promise拒绝将使用非零退出代码终止Node.js进程。

编辑:会不会是因为项目格式？这是我们在任务变量上所拥有的：

{
  "id": 10971,
  "name": "Change the background image 5",
  "description": "save description 2",
  "dueEndDate": null,
  "status": 3,
  "deleted": {
    "type": "Buffer",
    "data": [
      0
    ]
  },
  "closed": {
    "type": "Buffer",
    "data": [
      0
    ]
  },
  "createdAt": "2019-12-18T16:06:57.000Z",
  "modifiedAt": "2019-12-21T14:43:39.000Z",
  "sprint_id": 41
}

未解析：

ProjectTask {
  dataValues:
   { id: 10971,
     name: 'Change the background image 5',
     description: 'save description 2',
     dueEndDate: null,
     status: 3,
     deleted: <Buffer 00>,
     closed: <Buffer 00>,
     createdAt: 2019-12-18T16:06:57.000Z,
     modifiedAt: 2019-12-21T14:43:39.000Z,
     sprint_id: 41 },
  _previousDataValues:
   { id: 10971,
     name: 'Change the background image 5',
     description: 'save description 2',
     dueEndDate: null,
     status: 3,
     deleted: <Buffer 00>,
     closed: <Buffer 00>,
     createdAt: 2019-12-18T16:06:57.000Z,
     modifiedAt: 2019-12-21T14:43:39.000Z,
     sprint_id: 41 },
  _changed: {},
  _modelOptions:
   { timestamps: true,
     validate: {},
     freezeTableName: true,
     underscored: false,
     paranoid: false,
     rejectOnEmpty: false,
     whereCollection: { id: '10971' },
     schema: null,
     schemaDelimiter: '',
     defaultScope: {},
     scopes: {},
     indexes: [],
     name: { plural: 'ProjectTasks', singular: 'ProjectTask' },
     omitNull: false,
     createdAt: 'createdAt',
     updatedAt: 'modifiedAt',
     sequelize:
      Sequelize {
        options: [Object],
        config: [Object],
        dialect: [MysqlDialect],
        queryInterface: [QueryInterface],
        models: [Object],
        modelManager: [ModelManager],
        connectionManager: [ConnectionManager],
        importCache: {} },
     hooks: {} },
  _options:
   { isNewRecord: false,
     _schema: null,
     _schemaDelimiter: '',
     raw: true,
     attributes:
      [ 'id',
        'name',
        'description',
        'dueEndDate',
        'status',
        'deleted',
        'closed',
        'createdAt',
        'modifiedAt',
        'sprint_id' ] },
  isNewRecord: false }

Answer 1

我从未使用过sequelize，但task中肯定有一些循环引用。

因此，您可以在sequelize查询中使用raw: true选项，或者只使用.toJSON、解构或类似方法发送您想要的属性。

你提到你有一个对象的“解析”版本，发送它而不是sequelize对象。

除了使用raw之外，还应该使用以下方法：

req.io.emit('update', task.toJSON()); // will only have table attributes

req.io.emit('update', JSON.stringify(task)); // you'll get it as string in FE