如何解决如何使用异步函数更新后端数据？
我正在使用音频编码桌面应用程序，其中前端将向我发送名为 jobdata 的数据库数据，我必须更新 jobdata 数组中存在的 jobdetails 对象，如下所示
"jobId": "dc67b147-754f-48e3-8233-da4aa66913d6","currentLicenseCount": 1,"licenseId": "159bb263-b265-451a-ae3d-0d789d586de7","completedAt": 0,"reservedLicenseCount": 3,"isComplete": false,"userId": "5728f50d-146b-47d2-aa7b-a50bc37d641d","updatedAt": 1616999479,"jobDetails": [
{
"encodingStrength": 0,"contentValidation": true,"contentFilePath": "/home/ubuntu/Downloads/sample1 (2).mp3","additionalMetadata": {
"format": {
"container": "MPEG","duration": 122.12244897959184,"codec": "MPEG 1 Layer 3","trackInfo": [],"codecProfile": "CBR","numberOfChannels": 2,"bitrate": 128000,"lossless": false,"sampleRate": 44100,"tagTypes": [
"ID3v2.4"
]
},"contentSamplingFrequency": 128000,"contentFileType": null,"contentDescription": null,"sonicKey": "fooyGoXpdAf","contentDuration": 122.12244897959184,"contentSize": 0,"liscenseId": "159bb263-b265-451a-ae3d-0d789d586de7","contentEncoding": null,"contentFileName": "sample1 (2).mp3","contentQuality": null,"contentType": "MPEG","fileId": "f6722638-629a-4b88-a3cc-ac5334f762d5"
},{
"encodingStrength": 0,"contentFilePath": "/home/ubuntu/Downloads/sample1.mp3","sonicKey": "8iYrr1p0O3X","contentFileName": "sample1.mp3","fileId": "05d1be20-f816-438b-8063-da25305459e7"
},"contentFilePath": "/home/ubuntu/Downloads/sample3.mp3","duration": 105.82204081632653,"sonicKey": "uwE4yCM_2YO","contentDuration": 105.82204081632653,"contentFileName": "sample3.mp3","isComplete": true,"fileId": "15e063ed-8e12-44cd-8674-011e2a189e26"
}
],"createdAt": 1616999479,"jobName": "meet job 1"
}
这里是一个对象数组，如果作业有 3 个文件并且我必须将“iscomplete”标志更新为 true 并且我不能直接将元素设为 true 因为可能有多个文件 ID 的 ...所以我只需要迭代直到数组的长度并在我的后端更新“iscomplete”，我在前端发现“iscomplete”标志为真，我使用了 foreach 循环，但我不知道为什么这部分没有没有更新....
//mark file completion and increment the current license count of the job
var arrayFileData = [];
arrayFileData = jobData.jobDetails;
arrayFileData.forEach(function (_value,i) {
if ((fileId == arrayFileData[i]['fileId'])) {
arrayFileData[i]['isComplete'] = true;
jobData['currentLicenseCount'] = jobData['currentLicenseCount'] + 1;
jobData.jobDetails = arrayFileData;
}
});
可以使用 async/await 或 promise 来完成吗？
解决方法
在你的 forEach 函数中，你没有很好地解构它（你错过了 additonalMetadata）这就是为什么它没有得到更新，正确的函数将是这样的
if ((fileId == arrayFileData[i]['additionalMetadata']['fileId'])) {
arrayFileData[i]['additionalMetadata']['isComplete'] = true;
jobData['currentLicenseCount'] = jobData['currentLicenseCount'] + 1;
jobData.jobDetails = arrayFileData;
}
});
或者您可以使用更简化的功能，例如
let arrayFileData = []
const fileId = '05d1be20-f816-438b-8063-da25305459e7'
arrayFileData = jobData.jobDetails
arrayFileData.forEach((item,index) => {
if (fileId === item.additionalMetadata.fileId) {
item.additionalMetadata.isComplete = true
jobData.currentLicenseCount = jobData.currentLicenseCount + 1
}
})
我们只能在异步函数中使用 async/await 或 promise，这是一个同步函数，所以不能在其中使用 async/await 或 promise。
我也附上了示例代码并更新了其中一个fileId，你也可以看看。
const jobData = {
jobId: 'dc67b147-754f-48e3-8233-da4aa66913d6',currentLicenseCount: 1,licenseId: '159bb263-b265-451a-ae3d-0d789d586de7',completedAt: 0,reservedLicenseCount: 3,isComplete: false,userId: '5728f50d-146b-47d2-aa7b-a50bc37d641d',updatedAt: 1616999479,jobDetails: [
{
encodingStrength: 0,contentValidation: true,contentFilePath: '/home/ubuntu/Downloads/sample1 (2).mp3',additionalMetadata: {
format: {
container: 'MPEG',duration: 122.12244897959184,codec: 'MPEG 1 Layer 3',trackInfo: [],codecProfile: 'CBR',numberOfChannels: 2,bitrate: 128000,lossless: false,sampleRate: 44100,tagTypes: ['ID3v2.4'],},contentSamplingFrequency: 128000,contentFileType: null,contentDescription: null,sonicKey: 'fooyGoXpdAf',contentDuration: 122.12244897959184,contentSize: 0,liscenseId: '159bb263-b265-451a-ae3d-0d789d586de7',contentEncoding: null,contentFileName: 'sample1 (2).mp3',contentQuality: null,contentType: 'MPEG',fileId: 'f6722638-629a-4b88-a3cc-ac5334f762d5',{
encodingStrength: 0,contentFilePath: '/home/ubuntu/Downloads/sample1.mp3',sonicKey: '8iYrr1p0O3X',contentFileName: 'sample1.mp3',fileId: '05d1be20-f816-438b-8063-da25305459e7',contentFilePath: '/home/ubuntu/Downloads/sample3.mp3',duration: 105.82204081632653,sonicKey: 'uwE4yCM_2YO',contentDuration: 105.82204081632653,contentFileName: 'sample3.mp3',isComplete: true,fileId: '15e063ed-8e12-44cd-8674-011e2a189e26',],createdAt: 1616999479,jobName: 'meet job 1',}
//mark file completion and increment the current license count of the job
let arrayFileData = []
const fileId = '05d1be20-f816-438b-8063-da25305459e7'
//Added a constant ID,can assume it as a frontend request
arrayFileData = jobData.jobDetails
arrayFileData.forEach((item,index) => {
if (fileId === item.additionalMetadata.fileId) {
item.additionalMetadata.isComplete = true
jobData.currentLicenseCount = jobData.currentLicenseCount + 1
}
})
console.log('Job Data :',jobData)版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。
