如何使用Uppy的Dashboard插件传递元数据

Question

当涉及到使用Uppy时，我是一个初学者。我相信像你这样的专业人士可以解决这个问题。但是我在向我的上传路线发送特定的元数据信息时遇到了问题。

uppy.js

// Import the plugins
const Uppy = require('@uppy/core');
const XHRUpload = require('@uppy/xhr-upload');
const Dashboard = require('@uppy/dashboard');

const request = require('request');

const uppy = Uppy({
    debug: true,
    autoProceed: false,
    restrictions: {
        maxFileSize: 1024000,
        maxNumberOfFiles: 3,
        minNumberOfFiles: 1,
        allowedFileTypes: ['image/*', 'video/*']
    }
})
    .use(Dashboard, {
        trigger: '.UppyModalOpenerBtn',
        inline: true,
        target: '#drag-drop-area',
        replaceTargetContent: true,
        showProgressDetails: true,
        proudlyDisplayPoweredByUppy: false,
        animateOpenClose: true,
        note: 'Images and video only, 1–3 files, up to 1 MB',
        height: 470,
        browserBackButtonClose: true,
        theme: 'dark',
        metaFields: [
            {id: 'caption', name: 'Caption', placeholder: 'describe what the image is about'}
        ]
    });

uppy.on('file-added', (file) =>{
    console.log(file);
    uppy.setFileMeta(file.meta.id, {
       caption: file.name
    });


});


uppy.use(XHRUpload, {
    id: 'XHRUpload',
    endpoint: 'http://localhost:8000/upload',
    method: 'POST',
    formData: true,
    fieldName: 'my_file',
    metaFields: ['caption'],
    bundle: true

});


uppy.on('upload-success', (file, response) => {
    //console.log(file.meta.caption);
    console.log("File uploaded successfully ", file);
});

module.exports = uppy;

upload.js

router.post('/',(req, res, next) => {

  console.log("Coming form uppy.js " , req.body);

});

module.exports = router;

我在将'caption‘值传递给我的路线时遇到问题。当我查看Google Chrome开发者工具的“网络标签”时，它给我一条“未定义”的信息。如果你能给我指出正确的方向，我将不胜感激！谢谢!

Answer 1

首先，需要将file.meta.id更改为file.id

uppy.on('file-added', (file) =>{
    console.log(file);
    uppy.setFileMeta(file.id, {
        test: 'hello'
    });
});

但是如果你使用bundle，你应该知道这个注释

Note: When bundle is set to true, only global uppy metadata, the one set via meta options property, is sent to the endpoint. Individual per-file metadata is ignored.

因此，如果您希望为每个文件发送元数据，则应将其更改为false，然后您将面临针对每个文件单独请求，但所有元数据都将出现在请求中