问题描述
我想使用graphql解析器将文件上传到mongodb。 在server.js中,我具有此帮助功能来存储文件,该文件被导出以在解析器中使用。 该函数基于我在这里找到的内容:https://github.com/jaydenseric/graphql-upload/issues/8),但是现在graphql中的某些事情已经改变。例如,解构文件对象。我不知道应该在路径变量中找到什么,以及如何使用此createReadStream(已从文件中解构的函数)。
const mongoose = require('mongoose');
const Grid = require('gridfs-stream');
const fs = require('fs');
//...
// Connect to Mongo
mongoose
.connect(process.env.mongoURI,{
useNewUrlParser: true,useCreateIndex: true,useUnifiedTopology: true,useFindAndModify: false
}) // Adding new mongo url parser
.then(() => console.log('MongoDB Connected...'))
.catch(err => console.log(err));
const storeFile = async (upload) => {
const { filename,createReadStream,mimetype } = await upload.then(result => result);
const bucket = new mongoose.mongo.GridFSBucket(mongoose.connection.db,{ bucketName: 'files' });
const uploadStream = bucket.openUploadStream(filename,{
contentType: mimetype
});
createReadStream()
.pipe(uploadStream)
.on('error',console.log('error'))
.on('finish',console.log('finish'));
}
module.exports = { storeFile }
//...
我的解析器(这里是最低版本,因为现在我只想将文件上传到数据库中。在我的一次尝试中,它甚至创建了fs.files和fs.chunks集合,但没有数据):
Mutation: {
uploadFile: async (_,{ file }) => {
console.log(file);
const fileId = await storeFile(file);
return true;
}
}
我现在遇到此错误:
在终端中,我已经打印了“错误”(例如在pipe.on('error',console.log('error')语句)
我只能上传小文件(最大60 kb),所有大文件只是不上传,但是所有尝试都显示错误。
解决方法
好,我设法解决了。
解析器突变:
const { storeFile } = require('../../server');
//...
uploadFile: async (_,{ file }) => {
const fileId = await storeFile(file).then(result => result);
return true;
// later I will return something more and create some object etc.
}
server.js的支持功能
const storeFile = async (upload) => {
const { filename,createReadStream,mimetype } = await upload.then(result => result);
const bucket = new mongoose.mongo.GridFSBucket(mongoose.connection.db,{ bucketName: 'files' });
const uploadStream = bucket.openUploadStream(filename,{
contentType: mimetype
});
return new Promise((resolve,reject) => {
createReadStream()
.pipe(uploadStream)
.on('error',reject)
.on('finish',() => {
resolve(uploadStream.id)
})
})
}
module.exports = { storeFile }