我们可以使用带有 graphql 的 Multer 上传文件吗？答案

【问题标题】：can we use Multer with graphql to upload files?我们可以使用带有 graphql 的 Multer 上传文件吗？
【发布时间】：2023-02-15 17:08:56
【问题描述】：

我正在寻找一些资源来通过 graphql mongodb 和 Multer 实现文件上传，但我只看到教程和与 rest-api 和 multer 相关的东西所以如果你能在这种情况下提供帮助请告诉我你的意见

【问题讨论】：

标签： api graphql multer

【解决方案1】：

image.Resolver.js ->
const { createWriteStream } = require("fs");
const { join } = require("path");
const { graphqlUploadExpress } = require("graphql-upload");

const storeUpload = async ({ stream, filename }) => {
  const uploadDir = "./uploads";
  const path = join(uploadDir, filename);
  return new Promise((resolve, reject) =>
    stream
      .pipe(createWriteStream(path))
      .on("finish", () => resolve({ path }))
      .on("error", reject)
  );
};

const processUpload = async (upload) => {
  const { createReadStream, filename, mimetype } = await upload;
  const stream = createReadStream();
  const { path } = await storeUpload({ stream, filename });
  return { filename, mimetype, path };
};

module.exports = {
  upload: graphqlUploadExpress().single("file"),
  Mutation: {
    uploadFile: async (_, { file }) => {
      const result = await processUpload(file);
      const newFile = await File.create(result);
      return newFile;
    },
  },
};

image.Schema.js ->
module.exports = `
type File {
    id: ID!
    filename: String!
    mimetype: String!
    path: String!
  }
  scalar Upload 
   
  type Mutation {
    uploadFile(file: Upload!): File!
  }`;

File.js ->
'use strict';
module.exports = mongoose => {
  const newSchema = new mongoose.Schema({
    filename: {
      type: String
    },
    mimetype: {
      type: String
    },
    path: {
      type: String
    }
  }, {
    timestamps: {
      createdAt: 'created_at',
      updatedAt: 'updated_at'
    }
  });
  const image = mongoose.model('image', newSchema);
  return image;
};

【讨论】：