delta-file-multer/index.js

A simple plug-n-play file upload middleware using Multer and MongoDB

import { setupUploader } from "./uploader.js";

const deltaMulter = ({
  app,
  dbField,
  collectionName,
  uploadPath,
  route,
  mongoose,
}) => {
  if (!app || !dbField || !collectionName || !uploadPath || !route) {
    throw new Error("Missing required options in delta-file-multer config.");
  }

  const upload = setupUploader({ uploadPath });

  // Dynamically create schema & model
  const dynamicSchema = new mongoose.Schema({
    [dbField]: { type: String, required: true },
  });

  const model =
    mongoose.models[collectionName] ||
    mongoose.model(collectionName, dynamicSchema);

  // Route
  app.post(route, upload.single("file"), async (req, res) => {
    if (!req.file) {
      return res
        .status(400)
        .json({ success: false, message: "File is required" });
    }

    const newDoc = new model({ [dbField]: req.file.filename });

    try {
      await newDoc.save();
      res.json({
        success: true,
        message: "File uploaded successfully",
        file: req.file.filename,
      });
    } catch (err) {
      console.error(err);
      res.status(500).json({ success: false, message: "Upload failed" });
    }
  });
};

export default deltaMulter;