handlerFactory.js

const catchAsync = require("../utils/catchAsync");
const AppError = require("../utils/appError");
const APIFeatures = require("../utils/apiFeatures");

// DELETE
exports.deleteOne = (Model) =>
  catchAsync(async (req, res, next) => {
    const doc = await Model.findByIdAndDelete(req.params.id);
    if (!doc) {
      return next(new AppError("No document found with that ID", 404));
    }
    res.status(204).json({ status: "success", data: null });
  });

// PATCH
exports.updateOne = (Model) =>
  catchAsync(async (req, res, next) => {
    const doc = await Model.findByIdAndUpdate(req.params.id, req.body, {
      new: true, // true = return the new update document , false = return the original document
      runValidators: true,
    });
    if (!doc) {
      return next(new AppError("No document found with that ID", 404));
    }
    res.status(200).json({
      status: "succes",
      data: doc,
    });
  });

exports.createOne = (Model) =>
  catchAsync(async (req, res, next) => {
    const doc = await Model.create(req.body);

    res.status(201).json({
      status: "success",
      data: doc,
    });
  });

exports.getOne = (Model, popOptions) =>
  catchAsync(async (req, res, next) => {
    let query = Model.findById(req.params.id);
    if (popOptions) query = query.populate(popOptions);
    const doc = await query;
    if (!doc) {
      return next(new AppError("No document found with that ID", 404));
    }
    res.status(200).json({ status: "success", data: { doc } });
  });

// GET ALL
exports.getAll = (Model) =>
  catchAsync(async (req, res, next) => {
    // EXECUTE QUERY
    const features = new APIFeatures(Model.find(), req.query)
      .filter()
      .sort()
      .limitFields()
      .paginate();
    const doc = await features.query;

    //SEND RESPONSE
    res.status(200).json({
      status: "succes",
      results: doc.length,
      data: { data: doc },
      requestedAt: req.requestTime,
    });
  });