Replace Fawn and use native transaction mongodb

config/custom-environment-variables.json

@@ -1,3 +1,4 @@
 {
-  "jwtPrivateKey": "vidly_jwtPrivateKey"
+  "jwtPrivateKey": "vidly_jwtPrivateKey",
+  "db": "vidly_db"
 }

package.json

@@ -17,7 +17,6 @@
     "cors": "^2.8.5",
     "express": "^4.17.1",
     "express-async-errors": "^3.1.1",
-    "fawn": "^2.1.5",
     "joi": "^17.2.0",
     "joi-objectid": "^3.0.1",
     "jsonwebtoken": "^8.5.1",

routes/rentals.js

@@ -3,12 +3,9 @@ const { Movie } = require("../models/movie");
 const { Customer } = require("../models/customer");
 const auth = require("../middleware/auth");
 const mongoose = require("mongoose");
-const Fawn = require("fawn");
 const express = require("express");
 const router = express.Router();
 
-Fawn.init(mongoose);
-
 router.get("/", auth, async (req, res) => {
   const rentals = await Rental.find()
     .select("-__v")
@@ -42,21 +39,29 @@ router.post("/", auth, async (req, res) => {
     }
   });
 
+  const session = await mongoose.startSession();
+
+  session.startTransaction();
+
   try {
-    new Fawn.Task()
-      .save("rentals", rental)
-      .update(
-        "movies",
-        { _id: movie._id },
-        {
-          $inc: { numberInStock: -1 }
-        }
-      )
-      .run();
-
-    res.send(rental);
-  } catch (ex) {
-    res.status(500).send("Something failed.");
+    await rental.save({ session });
+
+    await Movie.update(
+      { _id: rental.movie._id },
+      {
+        $inc: { numberInStock: -1 }
+      },
+      { session }
+    );
+
+    await session.commitTransaction();
+    res.send(rental)
+  } catch (error) {
+    await session.abortTransaction();
+
+    throw new Error(error);
+  } finally {
+    session.endSession();
   }
 });