Essential backend functionality, including logins.

api/controllers/borrowController.js

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+'use strict';
+
+const mongoose = require('mongoose');
+const User = mongoose.model('User'),
+  Book = mongoose.model('Book');
+
+exports.list_all = function(req, res) {
+  res.json(req.user.borrowing);
+};
+
+exports.update = function(req, res) {
+  Book.findOne({
+    _id: req.body.bookId
+  }).then((book) => {
+    if (!book) {
+      res.status(400).send("Book not found.");
+    } else {
+      // TODO check that the book isn't already borrowed
+      req.user.borrowing.push({
+        bookId: book._id,
+        date: Date.now()
+      });
+      User.findOneAndUpdate({
+        _id: req.user._id
+      }, req.user, {
+        useFindAndModify: false
+      }).exec();
+      book.amount_loaned += 1;
+      Book.findOneAndUpdate({
+        _id: book._id
+      }, book, {
+        useFindAndModify: false
+      }).exec();
+      res.json(req.user.borrowing);
+    }
+  });
+};
+
+// TODO
+exports.delete = function(req, res) {
+  Book.findOne({
+    _id: req.body.bookId
+  }).then((book) => {
+    if (!book) {
+      res.status(400).send("Book not found.");
+    } else {
+      let isBookLoaned = false;
+      for (let i = 0; i < req.user.borrowing.length; i++) {
+        const b = req.user.borrowing[i];
+        console.log(`${typeof b.bookId}, ${typeof book.id}`);
+        if (b.bookId.toString() === book.id) {
+          console.log(`${b.bookId}, ${book._id}`);
+          req.user.borrowing.splice(i, 1);
+          isBookLoaned = true;
+        }
+      }
+      if (isBookLoaned) {
+        User.findOneAndUpdate({
+          _id: req.user._id
+        }, req.user, {
+          useFindAndModify: false
+        }).exec();
+        book.amount_loaned -= 1;
+        Book.findOneAndUpdate({
+          _id: book._id
+        }, book, {
+          useFindAndModify: false
+        }).exec();
+        res.json(req.user.borrowing);
+      } else {
+        res.status(400).send("You haven't loaned this book.")
+      }
+    }
+  });
+};