finish taller4

taller4/controllers/bookController.js

@@ -0,0 +1,83 @@
+
+var Book = require('../models/book.js');
+
+function list_books(req, res) {
+    Book.find({}, (err, book) => {
+        if (err) {
+            return res.status(500).send({ message: 'Error: Could not get books!' });
+        }
+        res.status(200).send({ book });
+    })
+}
+
+function show_book(req, res) {
+    let id = { '_id': req.params.id };
+    Book.find(id, (err, book) => {
+        if (err) {
+            return res.status(500).send({ message: 'Error: Could not get books!' });
+        }
+        res.status(200).send({ book });
+    })
+}
+
+function new_book(req, res) {
+    try{
+        let book = new Book();
+        book.nombre = req.body.nombre;
+        book.anio = req.body.anio;
+        book.idioma = req.body.idioma;
+        book.autor = req.body.autor;
+        book.save((err, bookSave) => {
+            if (err) {
+                return res.status(400).send({ message: `Error: Could not save book to database!> ${err}` });
+            }
+            res.status(200).send({ book: bookSave });
+        })
+    } 
+    catch (error) {
+        res.status(500).send({ message: `error:` + error });
+    }
+}
+
+function modify_book(req, res) {
+    let book = new Book();
+    book._id = req.params.id;
+    book.nombre = req.body.nombre;
+    book.anio = req.body.anio;
+    book.idioma = req.body.idioma;
+    book.autor = req.body.autor;
+    Book.updateOne({ '_id': book._id }, book, (err, updatedBook) => {
+        if (err) {
+            return res.status(400).send({ message: `Error: Could not save book to database!> ${err}` });
+        }
+        if (updatedBook.nModified == 1) {
+            res.status(200).send({ message: `Book modified!` });
+        }
+        else {
+            res.status(400).send({ message: `Error: Book could not be modified!` });
+        }
+    });
+}
+
+function delete_book(req, res) {
+    let id = { '_id': req.params.id };
+    Book.deleteOne(id, (err, book) => {
+        if (err) {
+            return res.status(400).send({ message: `Error: Could not save book to database!> ${err}` });
+        }
+        if (book.deletedCount == 1) {
+            res.status(200).send({ message: `Book deleted!` });
+        }
+        else {
+            res.status(400).send({ message: `Error: Book could not be deleted!` });
+        }
+    });
+}
+
+module.exports = {
+    list_books,
+    show_book,
+    new_book,
+    modify_book,
+    delete_book
+};