Merge branch 'main' of https://github.com/AlexanderDmitriev/FinalProjectReact-Node-Back

Author: AlexanderDmitriev

FinalProjectReact-Node-Back

@@ -1,15 +1,15 @@
 const {Book} = require("../../models/book");
-
-// const add = async (req, res) => {
-// const result = await Book.create(req.body);
-// res.status(201).json(result);
-// }
+const { RequestError } = require("../../helpers");
 
 const add = async(req, res) => {
     const {_id: owner} = req.user;
+    const {author, title} = req.body;
+    const book = await Book.findOne({author, title});
+    if (book) {
+        throw RequestError(409, "This book already exsist in your library")
+    }
     const result = await Book.create({...req.body, owner});
     res.status(201).json(result);
 }
 
-
 module.exports = add;