Added some error handling to categories api

- AFLOW-13
- Added check if an category entry already exists.
- Update prechek if all IDs are existing

src/routes/api/v1/categories.ts

@@ -48,20 +48,43 @@ function post(req: Request, res: Response) {
 			res.status(201).json({ status: 'created' });
 		})
 		.catch((err) => {
-			// TODO Catch if is a duplicate error and show a message to the user
+			// Check if an entry already exists.
-			log.db.error(err);
+			if (err.code === 'P2002') {
-			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				// P2002 -> "Unique constraint failed on the {constraint}"
+				// https://www.prisma.io/docs/reference/api-reference/error-reference
+				res.status(409).json({ error: 'Category already exists.' });
+			} else {
+				log.db.error(err);
+				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+			}
 		});
 }
 
 // Update category.
-function patch(req: Request, res: Response) {
+async function patch(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id || !req.body.name) {
 		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
 		return;
 	}
 
+	// Check if the category id exists. If not return 410 Gone.
+	try {
+		const result = await prisma.itemCategory.findUnique({
+			where: {
+				id: parseInt(req.body.id)
+			}
+		});
+
+		if (result === null) {
+			res.status(410).json({ error: 'category does not exist.' });
+			return;
+		}
+	} catch (err) {
+		log.db.error(err);
+		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+	}
+
 	prisma.itemCategory
 		.update({
 			where: {
@@ -76,9 +99,15 @@ function patch(req: Request, res: Response) {
 			res.status(201).json({ status: 'updated' });
 		})
 		.catch((err) => {
-			// TODO Catch if is a duplicate error and show a message to the user
+			// Check if an entry already exists.
-			log.db.error(err);
+			if (err.code === 'P2002') {
-			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				// P2002 -> "Unique constraint failed on the {constraint}"
+				// https://www.prisma.io/docs/reference/api-reference/error-reference
+				res.status(409).json({ error: 'Category already exists.' });
+			} else {
+				log.db.error(err);
+				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+			}
 		});
 }
 
@@ -114,7 +143,7 @@ async function del(req: Request, res: Response) {
 			}
 		})
 		.then(() => {
-			res.status(201).json({ status: 'deleted' });
+			res.status(200).json({ status: 'deleted' });
 		})
 		.catch((err) => {
 			log.db.error(err);