Implemented api validation and item route patch

- Implemented api field validation in item api routes
- Implemented PATCH api route for item endpoint

src/assets/helper.ts

@@ -70,9 +70,21 @@ export function parseIntRelation(data: string, relation_name: string = 'id') {
 	// This function is perfect. If data is not a valid number, return `undefined`
 	// If it is a valid number return `{connect: {relation_name: yourNumber}}}`
 	// This can be used by prisma to connect relations
+
+	// If the incoming data is null or empty, return a prisma disconnect object instead of a connect one
+	if (data === null || data === '') {
+		return JSON.parse(`{
+			"disconnect": true
+		}`);
+	}
+
 	return isNaN(parseInt(data)) ? undefined : JSON.parse(`{
 		"connect": {
 			"${relation_name}": ${parseInt(data)}
 		}
 	}`);
 }
+
+export function parseIntOrUndefined(data: string) {
+	return isNaN(parseInt(data)) ? undefined : parseInt(data);
+}