a lot of fixes, implementing abstract product api endpoints

src/services/abstractproduct.js

@@ -0,0 +1,10 @@
+import db from '../db.js';
+
+class AbstractProductService {
+    async create (groupid, barcode, name, net_weight, image_filename, category, unit) {
+        await db.query("INSERT INTO abstract_products (group_id, barcode, name, net_weight, image_filename, category, unit) VALUES ($1, $2, $3, $4, $5, $6, $7)", [groupid, barcode, name, net_weight, image_filename, category, unit]);
+        
+    }
+};
+
+export default new AbstractProductService();

src/services/group.js

@@ -29,6 +29,10 @@ class GroupService {
     async getPassword(id) {
         return (await db.query("SELECT password FROM groups WHERE id = $1", [id])).rows[0].password;
     }
+
+    async getByName(name) {
+        return (await db.query("SELECT * FROM groups WHERE name = $1", [name])).rows[0]
+    }
 };
 
 export default new GroupService();