Correct the insert function in base repository.

src/js/mongoClient.js

@@ -14,12 +14,6 @@ class MongoClient {
             assert.equal(null, err);
             console.log('Connected successfuly to mongodb');
             this.db = client.db(mongoConfig.database);
-
-            this.db.collection('test').find({}, (err, results) => {
-                results.forEach(console.log);
-            });
-
-            // client.close();
         });
     }
 
@@ -37,7 +31,8 @@ class MongoClient {
         this.db.collection(collectionName).insert(entity, (error, result) => {
             assert.equal(null, error, `Unable to insert ${collectionName} entity: ${error}.`);
             console.log(`Entity ${collectionName} inserted.`);
-            callback(result);
+            // Return only the inserted document.
+            callback(result.ops[0]);
         });
     }