Add other function to base repository.

mongo.js

@@ -6,7 +6,7 @@ const mongoConfig = {
     username: 'express-user',
     password: 'P@ssword1',
     database: 'express-test'
-}
+};
 
 class Mongo {
     constructor() {
@@ -20,7 +20,15 @@ class Mongo {
             });
 
             client.close();
-        })
+        });
+    }
+
+    find(collectionName, query, callback) {
+        this.db.collection(collectionName).find(query, (error, result) => {
+            assert.equal(null, error, `Unable to find ${collectionName} entities: ${error}.`);
+            console.log(`Entities ${collectionName} founded.`);
+            callback(result);
+        });
     }
 
     insert(collectionName, entity, callback) {
@@ -28,7 +36,7 @@ class Mongo {
             assert.equal(null, error, `Unable to insert ${collectionName} entity: ${error}.`);
             console.log(`Entity ${collectionName} inserted.`);
             callback(result);
-        })
+        });
     }
 
     update(collectionName, entity, query, callback) {
@@ -36,7 +44,15 @@ class Mongo {
             assert.equal(null, error, `Unable to update ${collectionName} entity: ${error}.`);
             console.log(`Entity ${collectionName} updated.`);
             callback(result);
-        })
+        });
+    }
+
+    delete(collectionName, entityId, callback) {
+        this.db.collection(collectionName).deleteOne({id: entityId}, (error, result) => {
+            assert.equal(null, error, `Unable to delete ${collectionName} entity with id ${entityId}: ${error}.`);
+            console.log(`Entity ${collectionName} with id ${entityId} deleted.`);
+            callback(result);
+        });
     }
 }