Cannot update with same value

Core/Model.php

@@ -144,6 +144,19 @@ abstract class Model
             try {
                 $db = static::connectDB();
 
+                $result = $this->showAll();
+
+                foreach ($result as $post) {
+                    foreach ($post as $key => $val) {
+                        if (isset($args[$key])) {
+                            if ($args[$key] == $post[$key]) {
+                                return false;
+                            }
+                        }
+                    }
+                }
+
+
                 $sql = "UPDATE {$table} SET {$fields} WHERE id = ?";
 
                 $query = $db->prepare($sql);