Полный отказ от $u->testAction() целиком.

_incl_data/class/Helper/QueryBuilder.php

@@ -19,14 +19,14 @@ class QueryBuilder
     public function select(array $filters = [], int $limit = 0): array
     {
         if (empty($filters)) {
-            return ['sql' => "select {$this->columns} from {$this->tableName}"];
+            return ['sql' => "select $this->columns from $this->tableName"];
         }
         $where = [];
         $params = [];
         foreach ($filters as $filter) {
             [$name, $operation, $value] = explode(' ', $filter, 3);
             $placeholder = ":$name";
-            $value = explode(' ', $value, 3);
+            $value = explode(' ', $value, 3); //todo: а ведь может прилететь значение из нескольких слов с пробелом...
             if (count($value) === 1) {
                 $value = $value[0];
                 if (is_numeric($value)) {