protected function assignFields($fields)
    {
        foreach ($fields as $field) {
            if (!$field instanceof FieldInterface) {
                throw new ModelException(sprintf('Field must be an instance of FieldInterface, got "%s"', $this->getType($field)));
            }

            $field->table($this->table);
            $this->fields[$field->name()] = $field;
        }
    }