php - Doctrine order by causing Uncaught exception -

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the following code causing uncaught exception:

class visual

echo(produtocontroller::listaprodutovitrinefiltroordenadopelomenor("tv", "nome", "precodevenda", "asc"));

class controller

$produtos = daogenerico::findbystringorderby("produto", $tipopesquisa, $nome, $parametro, $ordem);

dao

public static function findbystringorderby($classname, $field, $string, $order, $orderparam){     $bd = new bd();     $bd->conectar();     $result = $bd->getentitymanager()->getrepository($classname)->createquerybuilder('e')     ->where('e.'.$field.' :'.$field)     ->setparameter($field, '%'.$string.'%')     ->orderby($order, $orderparam)     ->getquery()     ->getresult();     return $result; }

error:

fatal error: uncaught exception 'doctrine\orm\query\queryexception' message 'select e produto e e.nome :nome order precodevenda asc' in c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query\queryexception.php:41 stack trace: #0 c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query\parser.php(483): doctrine\orm\query\queryexception::dqlerror('select e p...') #1 c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query\parser.php(708): doctrine\orm\query\parser->semanticalerror(''precodevenda' ...', array) #2 c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query\parser.php(283): doctrine\orm\query\parser->processdeferredresultvariables() #3 c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query\parser.php(351): doctrine\orm\query\parser->getast() #4 c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query.php(281): doctrine\orm\query\parser->parse() #5 c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctri in c:\xampp\htdocs\trabalhoa2\vendor\doctrine\orm\lib\doctrine\orm\query\queryexception.php on line 63

somebody can help?

seems entity alias 'e' missing in front of order column 'precodevenda'. try replacing:

->orderby($order, $orderparam)

with 

->orderby('e.'.$order, $orderparam)

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