protected function getParamKeyByExpr(ExprInterface $expr)
    {
        return str_replace('.', '', $expr->getField()) . ucfirst($expr->getExpression()) . uniqid();
    }
protected function getParamKeyByExpr(ExprInterface $expr)
    {
        return str_replace('.', '', $expr->getField()) . ucfirst($expr->getExpression()) . uniqid();
    }
protected function getParamKeyByExpr ( ExprInterface $ expr ) { return str_replace ( '.' , '' , $ expr -> getField ( ) ) . ucfirst ( $ expr -> getExpression ( ) ) . uniqid ( ) ; }
Get the parameter key that is used by doctrine to put the query parameter identifier.

@param  ExprInterface $expr

@return string
Get the parameter key that is used by doctrine to put the query parameter identifier .