function getOrderByFields(QuerySet $queryset)
{
$orders = array();
if (!($columns = $queryset->getSortFields())) {
return $orders;
}
foreach ($columns as $sort) {
$dir = 'ASC';
if (is_array($sort)) {
list($sort, $dir) = $sort;
}
if ($sort instanceof Util\Expression) {
$field = $sort->toSql($this, $model);
} else {
if ($sort[0] == '-') {
$dir = 'DESC';
$sort = substr($sort, 1);
}
// If the field is already an annotation, then don't
// compile the annotation again below. It's included in
// the select clause, which is sufficient
if (isset($this->annotations[$sort])) {
$field = $this->quote($sort);
} else {
list($field) = $this->getField($sort, $model);
}
}
if ($field instanceof Util\Expression) {
$field = $field->toSql($this, $model);
}
// TODO: Throw exception if $field can be indentified as
// invalid
$orders[] = "{$field} {$dir}";
}
return $orders;
}
function union(QuerySet $other, $all = true)
{
// Values and values_list _must_ match for this to work
if ($this->countSelectFields() != $other->countSelectFields()) {
throw new Exception\OrmError('Union queries must have matching values counts');
}
// TODO: Clear OFFSET and LIMIT in the $other query
$this->chain[] = array($other, $all);
return $this;
}
