eZ\Publish\Core\FieldType\Author\SearchField::getDefaultSortField PHP Method

getDefaultSortField() public method

As field types can index multiple fields (see MapLocation field type's implementation of this interface), this method is used to define default field for sorting. Default field is typically used by Field sort clause.
public getDefaultSortField ( ) : string
return string
    public function getDefaultSortField()
    {
        return 'sort_value';
    }