clears all defined settings

  $coll->clear();

check if options for named field exist in collection and return related hash. Returns false if named field not found in collection.

  $index = $coll->index("some_field");

adds new sorting rule to collection

  $coll->add("some_field","ASC");

array of all already defined sorting rules. Each element has two properties

• name - name of related field
• direction - direction of sorting

  $name = $coll->rules[0]["name"]
  $coll->rules[0]["direction"]="DESC";