func collectionAndSubDocumentSelectors(query Query) (collection *Collection, selectors []string) {
selectors = []string{}
for collection == nil {
collection, _ = query.(*Collection)
selector := query.subDocumentSelector()
if selector != "" {
selectors = append(selectors, selector)
}
query = query.ParentQuery()
}
utils.ReverseStringSlice(selectors)
return collection, selectors
}
func (self *sortQuery) mongoQuery() (q *mgo.Query, err error) {
elems := []string{self.selector}
for query := self.parentQuery; query != nil; query = query.ParentQuery() {
s, ok := query.(*sortQuery)
if !ok {
break
}
elems = append(elems, s.selector)
}
utils.ReverseStringSlice(elems)
q, err = self.parentQuery.mongoQuery()
if err != nil {
return nil, err
}
return q.Sort(elems...), nil
}