//listParse takes a collection and some query values and generates an iterator
//for the objects that should be returned on that page
func listParse(c *mgo.Collection, v url.Values) (*mgo.Iter, int, int) {
//parse out sorting
sort := map[string]int{}
for key, _ := range v {
val := v.Get(key)
if len(key) > 5 && strings.HasPrefix(key, "sort_") {
field := key[5:]
switch strings.ToLower(val) {
case "asc":
sort[field] = 1
case "desc":
sort[field] = -1
}
}
}
//set up the query with the correct sort order
query := c.Find(nil).Sort(sort)
//pagination
page, numpage := grabInt(v, "page", 0), grabInt(v, "numpage", 20)
if page < 1 {
page = 1
}
if numpage < 1 {
numpage = 1
}
//pages are 1 indexed.
query = query.Skip(numpage * (page - 1)).Limit(numpage)
return query.Iter(), page, numpage
}
