问题
I am trying to pass a multiple sort query to the "Sort" parameter of the mgo package (see https://godoc.org/labix.org/v2/mgo#Query.Sort).
If the parameters are dynamic (currently held in a slice), how can I translate that into a valid sort string.
A working example would be:
db.C(Collection).Find(Query).Limit(limit).Sort("-created_when", "-title").Iter()
But if "-created_when" and "-title" are held in a slice, and I try using a slice join like:
sortBy := []string{"-created_when", "title"}
db.C(Collection).Find(Query).Limit(limit).Sort(strings.Join(sortBy, ",")).Iter()
The query doesn't work correctly.
How can I translate the arbitrary fields in the slice into the .Sort([string1], [string2], ...) format required??
回答1:
Like this:
db.C(Collection).Find(Query).Limit(limit).Sort(sortBy...).Iter()
来源：https://stackoverflow.com/questions/32908186/golang-bson-sort-parameters-in-mgo