PLT-7822: Fix search order for SQL search backend. (#7704)

model/post_list.go

@@ -6,6 +6,7 @@ package model
 import (
 	"encoding/json"
 	"io"
+	"sort"
 )
 
 type PostList struct {
@@ -82,6 +83,12 @@ func (o *PostList) Extend(other *PostList) {
 	}
 }
 
+func (o *PostList) SortByCreateAt() {
+	sort.Slice(o.Order, func(i, j int) bool {
+		return o.Posts[o.Order[i]].CreateAt > o.Posts[o.Order[j]].CreateAt
+	})
+}
+
 func (o *PostList) Etag() string {
 
 	id := "0"