func (ps postSlice) orderedBy(key string, desc bool) {
var ms multiSorter
byPoints := func(p1, p2 *Post) bool {
return p1.Points < p2.Points
}
byPosted := func(p1, p2 *Post) bool {
return p2.PostAt.After(p1.PostAt)
}
switch key {
case "points":
ms = multiSorter{less: []lessFunc{byPoints}}
case "post_at":
ms = multiSorter{less: []lessFunc{byPosted}}
default:
glog.Warn("orderedBy: posts sort by key %s not implement yet.\n", key)
return
}
ms.posts = ps
if desc {
sort.Sort(sort.Reverse(&ms))
} else {
sort.Sort(&ms)
}
}
// taxonomy
func getTopicsByTaxonomy(tax string, start, count int) (posts []*Post, err error) {
term, err := getTaxByName(tax, "category")
if err != nil {
if err == gorm.RecordNotFound {
err = nil
}
return
}
// 写不出join语句，先一个个查吧...
ids, err := getObjectsByTerm(term, start, count)
if err != nil {
if err == gorm.RecordNotFound {
err = nil
}
return
}
for _, id := range ids {
if post, err := getPostById(id.ObjectId, false); err == nil {
posts = append(posts, post)
} else {
glog.Warn("getTopicsByTaxonomy: Not found post by id: %s tax: %s\n", id.ObjectId, tax)
}
}
postSlice(posts).orderedBy("points", true)
return
}
// 查找一个主题的回复
func getReplyByPid(pid string, start, count int, options ...interface{}) (posts []*Post, err error) {
q := db.Where("sub_type=?", "reply").
Where("post_parent=?", pid)
if len(options) > 0 {
opt := options[0].(map[string]interface{})
for key, val := range opt {
switch key {
case "points":
sval := strings.ToLower(val.(string))
if sval != "desc" && sval != "asc" {
glog.Warn("option for points invalid: %s, should be asc or desc.\n", sval)
sval = "desc"
}
q = q.Order("points " + sval)
}
}
} else {
q = q.Order("floor asc")
}
err = q.Offset(start).
Limit(count).
Find(&posts).Error
if err != nil && err != gorm.RecordNotFound {
return
}
return
}
// 更加不同的角度，查找posts
// point: default, digest, rocket, latest, controversy
func getPostsByPoint(point string, start, count int) (posts []*Post, ret int, err error) {
q := db.Where("object_type=?", "post")
switch point {
case "default":
q.Order("points desc")
case "digest":
q.Where("digest=1").Order("publish_at desc")
case "latest":
q.Order("post_at desc")
case "rocket":
// Todo
case "controversy":
// Todo
default:
glog.Warn("getPostsByPoint: unknown piont: %s\n", point)
}
err = q.Offset(start).Limit(count).Find(&posts).Error
if err != gorm.RecordNotFound {
err = nil
}
return
}