add video command body

model/lottery.go

@@ -2,7 +2,6 @@ package model
 
 import (
 	"database/sql"
-	"math/rand"
 	"time"
 )
 
@@ -29,8 +28,7 @@ func GetRandomLotteryByType(t string) (p *Lottery, err error) {
 
 // GetRandomLotteryByTypeAndLimit -
 func GetRandomLotteryByTypeAndLimit(t string, limit int) (p []*Lottery, err error) {
-	offset := rand.Intn(10)
-	err = x.Select(&p, `select * from "public"."lottery" where "type" = $1 order by random() offset $2 limit $3`, t, offset, limit)
+	err = x.Select(&p, `select * from "public"."lottery" where "type" = $1 offset floor(random() * (select count(*) as c from "public"."lottery" where "type" = $2)) limit $3`, t, t, limit)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	}