Implement question order generator

orm/contest.go

@@ -3,6 +3,9 @@ package orm
 import (
 	"fmt"
 	"log"
+	"math/rand"
+	"strconv"
+	"strings"
 
 	"net/http"
 	"time"
@@ -173,3 +176,23 @@ func SaveContest(contest interface{}) (interface{}, error) {
 	}
 	return contest, nil
 }
+
+func (c *Contest) generateQuestionsOrder() string {
+	var order []string
+
+	count := 0
+	generated := make(map[int]bool, 0)
+
+	for count == len(c.Questions) {
+		number := rand.Intn(len(c.Questions) + 1)
+		if generated[number] {
+			continue
+		}
+		generated[number] = true
+		order = append(order, strconv.Itoa(number))
+		count++
+	}
+
+	log.Println(strings.Join(order, " "))
+	return strings.Join(order, " ")
+}

orm/participant.go

@@ -111,6 +111,11 @@ func (model *Participant) AfterSave(tx *gorm.DB) error {
 			}).Error; err != nil {
 			return err
 		}
+
+		if err := tx.Model(&response).Update("QuestionsOrder", contest.generateQuestionsOrder()).Error; err != nil {
+			return err
+		}
+
 	}
 	return nil
 }