User model/migrations and gorm init

pkg/util/common.go

@@ -0,0 +1,18 @@
+package util
+
+import (
+	"math/rand"
+	"time"
+)
+
+// RandStringRunes 返回随机字符串
+func RandStringRunes(n int) string {
+	var letterRunes = []rune("1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+	rand.Seed(time.Now().UnixNano())
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letterRunes[rand.Intn(len(letterRunes))]
+	}
+	return string(b)
+}