Fix get system setting bug when enabled redis cache (#22295)

Fix #22281

In #21621 , `Get[V]` and `Set[V]` has been introduced, so that cache
value will be `*Setting`. For memory cache it's OK. But for redis cache,
it can only store `string` for the current implementation. This PR
revert some of changes of that and just store or return a `string` for
system setting.

2 files changed, 6 insertions, 8 deletions

diff --git a/models/user/avatar.go b/models/user/avatar.go
index ce25139b5f..e6ca49efd0 100644
--- a/models/user/avatar.go
+++ b/models/user/avatar.go
@@ -67,9 +67,7 @@ func (u *User) AvatarLinkWithSize(size int) string {
 	useLocalAvatar := false
 	autoGenerateAvatar := false
 
-	disableGravatarSetting, _ := system_model.GetSetting(system_model.KeyPictureDisableGravatar)
-
-	disableGravatar := disableGravatarSetting.GetValueBool()
+	disableGravatar := system_model.GetSettingBool(system_model.KeyPictureDisableGravatar)
 
 	switch {
 	case u.UseCustomAvatar:
diff --git a/models/user/setting.go b/models/user/setting.go
index a17483f9af..f5cfef5b33 100644
--- a/models/user/setting.go
+++ b/models/user/setting.go
@@ -53,13 +53,13 @@ func genSettingCacheKey(userID int64, key string) string {
 }
 
 // GetSetting returns the setting value via the key
-func GetSetting(uid int64, key string) (*Setting, error) {
-	return cache.Get(genSettingCacheKey(uid, key), func() (*Setting, error) {
+func GetSetting(uid int64, key string) (string, error) {
+	return cache.GetString(genSettingCacheKey(uid, key), func() (string, error) {
 		res, err := GetSettingNoCache(uid, key)
 		if err != nil {
-			return nil, err
+			return "", err
 		}
-		return res, nil
+		return res.SettingValue, nil
 	})
 }
 
@@ -154,7 +154,7 @@ func SetUserSetting(userID int64, key, value string) error {
 		return err
 	}
 
-	_, err := cache.Set(genSettingCacheKey(userID, key), func() (string, error) {
+	_, err := cache.GetString(genSettingCacheKey(userID, key), func() (string, error) {
 		return value, upsertUserSettingValue(userID, key, value)
 	})