fix: use better code to group UID and stopwatches

- Instead of having code that relied on the result being sorted (which
wasn't specified in the query and therefore not safe to assume so). Use
a map where it doesn't care if the result that we get from the database
is sorted or not.
- Added unit test.

models/issues/TestGetUIDsAndStopwatch/stopwatch.yml

@@ -0,0 +1,11 @@
+-
+  id: 3
+  user_id: 1
+  issue_id: 2
+  created_unix: 1500988004
+
+-
+  id: 4
+  user_id: 3
+  issue_id: 0
+  created_unix: 1500988003

models/issues/stopwatch.go

@@ -60,34 +60,19 @@ func getStopwatch(ctx context.Context, userID, issueID int64) (sw *Stopwatch, ex
 	return sw, exists, err
 }
 
-// UserIDCount is a simple coalition of UserID and Count
-type UserStopwatch struct {
-	UserID      int64
-	StopWatches []*Stopwatch
-}
-
 // GetUIDsAndNotificationCounts between the two provided times
-func GetUIDsAndStopwatch(ctx context.Context) ([]*UserStopwatch, error) {
+func GetUIDsAndStopwatch(ctx context.Context) (map[int64][]*Stopwatch, error) {
 	sws := []*Stopwatch{}
 	if err := db.GetEngine(ctx).Where("issue_id != 0").Find(&sws); err != nil {
 		return nil, err
 	}
+	res := map[int64][]*Stopwatch{}
 	if len(sws) == 0 {
-		return []*UserStopwatch{}, nil
+		return res, nil
 	}
 
-	lastUserID := int64(-1)
-	res := []*UserStopwatch{}
 	for _, sw := range sws {
-		if lastUserID == sw.UserID {
-			lastUserStopwatch := res[len(res)-1]
-			lastUserStopwatch.StopWatches = append(lastUserStopwatch.StopWatches, sw)
-		} else {
-			res = append(res, &UserStopwatch{
-				UserID:      sw.UserID,
-				StopWatches: []*Stopwatch{sw},
-			})
-		}
+		res[sw.UserID] = append(res[sw.UserID], sw)
 	}
 	return res, nil
 }

models/issues/stopwatch_test.go

@@ -4,12 +4,14 @@
 package issues_test
 
 import (
+	"path/filepath"
 	"testing"
 
 	"code.gitea.io/gitea/models/db"
 	issues_model "code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 
 	"github.com/stretchr/testify/assert"
@@ -77,3 +79,41 @@ func TestCreateOrStopIssueStopwatch(t *testing.T) {
 	unittest.AssertNotExistsBean(t, &issues_model.Stopwatch{UserID: 2, IssueID: 2})
 	unittest.AssertExistsAndLoadBean(t, &issues_model.TrackedTime{UserID: 2, IssueID: 2})
 }
+
+func TestGetUIDsAndStopwatch(t *testing.T) {
+	defer unittest.OverrideFixtures(
+		unittest.FixturesOptions{
+			Dir:  filepath.Join(setting.AppWorkPath, "models/fixtures/"),
+			Base: setting.AppWorkPath,
+			Dirs: []string{"models/issues/TestGetUIDsAndStopwatch/"},
+		},
+	)()
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	uidStopwatches, err := issues_model.GetUIDsAndStopwatch(db.DefaultContext)
+	require.NoError(t, err)
+	assert.EqualValues(t, map[int64][]*issues_model.Stopwatch{
+		1: {
+			{
+				ID:          1,
+				UserID:      1,
+				IssueID:     1,
+				CreatedUnix: timeutil.TimeStamp(1500988001),
+			},
+			{
+				ID:          3,
+				UserID:      1,
+				IssueID:     2,
+				CreatedUnix: timeutil.TimeStamp(1500988004),
+			},
+		},
+		2: {
+			{
+				ID:          2,
+				UserID:      2,
+				IssueID:     2,
+				CreatedUnix: timeutil.TimeStamp(1500988002),
+			},
+		},
+	}, uidStopwatches)
+}

modules/eventsource/manager_run.go

@@ -90,8 +90,8 @@ loop:
 					return
 				}
 
-				for _, userStopwatches := range usersStopwatches {
-					apiSWs, err := convert.ToStopWatches(ctx, userStopwatches.StopWatches)
+				for uid, stopwatches := range usersStopwatches {
+					apiSWs, err := convert.ToStopWatches(ctx, stopwatches)
 					if err != nil {
 						if !issues_model.IsErrIssueNotExist(err) {
 							log.Error("Unable to APIFormat stopwatches: %v", err)
@@ -103,7 +103,7 @@ loop:
 						log.Error("Unable to marshal stopwatches: %v", err)
 						continue
 					}
-					m.SendMessage(userStopwatches.UserID, &Event{
+					m.SendMessage(uid, &Event{
 						Name: "stopwatches",
 						Data: string(dataBs),
 					})