Fix label count (#8267)

* fix label count

* fix vendor

* fix import order

* update xorm to fix bug

* fix tests

* fix mssql bug

models/issue.go

@@ -760,11 +760,6 @@ func (issue *Issue) changeStatus(e *xorm.Session, doer *User, isClosed bool) (er
 		return err
 	}
 	for idx := range issue.Labels {
-		if issue.IsClosed {
-			issue.Labels[idx].NumClosedIssues++
-		} else {
-			issue.Labels[idx].NumClosedIssues--
-		}
 		if err = updateLabel(e, issue.Labels[idx]); err != nil {
 			return err
 		}

models/issue_label.go

@@ -14,6 +14,7 @@ import (
 	api "code.gitea.io/gitea/modules/structs"
 
 	"github.com/go-xorm/xorm"
+	"xorm.io/builder"
 )
 
 var labelColorPattern = regexp.MustCompile("#([a-fA-F0-9]{6})")
@@ -294,7 +295,20 @@ func GetLabelsByIssueID(issueID int64) ([]*Label, error) {
 }
 
 func updateLabel(e Engine, l *Label) error {
-	_, err := e.ID(l.ID).AllCols().Update(l)
+	_, err := e.ID(l.ID).
+		SetExpr("num_issues",
+			builder.Select("count(*)").From("issue_label").
+				Where(builder.Eq{"label_id": l.ID}),
+		).
+		SetExpr("num_closed_issues",
+			builder.Select("count(*)").From("issue_label").
+				InnerJoin("issue", "issue_label.issue_id = issue.id").
+				Where(builder.Eq{
+					"issue_label.label_id": l.ID,
+					"issue.is_closed":      true,
+				}),
+		).
+		AllCols().Update(l)
 	return err
 }
 
@@ -375,10 +389,6 @@ func newIssueLabel(e *xorm.Session, issue *Issue, label *Label, doer *User) (err
 		return err
 	}
 
-	label.NumIssues++
-	if issue.IsClosed {
-		label.NumClosedIssues++
-	}
 	return updateLabel(e, label)
 }
 
@@ -448,10 +458,6 @@ func deleteIssueLabel(e *xorm.Session, issue *Issue, label *Label, doer *User) (
 		return err
 	}
 
-	label.NumIssues--
-	if issue.IsClosed {
-		label.NumClosedIssues--
-	}
 	return updateLabel(e, label)
 }
 

models/issue_label_test.go

@@ -205,6 +205,7 @@ func TestNewIssueLabel(t *testing.T) {
 		LabelID:  label.ID,
 		Content:  "1",
 	})
+	label = AssertExistsAndLoadBean(t, &Label{ID: 2}).(*Label)
 	assert.EqualValues(t, prevNumIssues+1, label.NumIssues)
 
 	// re-add existing IssueLabel