Fix column name ambiguity in GetUserIssueStats() (#8347)

* Add test for FilterModeMention

* Fix column name ambiguity

* Fix fmt

models/issue.go

 			return nil, err
 		}
 	case FilterModeAssign:
-		stats.OpenCount, err = x.Where(cond).And("is_closed = ?", false).
+		stats.OpenCount, err = x.Where(cond).And("issue.is_closed = ?", false).
 			Join("INNER", "issue_assignees", "issue.id = issue_assignees.issue_id").
 			And("issue_assignees.assignee_id = ?", opts.UserID).
 			Count(new(Issue))
 		if err != nil {
 			return nil, err
 		}
-		stats.ClosedCount, err = x.Where(cond).And("is_closed = ?", true).
+		stats.ClosedCount, err = x.Where(cond).And("issue.is_closed = ?", true).
 			Join("INNER", "issue_assignees", "issue.id = issue_assignees.issue_id").
 			And("issue_assignees.assignee_id = ?", opts.UserID).
 			Count(new(Issue))
 			return nil, err
 		}
 	case FilterModeMention:
-		stats.OpenCount, err = x.Where(cond).And("is_closed = ?", false).
+		stats.OpenCount, err = x.Where(cond).And("issue.is_closed = ?", false).
 			Join("INNER", "issue_user", "issue.id = issue_user.issue_id and issue_user.is_mentioned = ?", true).
 			And("issue_user.uid = ?", opts.UserID).
 			Count(new(Issue))
 		if err != nil {
 			return nil, err
 		}
-		stats.ClosedCount, err = x.Where(cond).And("is_closed = ?", true).
+		stats.ClosedCount, err = x.Where(cond).And("issue.is_closed = ?", true).
 			Join("INNER", "issue_user", "issue.id = issue_user.issue_id and issue_user.is_mentioned = ?", true).
 			And("issue_user.uid = ?", opts.UserID).
 			Count(new(Issue))

models/issue_test.go

 				ClosedCount:           2,
 			},
 		},
+		{
+			UserIssueStatsOptions{
+				UserID:     1,
+				FilterMode: FilterModeMention,
+			},
+			IssueStats{
+				YourRepositoriesCount: 0,
+				AssignCount:           2,
+				CreateCount:           2,
+				OpenCount:             0,
+				ClosedCount:           0,
+			},
+		},
 	} {
 		stats, err := GetUserIssueStats(test.Opts)
 		if !assert.NoError(t, err) {