admin: New button to delete tries for a flag

libfic/mcq.go

@@ -161,6 +161,29 @@ func (m *MCQ) TeamsOnIt() ([]int64, error) {
 	}
 }
 
+func (m *MCQ) DeleteTries() error {
+	if rows, err := DBQuery("SELECT id_try FROM exercice_tries_mcq WHERE id_mcq = ?", m.Id); err != nil {
+		return err
+	} else {
+		defer rows.Close()
+
+		for rows.Next() {
+			var idtry int64
+			err = rows.Scan(&idtry)
+			if err != nil {
+				return err
+			}
+
+			_, err = DBExec("DELETE FROM exercice_tries WHERE id_try = ?", idtry)
+			if err != nil {
+				return err
+			}
+		}
+
+		return nil
+	}
+}
+
 // Create registers a MCQ into the database and recursively add its entries.
 func (m *MCQ) Create(e *Exercice) (Flag, error) {
 	if res, err := DBExec("INSERT INTO exercice_mcq (id_exercice, ordre, title) VALUES (?, ?, ?)", e.Id, m.Order, m.Title); err != nil {