fic: Add theme recursive deletion

libfic/theme.go

@@ -117,3 +117,55 @@ func (t Theme) Delete() (int64, error) {
 		return nb, err
 	}
 }
+
+func (t Theme) deleteFunc(f func(Exercice) (int64, error)) (int64, error) {
+	exercices, err := t.GetExercices()
+	if err != nil {
+		return 0, err
+	}
+
+	for _, exercice := range exercices {
+		_, err := f(exercice)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	return 1, nil
+}
+
+// DeleteCascade the theme from the database, including inner content but not player content.
+func (t Theme) DeleteCascade() (int64, error) {
+	_, err := t.deleteFunc(func(e Exercice) (int64, error) {
+		return e.DeleteCascade()
+	})
+	if err != nil {
+		return 0, err
+	}
+
+	return t.Delete()
+}
+
+// DeleteCascadePlayer delete player content related to this theme.
+func (t Theme) DeleteCascadePlayer() (int64, error) {
+	_, err := t.deleteFunc(func(e Exercice) (int64, error) {
+		return e.DeleteCascadePlayer()
+	})
+	if err != nil {
+		return 0, err
+	}
+
+	return 1, nil
+}
+
+// DeleteDeep the theme from the database, including player content.
+func (t Theme) DeleteDeep() (int64, error) {
+	_, err := t.deleteFunc(func(e Exercice) (int64, error) {
+		return e.DeleteDeep()
+	})
+	if err != nil {
+		return 0, err
+	}
+
+	return t.Delete()
+}