onDeleteToString function
Convert an on delete constraint to a string
Implementation
String? onDeleteToString(OnDelete onDelete) {
String? res;
switch (onDelete) {
case OnDelete.cascade:
res = "cascade";
break;
case OnDelete.restrict:
res = "restrict";
break;
case OnDelete.setDefault:
res = "set_default";
break;
case OnDelete.setNull:
res = "set_null";
break;
}
return res;
}