createProperty method
Implementation
ModelProperty createProperty(String name, [int uid = 0]) {
final id = lastPropertyId.id + 1;
if (uid != 0 && model.containsUid(uid)) {
throw StateError('uid already exists: $uid');
}
final uniqueUid = uid == 0 ? model.generateUid() : uid;
final property =
ModelProperty.create(IdUid(id, uniqueUid), name, 0, entity: this);
properties.add(property);
lastPropertyId = property.id;
return property;
}