@Override
public int hashCode() {
int result = id != null ? id.hashCode() : 0;
result = 31 * result + (name != null ? name.hashCode() : 0);
result = 31 * result + (creationTime != null ? creationTime.hashCode() : 0);
result = 31 * result + (profile != null ? profile.hashCode() : 0);
result = 31 * result + (booksCount != null ? booksCount.hashCode() : 0);
return result;
}