sub get_item_by_name
{
	my ($this, $item_name) = @_;
	foreach my $item ( @{$this->{item}} ) {
		if ($item->{name} eq $item_name){
			return $item;
		}
	}
	
	return undef;
}


sub get_user_by_id
{
	my ($this, $user_id) = @_;
	foreach my $user( @{$this->{user}} ) {
		if ($user->{id} == $user_id){
			return $user;
		}
	}
    return undef;
}