my $club = $c->model("DB::Clubs")
        ->create({ some_data => "asdfasdf",
                   venue => $id });

##</code><code>##

    my $venue = $c->model("DB::Venue")->find($id);
    $venue->add_to_clubs({ some_club_data => "Without venue" });

##</code><code>##

# Inside MySchema::Result::Club.
sub insert {
    my $self = shift;
    return $self if $self->in_storage;
    croak "No venue provided..." unless $self->venue;
    my $schema = $self->result_source->schema;
    croak "Venue is invalid..."
        unless $schema->resultset("Venue")->find($self->venue);
    $self->next::method();
}

sub update {
    my $self = shift;
    my %to_update = $self->get_dirty_columns
        || return $self->next::method(@_);
    $to_update{venue} || return $self->next::method(@_);
    croak "Venue is invalid..."
        unless $schema->resultset("Venue")->find($to_update{venue});
    $self->next::method(@_);
}