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

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

# Inside MySchema::Result::Club.
sub insert {
...
        unless $schema->resultset("Venue")->find($to_update{venue});
    $self->next::method(@_);
}