I don't know what the difference in the generated code is, and frankly: I don't care ;-)

You should care. That code makes both user_id and role_id a primary key, which means you now have to specify both when you make a call to retrieve. Further, primary keys have a specific definition under relational database theory, and you can't go making just anything a primary key or Bad Things will happen.

You should care....

No, I shouldn't :-), I could!
because, at least in the code I tested, I created the database with SQL myself, knowing about primaray keys, foreign keys etc.

and after that I used a Perl-Module, namely Class::DBI, to access this DB, according to it's documentation; the documentation stated clearly that many-to-many relations aren't supported directly, but how to circumvent this fact using the mappings available via Class::DBI

So I should care about my data-definition, you are right with that, but shouldn't care about the internals of a module I use, if this works as stated in the documentation, and nothing else was my intention to express in my first post.

regards,
tomte

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Hlade's Law:

If you have a difficult task, give it to a lazy person --
they will find an easier way to do it.

The code you tested works because the problem was circumvented without actually solving it. Try retrieving one key from that table instead of accessing it through relationships and the problem will become apparent. With specifying extra params with Primary, you no longer have a Class::DBI object that matches up with your data definition. The definition says that a primary key for this table is made up of a single column, so that's what Class::DBI needs to think, too.

This doesn't have anything to do with how Class::DBI is handling it internally, as all this is plainly documented. I'm not sure what the real solution is (I don't have time to make a test database and run some code against it), but I'm sure this isn't the correct solution.

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: () { :|:& };:

Note: All code is untested, unless otherwise stated

So how fix without Primar?

...john