[Dbix-class] specify join type

[Bernhard Graf]

Iain wrote:

> This is what we do, however we forgot to turn off cascading on the
> extra relationship e.g.
>
> {cascade_delete => 0, cascade_copy => 0, join_type => 'left'}
>
> and it caused us all kinds of fun.

hehe. ;-)

Is it necessary to put the cascade_* attrs on both sides, or is it 
enough having it in has_many only?

-- 
Bernhard Graf