On 4/16/07 10:02 AM, Jonathan Vanasco wrote:
> MyRose::Object::Product
> relationships => [
> colors => {
> type => 'many to many',
> map_class => 'MyRose::Object:: Product2Color',
> map_from => 'product_id',
> map_to => 'color_id',
> },
> ],
>
> MyRose::Object::Color
> relationships => [
> products => {
> type => 'many to many',
> map_class => 'MyRose::Object:: Product2Color',
> map_from => 'color_id',
> map_to => 'product_id',
> },
> ],
The map_from and map_to parameters take "the name of the 'many to one'
relationship or foreign key...", not the name of a column. (This allows
multi-column relationships and fks in mapping tables.)
http://search.cpan.org/dist/Rose-DB-Object/lib/Rose/DB/Object/Metadata/Relat
ionship/ManyToMany.pm#map_from
http://search.cpan.org/dist/Rose-DB-Object/lib/Rose/DB/Object/Metadata/Relat
ionship/ManyToMany.pm#map_to
So, for example, look in Product2Color and find the name of the fk or rel
that points to a Color object. The name of that rel or fk is the value for
your map_to param here:
MyRose::Object::Product
relationships => [
colors => {
type => 'many to many',
map_class => 'MyRose::Object:: Product2Color',
map_to => 'color', # fk or rel name in Product2Color
...
> MyRose::Object::Product::Manager
> $results= Rose::DB::Object::Manager->get_objects(
> object_class=> object_class(),
> with_objects=> [ 'colors.color'],
Your with_objects arg would just be "colors" here, which would give you zero
or more Color objects hanging off each Product object.
-John
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