On 23 Jan 2007, at 21:34, James R. Leu wrote:
Disclaimer:
I'm a noob to DBIx::Class. I checked the archives, but was unable to
find an answer to the following question. If I've overlooked an
obvious
source to my answers, please scold me and point me the the relevant
URL.
Hello,
I'm trying to use DBIx::Class to access a database for which the name
changes based on who is authenticated. In addition the authorization
of the use affects what dynamically name table they 'link' to in
another
database.
I read about DBIx::Class::Schema::Loader, but was unable to grok
how I would define relationships to a dynamically named table.
To better illustrate here is a simplified example:
The following database reside within a common mysql instance.
Database: config_alpha
Table: common
Database: config_beta
Table: common
Database: data
Table: foo_01
Table: foo_88
Table: foo_34
Table: foo_39
Depending which user logged in 'alpha' or 'beta' they would
connect to the appropriate 'config' database. In addition they are
connected the the 'data' database. Depending on additional
authorization data they would have permission to see data in one of
the
'foo' tables. I would like to define a has_many relationship between
entries in the 'common' and the 'foo' table.
I think I can image ways to make some of this work in a stand-alone
script, but I haven't the foggiest idea how to make this work within
a Catalyst environment.
Any pointers would be much appreciated.
Ok, basically, define a has_many across to 'data.PLACEHOLDER', then
wrap ->connect so on the schema object -to be returned-, which will
have a copy of the ResultSource objects, then if your Foo_* tables
are different you'll want -
$schema->source('Common')->relationship_info
('data_has_many_rel_name')->{source} = 'Foo_1';
or similar, or if your foo_* tables are all the same define a single
Foo class and
$schema->source('Foo')->name('data.foo_1');
then return the $schema.
For doing this dynamically in Catalyst on a per-user basis I'd
provide an ACCEPT_CONTEXT method in your DBIC::Schema model -
sub ACCEPT_CONTEXT {
my ($self, $c) = @_;
if ($c->user_exists) {
return $self->copy_and_modify_schema_with_user($c->user);
} else {
return $self;
}
}
--
Matt S Trout, Technical Director, Shadowcat Systems Ltd.
Offering custom development, consultancy and support contracts for
Catalyst,
DBIx::Class and BAST. Contact mst (at) shadowcatsystems.co.uk for
details.
+ Help us build a better perl ORM: http://dbix-
class.shadowcatsystems.co.uk/ +
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