retrieving primary key from a DBIx::Class package

[tomgracey]

Dear Monks

I am wondering if there is a way (method?) to retrieve a table's primary key via a DBIx::Class table object. For example, ideally I would like to be able to do something like

my $pk = $schema->resultset('MyPackage')->primary_key;

or perhaps

my $pk =Schema::Result::MyPackage->primary_key;

... or something else?

I'm trying to create a method that outputs a certain data format when any general table name is input. (And, no, I can't really say I understand DBIx::Class terribly well!)

Your help very much appreciated!

[pokki]

You're almost there.

What you need to do is 1. get your ResultSet's data source, i.e. what it gets the actual data from; in DBIC, this is a ResultSource object, and it's what you're describing when you're writing e.g.

package MyApp::Schema::Result::Artist;
use base qw/DBIx::Class::Core/;

# this ResultSource is going to be based on a table, not a view
__PACKAGE__->table('artist');
# the table has these columns
__PACKAGE__->add_columns(qw/ artistid name /);
# and this is the pkey
__PACKAGE__->set_primary_key('artistid');

and then 2. get the pkey info from the ResultSource. So we get:

my $result_source = $schema->resultset('Artist')->result_source;
my @list_of_columns_in_pkey = $result_source->primary_columns;

Edit: I just realized, I assumed you were starting from a ResultSet object, but if you already know its name beforehand:

my $result_source = $schema->source('Artist');
my @list_of_columns_in_pkey = $result_source->primary_columns;

[Anonymous Monk]

Great! Works perfectly - thanks pokki !