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retrieving primary key from a DBIx::Class package

by tomgracey (Beadle)
on Apr 24, 2013 at 10:23 UTC ( #1030339=perlquestion: print w/ replies, xml ) Need Help??
tomgracey has asked for the wisdom of the Perl Monks concerning the following question:

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!

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Re: retrieving primary key from a DBIx::Class package
by pokki (Scribe) on Apr 24, 2013 at 18:30 UTC

    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;
      Great! Works perfectly - thanks pokki !

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