Hi again Bliako,

"... Unless a JOIN can take additional conditions (like a WHERE comment_type='play' ..."

Heh. No reason to use DBIx::Class if not to make things easy ;-). Also please familiarize yourself with SQL::Abstract, which builds the SQL used by DBIx. That's where you'll learn how to build complex where clauses. The DBIx manuals have the info on join and prefetch and the relationships that DBIx creates for you. Note in the code below that the "join" is actually a DBIx relationship and thus the identifier "event" is the name of the relationship, not of the table (although it may be the same value, as here).

Using the schema I created above: 

use strict;
use warnings;
use feature 'say';
use Bliako::Schema;

my $db = Bliako::Schema->connect(
    'DBI:mysql:database=Bliako', undef, undef,
        { RaiseError => 1 },
);

my @comments = $db->resultset('Comment')->search({
    'event.type' => 'concert',
    'event.name' => 'Rolling Stones',
}, {
    join => 'event',
});

say sprintf(
    '%s said about the %s concert: "%s"',
    $_->user->name, $_->event->name, $_->text,
) for @comments;

[download]

Output: 

$ perl -I. bliako-2.pl

Bliako said about the Rolling Stones concert: "Greatest rock and roll 
+band in the world!"
1nickt said about the Rolling Stones concert: "There is cool, then the
+re is Charlie Watts."

[download]

Hope this helps!


The way forward always starts with a minimal test.

In reply to Re^3: DB: what kind of relationship? by 1nickt
in thread DB: what kind of relationship? by bliako

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.