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POjoining on a subquery with dbix-class?
 

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    <p>Given two tables: (incoming greatly reduced/simplified example that exhibits the key problem)</p> <p><strong>app_data</strong> represents applications that can be subscribed to</p> <pre><code>id app_name 1 apple 2 berry 3 cherry </code></pre> <p><strong>app_sub</strong> maps email addresses to applications</p> <pre><code>id email 1 alex 2 bob 2 coby </code></pre> <p>I'd like to generate a table from a single-user point-of-view showing which applications the current user is subscribed to and not.</p> <p>For example, from Alex's perspective I'd like to get:</p> <p><strong>desired_table</strong></p> <pre><code>id app_name is_subscribed 1 apple true 2 berry false 3 cherry false </code></pre> <p>The following pure SQL query seems to be fine:</p> <pre><code>select id, app_name, email from app_data left join ( select * from app_sub where email='alex' ) as subquery on app_name.id=app_data.id; </code></pre> <p>However I'm having great difficulty getting that to work in dbix-class.</p> <p>Alternatively, I tried to eliminate the subquery like so:</p> <pre><code>$app_data_resultset-&gt;search( { -or =&gt; [ { email =&gt; 'alex' }, { email =&gt; undef }, ], }, { select =&gt; [ qw{ me.id me.app_name app_sub.email }, ], as =&gt; [ qw{ id app_name email }, ], join =&gt; 'app_sub', ); </code></pre> <p>However, this (now expectedly) results in the following (after treating both 0 and null as false):</p> <p><strong>bad_table</strong></p> <pre><code>id app_name is_subscribed 1 apple true 3 cherry false </code></pre> <p>Since 'bob' and 'coby' are subscribed to id 2, the where clause completely eliminates the second id.</p> <p>Any help would be greatly appreciated!</p>
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