W bazie jest tabela:
Countries - country_id | country_name
i
Voivodships - voivod_id | country_id | itd.

<!--Geshi:233516:php--><pre class="php-brief" style="font-family:monospace;"><div class="head">

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 [topic=0]o</span> <span class="sy0">=</span> [url="http://www.php.net/array"]<span class="kw3">array</span>[/url]<span class="br0">(</span><span class="st0">'country'</span><span class="br0">)</span><span class="sy0">;</span></div><li class="li1"><div class="de1">	protected <span class="re0">$primary_key</span> <span class="sy0">=</span> <span class="st0">'voivod_id'</span><span class="sy0">;</span></div>
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Robię:
 
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       $this -> countries = ORM::factory("country");
 
       $countries = $this -> countries -> getAll();
       foreach($countries as $c) {
              echo $c->country_id;
              foreach($c->voivodships as $d){ echo $d->voivod_name; }
       }
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I otrzymuje:

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Wystąpił błąd SQL: Nieznana kolumna 'voivodships.country_country_id' w where clause - SELECT `voivodships`.* FROM (`voivodships`) WHERE `voivodships`.`country_country_id` = 1 ORDER BY `voivodships`.`voivod_id` ASC
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@edit

ok, protected $foreign_key = array('voivodships' => 'country_id');