Puling an array item matching a value

gistfile1.aw

<?php
    public function testPullTest()
    {
        $doc = new Model_Mongo_Lab();

        $doc->laboratory = new Shanty_Mongo_Document();

        $doc->laboratory->mixtures = array(
            array(
                'id' => 'abc',
                'name' => 'string 1'
            ),
            array(
                'id' => '123',
                'name' => 'string 2'
            ),
        );

        $doc->save();

        $loadedDoc = Model_Mongo_Lab::find($doc->getId());
        $this->assertEquals('string 1', $loadedDoc->laboratory->mixtures[0]->name);

        $doc->addOperation('$pull', 'laboratory.mixtures', array('id'=> 'abc'));
        $doc->save();

        $loadedDoc = Model_Mongo_Lab::find($doc->getId());
        $this->assertEquals('string 2', $loadedDoc->laboratory->mixtures[0]->name);

    }