PHP Lithium: Filtering an existent DocumentSet and get first Match

Question

I am retrieving a DocumentSet in Lithium from MongoDB, but I don't want to process the documents all at once. Instead I would like to have a filter, which I just could tell something like this:

$manyDocuments->giveMeTheOneWhere(array('foo' => 'bar'));

I already tried to do it this way, but it didn't work:

$manyDocuments->find(function($singleDocument){
    return ($singleDocument->foo == 'bar');
});

Even if I manually return true inside the closure, it always returns an empty DocumentSet.

Just to add clarity: I am not looking for a database-operation, instead I want to get one out of an already existent DocumentSet. Is there a fancy way to achieve this or do I need to iterate through the set using a custom function?

score 2 · Answer 1 · answered Apr 03 '12 at 02:04

2

That looks right to me. Is that the exact code you are using?
For example, is the 'bar' value you are using something you are passing in?

answered Apr 03 '12 at 02:04

ton.yeung

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You probably were reminding me that variables are not visible inside the closure unless you don't explicitly announce them using `function($singleDocument) use ($variableToCompare){` Yes, for my test I did use a fix string. – YMMD Apr 03 '12 at 10:09
@YMMD Yea, I was having that problem for when I tried using the find method. How are you troubleshooting the issue? Have you tried putting a break point inside the closure and inspecting your foo field? I've had issues before where my data had typos and the strings don't completely match. – ton.yeung Apr 03 '12 at 16:38

rmarscher · Answer 2 · 2012-04-04T03:35:50.970

I'm on the latest of the master branch of Lithium and wrote this unit test which works for me. I'm not really sure why you're getting an empty DocumentSet.

$docs = new DocumentSet(array('data' => array(
    new Document(array('data' => array(
        'id' => 1,
        'foo' => 'bar'
    ))),
    new Document(array('data' => array(
        'id' => 2,
        'foo' => 'baz'
    ))),
    new Document(array('data' => array(
        'id' => 3,
        'foo' => 'bar'
    ))),
    new Document(array('data' => array(
        'id' => 4,
        'blah' => 'ack'
    )))
)));
$filtered = $docs->find(function($doc) {
    return $doc->foo === 'bar';
});
$expected = array(
    '0' => array('id' => 1, 'foo' => 'bar'),
    '2' => array('id' => 3, 'foo' => 'bar')
);
$this->assertIdentical($expected, $filtered->data());

My bad... somehow I missed the "I am not looking for a database-operation" note. — rmarscher, Apr 04 '12 at 03:17

score 0 · Accepted Answer · answered May 01 '12 at 12:39

0

Instead of using find() I just used first() with a closure. This works as expected. Sadly that was the only thing I didn't try before. Excuse me for answering my own question.

Anyway I'd still be interested in a way to get another Document Set.

answered May 01 '12 at 12:39

YMMD

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PHP Lithium: Filtering an existent DocumentSet and get first Match

3 Answers3