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The queries are made in Mandango through the document query classes, which inherit from the Mandango\Query class, which is awesome.

The philosophy is simple: be as fast (lazy) and easy (human friendly) as possible, and the results are incredible.

The Mandango\Query class uses the mongo query syntax, so you don't have to learn a new language to start to use it, although you can of course add much more cool stuff on the top of it.

Let's see how it works:

$query = $articleRepository->createQuery(); // Model\ArticleQuery
$query = $articleRepository->createQuery($criteria);

// methods (fluent interface)
    ->criteria(array('is_active' => true))
    ->fields(array('title' => 1))
    ->sort(array('date' => -1))
    ->hint(array('date' => 1))

    ->references() // Mandango's extra

// the real query is only executed in these cases
foreach ($query as $result) { // iterating (IteratorAggregate interface)
$articles = $query->all(); // retrieving all results explicitly
$article = $query->one(); // retrieving one result  explicitly

// counting results (directly, without hydrate)
$nb = $query->count();
$nb = count($query); // Countable interface


MongoDB does not have joins, but Mandango has the best and most efficient way to solve this feature. Usually when you access to a reference, the reference is queried, so if you have to access to several references, you have to make several queries. What does Mandango do? Simply to group the references queries in only one query:

// queries articles
$articles = $articleRepository->createQuery()
foreach ($articles as $article) {
    // query each author, so the number of queries depends on the different authors

// queries articles and their authors
// only two queries, no matter how many authors there are
// authors queried with array('_id' => '$in' => $authorIds)
$articles = $articleRepository->createQuery()
foreach ($articles as $article) {
    $article->getAuthor(); // queried!

Applying logic

Like you have seen, the queries only execute the real database's queries when you iterate or when you do it explicitly. That means that you can play with the queries before they really query something:

$query = $articleRepository->createQuery();

if ($criteria) {
if ($sort) {

// you can apply the logic that you want before to query...

Merging criteria

When we apply logic depending on parameters, sometimes we want just modify part of the criteria. You can use the ->mergeCriteria() method for this:

// normal
$query->criteria(array('author' => $author->getId));
if ($active) {
    $query->criteria(array_merge($query->getCriteria(), array('is_active' => true)));

// merging
$query->criteria(array('author' => $author->getId));
if ($active) {
    $query->mergeCriteria(array('is_active' => true));

Reusing logic

A query class is generated for each document class, so you can save logic on it:

// Model\ArticleQuery
public function active()
    $this->mergeCriteria(array('is_active' => true));

// using
$query->criteria(array('author' => $author->getId));
if ($active) {

References many

Please, remember how :doc:references many work </mandango/working-with-objects>.

The Mandango\\ReferenceGroup class has a createQuery method that just returns a query object to query the referenced documents. So, as the mandango query class is awesome, you can also make awesome stuff with it:

// query and returns all categories
$categories = $article->getCategories()->all();
// just returns a query object to query the referenced categories:
//     array('_id' => array('$in' => $categoryIds))
$categories = $article->getCategories()->createQuery();

// using the query, applying any logic
$categories->mergeCriteria(array('name' => new \MongoRegex('/^A/')));
$categories->sort(array('name' => 1));
$nbCategories = $categories->count();


The relations many just return a query object, so you can use it in the same way:

$articles = $author->getCategories();
$nbArticles = $articles->count();


You can also use the mongo collection directly to do the customized operations you need:

$collection = $articleRepository->getCollection();
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