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Embedded Mapping

This chapter explains how embedded documents are mapped in Doctrine.

Embed One

Embed a single document:

1<?php

/** @Document */
class User
{
    // ...

    /** @EmbedOne(targetDocument="Address") */
    private $address;

    // ...
}

/** @EmbeddedDocument */
class Address
{
    // ...
}


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Embed Many

Embed many documents:

1<?php

/** @Document */
class User
{
    // ...

    /** @EmbedMany(targetDocument="Phonenumber") */
    private $phonenumbers = array();

    // ...
}

/** @EmbeddedDocument */
class Phonenumber
{
    // ...
}


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Mixing Document Types

If you want to store different types of embedded documents in the same field, you can simply omit the targetDocument option:

1<?php

/** @Document */
class User
{
    // ..

    /** @EmbedMany */
    private $tasks = array();

    // ...
}


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Now the $tasks property can store any type of document! The class name will be automatically stored in a field named _doctrine_class_name within the embedded document. The field name can be customized with the discriminatorField option:

1<?php

/** @Document */
class User
{
    // ..

    /**
     * @EmbedMany(discriminatorField="type")
     */
    private $tasks = array();

    // ...
}


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You can also specify a discriminator map to avoid storing the FQCN in each embedded document:

1<?php

/** @Document */
class User
{
    // ..

    /**
     * @EmbedMany(
     *   discriminatorMap={
     *     "download"="DownloadTask",
     *     "build"="BuildTask"
     *   }
     * )
     */
    private $tasks = array();

    // ...
}


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If you have embedded documents without a discriminator value that need to be treated correctly you can optionally specify a default value for the discriminator:

1<?php

/** @Document */
class User
{
    // ..

    /**
     * @EmbedMany(
     *   discriminatorMap={
     *     "download"="DownloadTask",
     *     "build"="BuildTask"
     *   },
     *   defaultDiscriminatorValue="download"
     * )
     */
    private $tasks = array();

    // ...
}


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Cascading Operations

All operations on embedded documents are automatically cascaded. This is because embedded documents are part of their parent document and cannot exist without those by nature.