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<div class="section" id="inheritance-mapping">
<span id="id1"></span><h1>Inheritance Mapping<a class="headerlink" href="#inheritance-mapping" title="Permalink to this headline"></a></h1>
<p>Doctrine currently offers two supported methods of inheritance:
<a class="reference internal" href="#single-collection-inheritance"><span class="std std-ref">single collection</span></a> and
<a class="reference internal" href="#collection-per-class-inheritance"><span class="std std-ref">collection per class</span></a> inheritance.</p>
<div class="section" id="mapped-superclasses">
<h2>Mapped Superclasses<a class="headerlink" href="#mapped-superclasses" title="Permalink to this headline"></a></h2>
<p>A mapped superclass is an abstract or concrete class that provides mapping
information for its subclasses, but is not itself a document. Typically, the
purpose of such a mapped superclass is to define state and mapping information
that is common to multiple document classes.</p>
<p>Just like non-mapped classes, mapped superclasses may appear in the middle of
an otherwise mapped inheritance hierarchy (through
<a class="reference internal" href="#single-collection-inheritance"><span class="std std-ref">single collection</span></a> or
<a class="reference internal" href="#collection-per-class-inheritance"><span class="std std-ref">collection per class</span></a>) inheritance.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">A mapped superclass cannot be a document and is not queryable.</p>
</div>
<p>Example:</p>
<div class="configuration-block">
<ul class="simple">
<li><em>PHP</em><div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">namespace</span> <span class="nx">Documents</span><span class="p">;</span>
<span class="sd">/** @MappedSuperclass */</span>
<span class="k">abstract</span> <span class="k">class</span> <span class="nc">BaseDocument</span>
<span class="p">{</span>
<span class="p">}</span>
</pre></div>
</div>
</li>
<li><em>XML</em><div class="highlight-xml"><div class="highlight"><pre><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;mapped-superclass</span> <span class="na">name=</span><span class="s">&quot;Documents\BaseDocument&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;/mapped-superclass&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
</pre></div>
</div>
</li>
<li><em>YAML</em><div class="highlight-yaml"><div class="highlight"><pre><span class="l l-Scalar l-Scalar-Plain">Documents\BaseDocument</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">mappedSuperclass</span>
</pre></div>
</div>
</li>
</ul>
</div>
</div>
<div class="section" id="single-collection-inheritance">
<span id="id2"></span><h2>Single Collection Inheritance<a class="headerlink" href="#single-collection-inheritance" title="Permalink to this headline"></a></h2>
<p>In single collection inheritance, each document is stored in a single collection
and a discriminator field is used to distinguish one document type from another.</p>
<p>Simple example:</p>
<div class="configuration-block">
<ul class="simple">
<li><em>PHP</em><div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">namespace</span> <span class="nx">Documents</span><span class="p">;</span>
<span class="sd">/**</span>
<span class="sd"> * @Document</span>
<span class="sd"> * @InheritanceType(&quot;SINGLE_COLLECTION&quot;)</span>
<span class="sd"> * @DiscriminatorField(&quot;type&quot;)</span>
<span class="sd"> * @DiscriminatorMap({&quot;person&quot;=&quot;Person&quot;, &quot;employee&quot;=&quot;Employee&quot;})</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Person</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="p">}</span>
<span class="sd">/**</span>
<span class="sd"> * @Document</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Employee</span> <span class="k">extends</span> <span class="nx">Person</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="p">}</span>
</pre></div>
</div>
</li>
<li><em>XML</em><div class="highlight-xml"><div class="highlight"><pre><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Person&quot;</span> <span class="na">inheritance-type=</span><span class="s">&quot;SINGLE_COLLECTION&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;discriminator-field</span> <span class="na">name=</span><span class="s">&quot;type&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;discriminator-map&gt;</span>
<span class="nt">&lt;discriminator-mapping</span> <span class="na">value=</span><span class="s">&quot;person&quot;</span> <span class="na">class=</span><span class="s">&quot;Person&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;discriminator-mapping</span> <span class="na">value=</span><span class="s">&quot;employee&quot;</span> <span class="na">class=</span><span class="s">&quot;Employee&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/discriminator-map&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
<span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Employee&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
</pre></div>
</div>
</li>
<li><em>YAML</em><div class="highlight-yaml"><div class="highlight"><pre><span class="l l-Scalar l-Scalar-Plain">Documents\Person</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">document</span>
<span class="l l-Scalar l-Scalar-Plain">inheritanceType</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">SINGLE_COLLECTION</span>
<span class="l l-Scalar l-Scalar-Plain">discriminatorField</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">type</span>
<span class="l l-Scalar l-Scalar-Plain">discriminatorMap</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">person</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">Person</span>
<span class="l l-Scalar l-Scalar-Plain">employee</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">Employee</span>
</pre></div>
</div>
</li>
</ul>
</div>
<p>The discriminator value allows Doctrine to infer the class name to instantiate
when hydrating a document. If a discriminator map is used, the discriminator
value will be used to look up the class name in the map.</p>
<p>Now, if we query for a Person and its discriminator value is <code class="docutils literal"><span class="pre">employee</span></code>, we
would get an Employee instance back:</p>
<div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="nv">$employee</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Employee</span><span class="p">();</span>
<span class="c1">// ...</span>
<span class="nv">$dm</span><span class="o">-&gt;</span><span class="na">persist</span><span class="p">(</span><span class="nv">$employee</span><span class="p">);</span>
<span class="nv">$dm</span><span class="o">-&gt;</span><span class="na">flush</span><span class="p">();</span>
<span class="nv">$employee</span> <span class="o">=</span> <span class="nv">$dm</span><span class="o">-&gt;</span><span class="na">find</span><span class="p">(</span><span class="s1">&#39;Person&#39;</span><span class="p">,</span> <span class="nv">$employee</span><span class="o">-&gt;</span><span class="na">getId</span><span class="p">());</span> <span class="c1">// instanceof Employee</span>
</pre></div>
</div>
<p>Even though we queried for a Person, Doctrine will know to return an Employee
instance because of the discriminator map!</p>
<p>If your document structure has changed and you've added discriminators after
already having a bunch of documents, you can specify a default value for the
discriminator field:</p>
<div class="configuration-block">
<ul class="simple">
<li><em>PHP</em><div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">namespace</span> <span class="nx">Documents</span><span class="p">;</span>
<span class="sd">/**</span>
<span class="sd"> * @Document</span>
<span class="sd"> * @InheritanceType(&quot;SINGLE_COLLECTION&quot;)</span>
<span class="sd"> * @DiscriminatorField(&quot;type&quot;)</span>
<span class="sd"> * @DiscriminatorMap({&quot;person&quot;=&quot;Person&quot;, &quot;employee&quot;=&quot;Employee&quot;})</span>
<span class="sd"> * @DefaultDiscriminatorValue(&quot;person&quot;)</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Person</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="p">}</span>
<span class="sd">/**</span>
<span class="sd"> * @Document</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Employee</span> <span class="k">extends</span> <span class="nx">Person</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="p">}</span>
</pre></div>
</div>
</li>
<li><em>XML</em><div class="highlight-xml"><div class="highlight"><pre><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Person&quot;</span> <span class="na">inheritance-type=</span><span class="s">&quot;SINGLE_COLLECTION&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;discriminator-field</span> <span class="na">name=</span><span class="s">&quot;type&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;discriminator-map&gt;</span>
<span class="nt">&lt;discriminator-mapping</span> <span class="na">value=</span><span class="s">&quot;person&quot;</span> <span class="na">class=</span><span class="s">&quot;Person&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;discriminator-mapping</span> <span class="na">value=</span><span class="s">&quot;employee&quot;</span> <span class="na">class=</span><span class="s">&quot;Employee&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/discriminator-map&gt;</span>
<span class="nt">&lt;default-discriminator-value</span> <span class="na">value=</span><span class="s">&quot;person&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
<span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Employee&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
</pre></div>
</div>
</li>
<li><em>YAML</em><div class="highlight-yaml"><div class="highlight"><pre><span class="l l-Scalar l-Scalar-Plain">Documents\Person</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">document</span>
<span class="l l-Scalar l-Scalar-Plain">inheritanceType</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">SINGLE_COLLECTION</span>
<span class="l l-Scalar l-Scalar-Plain">discriminatorField</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">type</span>
<span class="l l-Scalar l-Scalar-Plain">defaultDiscriminatorValue</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">person</span>
<span class="l l-Scalar l-Scalar-Plain">discriminatorMap</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">person</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">Person</span>
<span class="l l-Scalar l-Scalar-Plain">employee</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">Employee</span>
</pre></div>
</div>
</li>
</ul>
</div>
</div>
<div class="section" id="collection-per-class-inheritance">
<span id="id3"></span><h2>Collection Per Class Inheritance<a class="headerlink" href="#collection-per-class-inheritance" title="Permalink to this headline"></a></h2>
<p>With collection per class inheritance, each document is stored in its own
collection and contains all inherited fields:</p>
<div class="configuration-block">
<ul class="simple">
<li><em>PHP</em><div class="highlight-php"><div class="highlight"><pre><span class="cp">&lt;?php</span>
<span class="k">namespace</span> <span class="nx">Documents</span><span class="p">;</span>
<span class="sd">/**</span>
<span class="sd"> * @Document</span>
<span class="sd"> * @InheritanceType(&quot;COLLECTION_PER_CLASS&quot;)</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Person</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="p">}</span>
<span class="sd">/**</span>
<span class="sd"> * @Document</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Employee</span> <span class="k">extends</span> <span class="nx">Person</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="p">}</span>
</pre></div>
</div>
</li>
<li><em>XML</em><div class="highlight-xml"><div class="highlight"><pre><span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Person&quot;</span> <span class="na">inheritance-type=</span><span class="s">&quot;COLLECTION_PER_CLASS&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
<span class="cp">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span>
<span class="nt">&lt;doctrine-mongo-mapping</span> <span class="na">xmlns=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping&quot;</span>
<span class="na">xmlns:xsi=</span><span class="s">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span>
<span class="na">xsi:schemaLocation=</span><span class="s">&quot;http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping</span>
<span class="s"> http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;document</span> <span class="na">name=</span><span class="s">&quot;Documents\Employee&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;/document&gt;</span>
<span class="nt">&lt;/doctrine-mongo-mapping&gt;</span>
</pre></div>
</div>
</li>
<li><em>YAML</em><div class="highlight-yaml"><div class="highlight"><pre><span class="l l-Scalar l-Scalar-Plain">Documents\Person</span><span class="p p-Indicator">:</span>
<span class="l l-Scalar l-Scalar-Plain">type</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">document</span>
<span class="l l-Scalar l-Scalar-Plain">inheritanceType</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">COLLECTION_PER_CLASS</span>
</pre></div>
</div>
</li>
</ul>
</div>
<p>A discriminator is not needed with this type of inheritance since the data is
separated in different collections.</p>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="../index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Inheritance Mapping</a><ul>
<li><a class="reference internal" href="#mapped-superclasses">Mapped Superclasses</a></li>
<li><a class="reference internal" href="#single-collection-inheritance">Single Collection Inheritance</a></li>
<li><a class="reference internal" href="#collection-per-class-inheritance">Collection Per Class Inheritance</a></li>
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