Mastering MongoDB 4.x - Second Edition

Inheritance with Doctrine

Modeling one-to-one and one-to-many relationships can be done via annotations, YAML, or XML. Using annotations, we can define multiple embedded sub-documents within our document, as shown in the following example:

/** @Document */class User{   // ...   /** @EmbedMany(targetDocument="Phonenumber") */   private $phonenumbers = array();   // ...}/** @EmbeddedDocument */class Phonenumber{   // ...}

Here, a User document embeds many phonenumbers. @EmbedOne() will embed one sub-document to be used for modeling one-to-one relationships.

Referencing is similar to embedding, as shown in the following example:

/** @Document */class User{   // ...   /**    * @ReferenceMany(targetDocument="Account")    */   private $accounts = array();   // ...}