Attributes Reference

#[AlsoLoad]

Specify one or more MongoDB fields to use for loading data if the original field does not exist.

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class User
{
    #[Field(type: 'string')]
    #[AlsoLoad('name')]
    public string $fullName;
}
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The $fullName property will be loaded from fullName if it exists, but fall back to name if it does not exist. If multiple fall back fields are specified, ODM will consider them in order until the first is found.

Additionally, #[AlsoLoad] may annotate a method with one or more field names. Before normal hydration, the field(s) will be considered in order and the method will be invoked with the first value found as its single argument.

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class User
{
    #[AlsoLoad(['name', 'fullName'])]
    public function populateFirstAndLastName(string $name): void
    {
        list($this->firstName, $this->lastName) = explode(' ', $name);
    }
}
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For additional information on using #[AlsoLoad], see Migrations.

#[ChangeTrackingPolicy]

This attribute is used to change the change tracking policy for a document:

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#[Document]
#[ChangeTrackingPolicy('DEFERRED_EXPLICIT')]
class Person
{
    // ...
}
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For a list of available policies, read the section on change tracking policies.

#[DefaultDiscriminatorValue]

This attribute can be used when using #[DiscriminatorField]. It will be used as a fallback value if a document has no discriminator field set. This must correspond to a value from the configured discriminator map.

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#[Document]
#[InheritanceType('SINGLE_COLLECTION')]
#[DiscriminatorField('type')]
#[DiscriminatorMap(['person' => Person::class, 'employee' => Employee::class])]
#[DefaultDiscriminatorValue('person')]
class Person
{
    // ...
}
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#[DiscriminatorField]

This attribute is required for the top-most class in a single collection inheritance hierarchy. It takes a string as its only argument, which specifies the database field to store a class name or key (if a discriminator map is used). ODM uses this field during hydration to select the instantiation class.

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#[Document]
#[InheritanceType("SINGLE_COLLECTION")]
#[DiscriminatorField("type")]
class SuperUser
{
    // ...
}
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#[DiscriminatorMap]

This attribute is required for the top-most class in a single collection inheritance hierarchy. It takes an array as its only argument, which maps keys to class names. The class names must be fully qualified. Using the ::class constant is supported. When a document is persisted to the database, its class name key will be stored in the discriminator field instead of the FQCN. If the discriminator map is non-empty and it does not contain the class name of the persisted document, a \Doctrine\ODM\MongoDB\Mapping\MappingException will be thrown.

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#[Document]
#[InheritanceType('SINGLE_COLLECTION')]
#[DiscriminatorField('type')]
#[DiscriminatorMap(['person' => Person::class, 'employee' => Employee::class])]
class Person
{
    // ...
}
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#[Document]

Required attribute to mark a PHP class as a document, whose persistence will be managed by ODM.

Optional attributes:

• db - By default, the document manager will use the MongoDB database defined in the configuration, but this option may be used to override the database for a particular document class.
• collection - By default, the collection name is derived from the document's class name, but this option may be used to override that behavior.
• repositoryClass - Specifies a custom repository class to use.
• readOnly - Prevents document from being updated: it can only be inserted, upserted or removed.
• writeConcern - Specifies the write concern for this document that overwrites the default write concern specified in the configuration. It does not overwrite a write concern given as option to the flush method when committing your documents.

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#[Document(
    db: 'documents',
    collection: 'users',
    repositoryClass: MyProject\UserRepository::class,
    indexes: [
        new Index(keys: ['username' => 'desc'], options: ['unique' => true])
    ],
    readOnly: true,
)]
class User
{
    //...
}
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#[EmbedMany]

This attribute is similar to #[EmbedOne], but instead of embedding one document, it embeds a collection of documents.

Optional attributes:

• targetDocument - A FQCN of the target document.
• discriminatorField - The database field name to store the discriminator value within the embedded document.
• discriminatorMap - Map of discriminator values to class names.
• defaultDiscriminatorValue - A default value for discriminatorField if no value has been set in the embedded document.
• strategy - The strategy used to persist changes to the collection. Possible values are addToSet, pushAll, set, and setArray. pushAll is the default. See Storage Strategies for more information.
• collectionClass - A FQCN of class that implements Collection interface and is used to hold documents. When typed properties are used it is inherited from PHP type, otherwise Doctrine's ArrayCollection is used by default.
• notSaved - The property is loaded if it exists in the database; however, ODM will not save the property value back to the database.

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class User
{
    /** @var Collection<BookTag|SongTag> */
    #[EmbedMany(
        strategy:'set',
        discriminatorField:'type',
        discriminatorMap: [
            'book' => Documents\BookTag::class,
            'song' => Documents\SongTag::class,
        ],
        defaultDiscriminatorValue: 'book',
    )]
    private Collection $tags;
}
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Depending on the embedded document's class, a value of user or author will be stored in the type field and used to reconstruct the proper class during hydration. The type field need not be mapped on the embedded document classes.

#[EmbedOne]

The #[EmbedOne] attribute works similarly to #[ReferenceOne], except that that document will be embedded within the parent document. Consider the following excerpt from the MongoDB documentation:

The key question in MongoDB schema design is "does this object merit its own collection, or rather should it be embedded within objects in other collections?" In relational databases, each sub-item of interest typically becomes a separate table (unless you are denormalizing for performance). In MongoDB, this is not recommended – embedding objects is much more efficient. Data is then collocated on disk; client-server turnarounds to the database are eliminated. So in general, the question to ask is, "why would I not want to embed this object?"

Optional attributes:

• targetDocument - A FQCN of the target document. When typed properties are used it is inherited from PHP type.
• discriminatorField - The database field name to store the discriminator value within the embedded document.
• discriminatorMap - Map of discriminator values to class names.
• defaultDiscriminatorValue - A default value for discriminatorField if no value has been set in the embedded document.
• notSaved - The property is loaded if it exists in the database; however, ODM will not save the property value back to the database.

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class Thing
{
    #[EmbedOne(
         discriminatorField: 'type',
         discriminatorMap: [
             'user' => Documents\User::class,
             'author' => Documents\Author::class,
         ],
         defaultDiscriminatorValue: 'user',
    )]
    private User|Author $creator;
}
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Depending on the embedded document's class, a value of user or author will be stored in the type field and used to reconstruct the proper class during hydration. The type field need not be mapped on the embedded document classes.

#[EmbeddedDocument]

Marks the document as embeddable. This attribute is required for any documents to be stored within an #[EmbedOne], #[EmbedMany] or #[File\\Metadata] relationship.

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#[EmbeddedDocument]
class Money
{
    #[Field(type: 'float')]
    private float $amount;

    public function __construct(float $amount)
    {
        $this->amount = $amount;
    }
    //...
}

#[Document(db: 'finance', collection: 'wallets')]
class Wallet
{
    #[EmbedOne(targetDocument: Money::class)]
    private Money $money;

    public function setMoney(Money $money): void
    {
        $this->money = $money;
    }
    //...
}
//...
$wallet = new Wallet();
$wallet->setMoney(new Money(34.39));
$dm->persist($wallet);
$dm->flush();
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Unlike normal documents, embedded documents cannot specify their own database or collection. That said, a single embedded document class may be used with multiple document classes, and even other embedded documents!

#[Field]

Marks an annotated instance variable for persistence. Values for this field will be saved to and loaded from the document store as part of the document class' lifecycle.

Optional attributes:

• type - Name of the ODM type, which will determine the value's representation in PHP and BSON (i.e. MongoDB). See Doctrine Mapping Types for a list of types. Defaults to "string" or Type from PHP property type.
• enumType - A FQCN of an enum. ODM will automatically handle conversion from the backing value stored in the database to an enum. Can be auto-detected by type from PHP property type.
• name - By default, the property name is used for the field name in MongoDB; however, this option may be used to specify a database field name.
• nullable - By default, ODM will $unset fields in MongoDB if the PHP value is null. Specify true for this option to force ODM to store a null value in the database instead of unsetting the field.
• notSaved - The property is loaded if it exists in the database; however, ODM will not save the property value back to the database.

Examples:

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#[Document]
class User
{
    #[Field(type: 'string')]
    protected string $username;

    #[Field(type: 'string', name: 'co')]
    protected string $country;

    #[Field(type: 'float')]
    protected float $height;
}
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#[File]

This marks the document as a GridFS file. GridFS allow storing larger amounts of data than regular documents.

Optional attributes:

• db - By default, the document manager will use the MongoDB database defined in the configuration, but this option may be used to override the database for a particular file.
• bucketName - By default, files are stored in a bucket called fs. You can customize that bucket name with this property.
• repositoryClass - Specifies a custom repository class to use. The class must extend the Doctrine\ODM\MongoDB\Repository\GridFSRepository interface.
• readOnly - Prevents the file from being updated: it can only be inserted, upserted or removed.
• writeConcern - Specifies the write concern for this file that overwrites the default write concern specified in the configuration.

#[FileChunkSize]

This maps the chunkSize property of a GridFS file to a property. It contains the size of a single file chunk in bytes. No other options can be set.

#[FileFilename]

This maps the filename property of a GridFS file to a property. No other options can be set.

#[FileLength]

This maps the length property of a GridFS file to a property. It contains the size of the entire file in bytes. No other options can be set.

#[FileMetadata]

This maps the metadata property of a GridFS file to a property. Metadata can be used to store additional properties in a file. The metadata document must be an embedded document mapped using #[EmbeddedDocument].

Optional attributes:

• targetDocument - A FQCN of the target document.
• discriminatorField - The database field name to store the discriminator value within the embedded document.
• discriminatorMap - Map of discriminator values to class names.
• defaultDiscriminatorValue - A default value for discriminatorField if no value has been set in the embedded document.

#[FileUploadDate]

This maps the uploadDate property of a GridFS file to a property. No other options can be set.

#[HasLifecycleCallbacks]

This attribute must be set on the document class to instruct Doctrine to check for lifecycle callback attributes on public methods. Using #[PreFlush], #[PreLoad], #[PostLoad], #[PrePersist], #[PostPersist], #[PreRemove], #[PostRemove], #[PreUpdate], or #[PostUpdate] on methods without this attribute will cause Doctrine to ignore the callbacks.

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#[Document]
#[HasLifecycleCallbacks]
class User
{
    #[PostPersist]
    public function sendWelcomeEmail(): void {}
}
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#[Id]

The annotated instance variable will be marked as the document identifier. The default behavior is to store an MongoDB\BSON\ObjectId instance, but you may customize this via the strategy attribute.

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#[Document]
class User
{
    #[Id]
    protected string $id;
}
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#[Index]

This attribute is used to specify indexes to be created on the collection (or embedding document's collection in the case of #[EmbeddedDocument]). It may also be used at the property-level to define single-field indexes.

Optional attributes:

• keys - Mapping of indexed fields to their ordering or index type. ODM will allow asc and desc to be used in place of 1 and -1, respectively. Special index types (e.g. 2dsphere) should be specified as strings. This is required when #[Index] is used at the class level.
• options - Options for creating the index. Options are documented in the indexes chapter.

The keys and options attributes correspond to the arguments for MongoDB\Collection::createIndex(). ODM allows mapped field names (i.e. PHP property names) to be used when defining keys.

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#[Document]
#[Index(keys: ['username' => 'desc' ], options: ['unique' => true])]
class User
{
    //...
}
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If you are creating a single-field index, you can simply specify an #[Index] or #[UniqueIndex] on a mapped property:

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#[Document]
class User
{
    #[Field(type: 'string')]
    #[UniqueIndex]
    private string $username;
}
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#[Indexes]

This attribute may be used at the class level to specify an array of #[Index] attributes. It is functionally equivalent to specifying multiple #[Index] attributes on a class level.

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#[Document]
#[Indexes([
    new Index(keys: ['username' => 'desc'], options: ['unique' => true]),
])]
class User
{
    //...
}
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#[InheritanceType]

This attribute must appear on the top-most class in an inheritance hierarchy. SINGLE_COLLECTION and COLLECTION_PER_CLASS are currently supported.

Examples:

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#[Document]
#[InheritanceType('COLLECTION_PER_CLASS')]
class Person
{
    // ...
}

#[Document]
#[InheritanceType('SINGLE_COLLECTION')]
#[DiscriminatorField('type')]
#[DiscriminatorMap(['person' => Person::class, 'employee' => Employee::class])]
class Person
{
    // ...
}
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#[Lock]

The annotated instance variable will be used to store lock information for pessimistic locking. This is only compatible with the int type, and cannot be combined with #[Id].

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#[Document]
class Thing
{
    #[Field(type: 'int')]
    #[Lock]
    private int $lock;
}
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#[MappedSuperclass]

The attribute is used to specify classes that are parents of document classes and should not be managed directly. See inheritance mapping for additional information.

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#[MappedSuperclass]
class BaseDocument
{
    // ...
}
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#[PostLoad]

Marks a method on the document class to be called on the postLoad event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PostLoad]
    public function postLoad(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PostPersist]

Marks a method on the document class to be called on the postPersist event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PostPersist]
    public function postPersist(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PostRemove]

Marks a method on the document class to be called on the postRemove event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PostRemove]
    public function postRemove(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PostUpdate]

Marks a method on the document class to be called on the postUpdate event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PostUpdate]
    public function postUpdate(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PreFlush]

Marks a method on the document class to be called on the preFlush event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PreFlush]
    public function preFlush(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PreLoad]

Marks a method on the document class to be called on the preLoad event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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use Doctrine\ODM\MongoDB\Event\PreLoadEventArgs;

#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PreLoad]
    public function preLoad(PreLoadEventArgs $eventArgs): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PrePersist]

Marks a method on the document class to be called on the prePersist event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PrePersist]
    public function prePersist(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PreRemove]

Marks a method on the document class to be called on the preRemove event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PreRemove]
    public function preRemove(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[PreUpdate]

Marks a method on the document class to be called on the preUpdate event. The #[HasLifecycleCallbacks] attribute must be present on the same class for the method to be registered.

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#[Document]
#[HasLifecycleCallbacks]
class Article
{
    // ...

    #[PreUpdate]
    public function preUpdated(): void
    {
        // ...
    }
}
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See Lifecycle Events for more information.

#[ReadPreference]

Specifies Read Preference <https://docs.mongodb.com/manual/core/read-preference/>_ that will be applied when querying for the annotated document.

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namespace Documents;

#[Document]
#[ODM\ReadPreference('primaryPreferred', tags: [
    [ 'dc' => 'east' ],
    [ 'dc' => 'west' ],
    []
])]
class User
{
}
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#[ReferenceMany]

Defines that the annotated instance variable holds a collection of referenced documents.

Optional attributes:

• targetDocument - A FQCN of the target document. A targetDocument is required when using storeAs: id.
• storeAs - Indicates how to store the reference. id stores the identifier, ref an embedded object containing the id field and (optionally) a discriminator. dbRef and dbRefWithDb store a DBRef object and are deprecated in favor of ref. Note that id references are not compatible with the discriminators.
• cascade - Cascade Option
• discriminatorField - The field name to store the discriminator value within the reference object.
• discriminatorMap - Map of discriminator values to class names.
• defaultDiscriminatorValue - A default value for discriminatorField if no value has been set in the referenced document.
• inversedBy - The field name of the inverse side. Only allowed on owning side.
• mappedBy - The field name of the owning side. Only allowed on the inverse side.
• repositoryMethod - The name of the repository method to call to populate this reference.
• sort - The default sort for the query that loads the reference.
• criteria - Array of default criteria for the query that loads the reference.
• limit - Limit for the query that loads the reference.
• skip - Skip for the query that loads the reference.
• strategy - The strategy used to persist changes to the collection. Possible values are addToSet, pushAll, set, and setArray. pushAll is the default. See Storage Strategies for more information.
• collectionClass - A FQCN of class that implements Collection interface and is used to hold documents. When typed properties are used it is inherited from PHP type, otherwise Doctrine's ArrayCollection is used by default
• prime - A list of references contained in the target document that will be initialized when the collection is loaded. Only allowed for inverse references.
• notSaved - The property is loaded if it exists in the database; however, ODM will not save the property value back to the database.

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class User
{
    /** @var Collection<Item> */
    #[ReferenceMany(
        strategy: 'set',
        targetDocument: Item::class,
        cascade: 'all',
        sort: ['sort_field' => 'asc'],
        discriminatorField: 'type',
        discriminatorMap: [
            'book' => BookItem::class,
            'song' => SongItem::class,
        ],
        defaultDiscriminatorValue: 'book',
    )]
    private Collection $cart;
}
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#[ReferenceOne]

Defines an instance variable holds a related document instance.

Optional attributes:

• targetDocument - A FQCN of the target document. A targetDocument is required when using storeAs: id. When typed properties are used it is inherited from PHP type.
• storeAs - Indicates how to store the reference. id stores the identifier, ref an embedded object containing the id field and (optionally) a discriminator. dbRef and dbRefWithDb store a DBRef object and are deprecated in favor of ref. Note that id references are not compatible with the discriminators.
• cascade - Cascade Option
• discriminatorField - The field name to store the discriminator value within the reference object.
• discriminatorMap - Map of discriminator values to class names.
• defaultDiscriminatorValue - A default value for discriminatorField if no value has been set in the referenced document.
• inversedBy - The field name of the inverse side. Only allowed on owning side.
• mappedBy - The field name of the owning side. Only allowed on the inverse side.
• repositoryMethod - The name of the repository method to call to populate this reference.
• sort - The default sort for the query that loads the reference.
• criteria - Array of default criteria for the query that loads the reference.
• limit - Limit for the query that loads the reference.
• skip - Skip for the query that loads the reference.
• notSaved - The property is loaded if it exists in the database; however, ODM will not save the property value back to the database.

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class User
{
    #[ReferenceOne(
        targetDocument: Documents\Item::class,
        cascade: 'all',
        discriminatorField: 'type',
        discriminatorMap: [
            'book' => Documents\BookItem::class,
            'song' => Documents\SongItem::class,
        ],
        defaultDiscriminatorValue: 'book'
    )]
    private Item $cart;
}
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#[SearchIndex]

This attribute is used to specify search indexes for MongoDB Atlas Search.

The attributes correspond to arguments for MongoDB\Collection::createSearchIndex(). Excluding name, attributes are used to create the search index definition.

Optional attributes:

• name - Name of the search index to create, which must be unique to the collection. Defaults to "default".
• dynamic - Enables or disables dynamic field mapping for this index. If true, the index will include all fields with supported data types. If false, the fields attribute must be specified. Defaults to false.
• fields - Associative array of field mappings that specify the fields to index (keys). Required only if dynamic mapping is disabled.
• analyzer - Specifies the analyzer to apply to string fields when indexing. Defaults to the standard analyzer.
• searchAnalyzer - Specifies the analyzer to apply to query text before the text is searched. Defaults to the analyzer attribute, or the standard analyzer. if both are unspecified.
• analyzers - Array of custom analyzers to use in this index.
• storedSource - Specifies document fields to store for queries performed using the returnedStoredSource option. Specify true to store all fields, false to store no fields, or a document to specify individual fields to include or exclude from storage. Defaults to false.
• synonyms - Array of synonym mapping definitions to use in this index.

#[ShardKey]

This attribute may be used at the class level to specify a shard key to be used for sharding the document collection.

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#[Document]
#[ShardKey(keys: ['username' => 'asc'])]
class User
{
    //...
}
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#[UniqueIndex]

Alias of #[Index], with the unique option set by default.

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class User
{
    #[Field(type: 'string')]
    #[UniqueIndex]
    private string $email;
}
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#[Validation]

This attribute may be used at the class level to specify the validation schema for the related collection.

• validator - Specifies a schema that will be used by MongoDB to validate data inserted or updated in the collection. Please refer to the following MongoDB documentation (Schema Validation ¶) for more details. The value should be a string representing a BSON document under the Extended JSON specification. The recommended way to fill up this property is to create a class constant (eg. ::VALIDATOR) using the HEREDOC/NOWDOC syntax for clarity and to reference it as the attribute value.

• action - Determines how MongoDB handles documents that violate the validation rules. Please refer to the related MongoDB documentation (Accept or Reject Invalid Documents ¶) for more details. The allowed values are the following:

  • error
  • warn

  If it is not defined then the default behavior (error) will be used. Those values are also declared as constants for convenience:

  • \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::SCHEMA_VALIDATION_ACTION_ERROR
  • \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::SCHEMA_VALIDATION_ACTION_WARN

  Import the ClassMetadata namespace to use those constants in your attribute.

• level - Determines which operations MongoDB applies the validation rules. Please refer to the related MongoDB documentation (Existing Documents ¶) for more details. The allowed values are the following:

  • off
  • strict
  • moderate

  If it is not defined then the default behavior (strict) will be used. Those values are also declared as constants for convenience:

  • \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::SCHEMA_VALIDATION_LEVEL_OFF
  • \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::SCHEMA_VALIDATION_LEVEL_STRICT
  • \Doctrine\ODM\MongoDB\Mapping\ClassMetadata::SCHEMA_VALIDATION_LEVEL_MODERATE

  Import the ClassMetadata namespace to use those constants in your attribute.

1
<?php

use Doctrine\ODM\MongoDB\Mapping\ClassMetadata;
// ... other imports

#[Document]
#[Validation(
    validator: SchemaValidated::VALIDATOR,
    action: ClassMetadata::SCHEMA_VALIDATION_ACTION_WARN,
    level: ClassMetadata::SCHEMA_VALIDATION_LEVEL_MODERATE,
)]
class SchemaValidated
{
    private const VALIDATOR = <<<'EOT'
        {
            "$jsonSchema": {
                "required": ["name"],
                "properties": {
                    "name": {
                        "bsonType": "string",
                        "description": "must be a string and is required"
                    }
                }
            },
            "$or": [
                { "phone": { "$type": "string" } },
                { "email": { "$regularExpression" : { "pattern": "@mongodb\\.com$", "options": "" } } },
                { "status": { "$in": [ "Unknown", "Incomplete" ] } }
            ]
        }
        EOT;

    // rest of the class code...
}
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#[Version]

The annotated instance variable will be used to store version information for optimistic locking. This is only compatible with types implementing the \Doctrine\ODM\MongoDB\Types\Versionable interface and cannot be combined with #[Id]. Following ODM types can be used for versioning: int, decimal128, date, and date_immutable.

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<?php

class Thing
{
    #[Field(type: 'int')]
    #[Version]
    private int $version;
}
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By default, Doctrine ODM updates embed-many and reference-many collections in separate write operations, which do not bump the document version. Users employing document versioning are encouraged to use the atomicSet or atomicSetArray strategies for such collections, which will ensure that collections are updated in the same write operation as the versioned parent document.

#[View]

Required attribute to mark a PHP class as a view. Views are created from aggregation pipelines, which are returned from a special repository method. Views can be used like collections for any read operations. Result documents are not managed and cannot be referenced using the reference-many and reference-one mappings.

Required attributes:

• rootClass - this is the base collection that the view is created from
• repositoryClass - a repository class is required. This repository must implement the MongoDB\ODM\MongoDB\Repository\ViewRepository interface.

Optional attributes:

• db - By default, the document manager will use the MongoDB database defined in the configuration, but this option may be used to override the database for a particular document class.
• view - By default, the view name is derived from the document's class name, but this option may be used to override that behavior.

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<?php

#[View(
    db: 'documents',
    rootClass: User::class,
    repositoryClass: UserNameRepository::class,
)]
class UserName
{
    //...
}

class UserNameRepository implements \Doctrine\ODM\MongoDB\Repository\ViewRepository
{
    public function createViewAggregation(Builder $builder) : void
    {
        $builder->project()
            ->includeFields(['username']);
    }
}
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The createViewAggregation method can add any aggregation pipeline stage, except for the $out and $merge stages. The pipeline is created for the root class specified in the view mapping.