PHP: Deserialization from BSON

Deserialization from BSON

For compound types, there are three data types:

root: refers to the top-level BSON document only
document: refers to embedded BSON documents only
array: refers to a BSON array

Each of those three data types can be mapped against different PHP types. The possible mapping values are:

not set or NULL (the is the default)

A BSON array will be deserialized as a PHP array.
A BSON document (root or embedded) without a __pclass property ^[1] becomes a PHP stdClass object, with each BSON document key set as a public stdClass property.
A BSON document (root or embedded) with a __pclass property ^[1] becomes a PHP object of the class name as defined by the __pclass property.

If the named class implements the MongoDB\BSON\Persistable interface, then the properties of the BSON document, including the __pclass property, are sent as an associative array to the MongoDB\BSON\Unserializable::bsonUnserialize() function to initialise the object's properties.

If the named class does not exist or does not implement the MongoDB\BSON\Persistable interface, stdClass will be used and each BSON document key (including __pclass) will be set as a public stdClass property.

"array"

Turns a BSON array or BSON document into a PHP array. There will be no special treatment of a __pclass property ^[1], but it may be set as an element in the returned array if it was present in the BSON document.

"object" or "stdClass"

Turns a BSON array or BSON document into a stdClass object. There will be no special treatment of a __pclass property ^[1], but it may be set as a public property in the returned object if it was present in the BSON document.

any other string

Defines the class name that the BSON array or BSON object should be deserialized as. For BSON objects that include __pclass properties, that class will take priority.

If the named class does not exist, is not concrete (i.e. it is abstract or an interface), or does not implement MongoDB\BSON\Unserializable then an MongoDB\Driver\Exception\InvalidArgumentException exception is thrown.

If the BSON object has a __pclass property and that class exists and implements MongoDB\BSON\Persistable it will supersede the class provided in the type map.

The properties of the BSON document, including the __pclass property if it exists, will be sent as an associative array to the MongoDB\BSON\Unserializable::bsonUnserialize() function to initialise the object's properties.

TypeMaps

TypeMaps can be set through the MongoDB\Driver\Cursor::setTypeMap() method on a MongoDB\Driver\Cursor object, or the $typeMap argument of MongoDB\BSON\toPHP(). Each of the three classes (root, document and array) can be individually set.

If the value in the map is NULL, it means the same as the default value for that item.

Examples

These examples use the following classes:

MyClass: which does not implement any interface
YourClass: which implements MongoDB\BSON\Unserializable
OurClass: which implements MongoDB\BSON\Persistable
TheirClass: which extends OurClass

The MongoDB\BSON\Unserializable::bsonUnserialize() method of YourClass, OurClass, TheirClass iterate over the array and set the properties without modifications. It also sets the $unserialized property to true:


<?php

function bsonUnserialize( array $map )
{
    foreach ( $map as $k => $value )
    {
        $this->$k = $value;
    }
    $this->unserialized = true;
}

/* typemap: [] (all defaults) */
{ "foo": "yes", "bar" : false }
  -> stdClass { $foo => 'yes', $bar => false }

{ "foo": "no", "array" : [ 5, 6 ] }
  -> stdClass { $foo => 'no', $array => [ 5, 6 ] }

{ "foo": "no", "obj" : { "embedded" : 3.14 } }
  -> stdClass { $foo => 'no', $obj => stdClass { $embedded => 3.14 } }

{ "foo": "yes", "__pclass": "MyClass" }
  -> stdClass { $foo => 'yes', $__pclass => 'MyClass' }

{ "foo": "yes", "__pclass": { "$type" : "80", "$binary" : "MyClass" } }
  -> stdClass { $foo => 'yes', $__pclass => Binary(0x80, 'MyClass') }

{ "foo": "yes", "__pclass": { "$type" : "80", "$binary" : "YourClass") }
  -> stdClass { $foo => 'yes', $__pclass => Binary(0x80, 'YourClass') }

{ "foo": "yes", "__pclass": { "$type" : "80", "$binary" : "OurClass") }
  -> OurClass { $foo => 'yes', $__pclass => Binary(0x80, 'OurClass'), $unserialized => true }

{ "foo": "yes", "__pclass": { "$type" : "44", "$binary" : "YourClass") }
  -> stdClass { $foo => 'yes', $__pclass => Binary(0x44, 'YourClass') }

/* typemap: [ "root" => "MissingClass" ] */
{ "foo": "yes" }
  -> MongoDB\Driver\Exception\InvalidArgumentException("MissingClass does not exist")

/* typemap: [ "root" => "MyClass" ] */
{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "MyClass" } }
  -> MongoDB\Driver\Exception\InvalidArgumentException("MyClass does not implement Unserializable interface")

/* typemap: [ "root" => "MongoDB\BSON\Unserializable" ] */
{ "foo": "yes" }
  -> MongoDB\Driver\Exception\InvalidArgumentException("Unserializable is not a concrete class")

/* typemap: [ "root" => "YourClass" ] */
{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "MongoDB\BSON\Unserializable" } }
  -> YourClass { $foo => "yes", $__pclass => Binary(0x80, "MongoDB\BSON\Unserializable"), $unserialized => true }

/* typemap: [ "root" => "YourClass" ] */
{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "MyClass" } }
  -> YourClass { $foo => "yes", $__pclass => Binary(0x80, "MyClass"), $unserialized => true }

/* typemap: [ "root" => "YourClass" ] */
{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "OurClass" } }
  -> OurClass { $foo => "yes", $__pclass => Binary(0x80, "OurClass"), $unserialized => true }

/* typemap: [ "root" => "YourClass" ] */
{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "TheirClass" } }
  -> TheirClass { $foo => "yes", $__pclass => Binary(0x80, "TheirClass"), $unserialized => true }

/* typemap: [ "root" => "OurClass" ] */
{ foo: "yes", "__pclass" : { "$type": "80", "$binary": "TheirClass" } }
  -> TheirClass { $foo => "yes", $__pclass => Binary(0x80, "TheirClass"), $unserialized => true }

/* typemap: [ 'root' => 'YourClass' ] */
{ foo: "yes", "__pclass" : { "$type": "80", "$binary": "YourClass" } }
  -> YourClass { $foo => 'yes', $__pclass => Binary(0x80, 'YourClass'), $unserialized => true }

/* typemap: [ 'root' => 'array', 'document' => 'array' ] */
{ "foo": "yes", "bar" : false }
  -> [ "foo" => "yes", "bar" => false ]

{ "foo": "no", "array" : [ 5, 6 ] }
  -> [ "foo" => "no", "array" => [ 5, 6 ] ]

{ "foo": "no", "obj" : { "embedded" : 3.14 } }
  -> [ "foo" => "no", "obj" => [ "embedded => 3.14 ] ]

{ "foo": "yes", "__pclass": "MyClass" }
  -> [ "foo" => "yes", "__pclass" => "MyClass" ]

{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "MyClass" } }
  -> [ "foo" => "yes", "__pclass" => Binary(0x80, "MyClass") ]

{ "foo": "yes", "__pclass" : { "$type": "80", "$binary": "OurClass" } }
  -> [ "foo" => "yes", "__pclass" => Binary(0x80, "OurClass") ]

/* typemap: [ 'root' => 'object', 'document' => 'object' ] */
{ "foo": "yes", "__pclass": { "$type": "80", "$binary": "MyClass" } }
  -> stdClass { $foo => "yes", "__pclass" => Binary(0x80, "MyClass") }

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User Contributed Notes 3 notes

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Miguel ¶

6 years ago


Make sure you include the field "__pclass" to the projection if you want the ODM to automatically call the bsonUnserialize of the class.

If you don't get that field in the query, the ODM will never know which class to call, so you'll have to specify it with the "typemap" variable.

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hello at stefandjokic dot com ¶

4 years ago


Minor correction to my previous comment:

Use 'fieldPaths' for specifying type of nested property.

Eg.

'typeMap' => [
                'array' => 'array',
                'fieldPaths' => [
                    'notifications.email.to' => 'array',
                    'notifications.data.params' => 'array',
                ],
            ],

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hello at stefandjokic dot com ¶

4 years ago


You can also specify the type map for nested document item, e.g.

<?php
.
.
.
// everything else is by default an object
'typeMap' => [
                'customer.phones' => 'array',
            ],

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