doctrine / mongodb-odm

        /* Add a discriminator value if the embedded document is not mapped

         * explicitly to a targetDocument class.

         */

        if ( ! isset($embeddedMapping['targetDocument'])) {

            $discriminatorField = $embeddedMapping['discriminatorField'];

            $discriminatorValue = isset($embeddedMapping['discriminatorMap'])

                ? array_search($class->name, $embeddedMapping['discriminatorMap'])

                : $class->name;

            /* If the discriminator value was not found in the map, use the full

             * class name. In the future, it may be preferable to throw an

             * exception here (perhaps based on some strictness option).

             *

             * @see DocumentManager::createDBRef()

             */

            if ($discriminatorValue === false) {

                $discriminatorValue = $class->name;

            }

            $embeddedDocumentValue[$discriminatorField] = $discriminatorValue;

        }

        /* If the class has a discriminator (field and value), use it. A child

         * class that is not defined in the discriminator map may only have a

        /* Add a discriminator value if the referenced document is not mapped

         * explicitly to a targetDocument class.

         */

        if ($referenceMapping !== null && ! isset($referenceMapping['targetDocument'])) {

            $discriminatorField = $referenceMapping['discriminatorField'];

            $discriminatorValue = isset($referenceMapping['discriminatorMap'])

                ? array_search($class->name, $referenceMapping['discriminatorMap'])

                : $class->name;

            /* If the discriminator value was not found in the map, use the full

             * class name. In the future, it may be preferable to throw an

             * exception here (perhaps based on some strictness option).

             *

             * @see PersistenceBuilder::prepareEmbeddedDocumentValue()

             */

            if ($discriminatorValue === false) {

                $discriminatorValue = $class->name;

            }

            $dbRef[$discriminatorField] = $discriminatorValue;

        }

        return $dbRef;

    }