Reference ids in subdocuments saved as string

[rrr-bot]

What steps will reproduce the problem?

$model = $this->findModel($intent);
$entity = $this->findOtherModel($id);
$model->parameters = [
[
'entity' => $entity->_id,
'value' => '1'
],
[
'entity' => $entity->_id,
'value' => '2'
],
];
$model->save();

What's expected?

ObjectId

What do you get instead?

String

Additional info

it generates BulkWrite query to MongoDB. All of 'enitity' attributes in array of subdocuments are casted to String 'MongoDB\BSON\ObjectID(abcabcabcabcabcabcabc)'. Is anyone know why and how to fi this?

Q	A
Yii version
Yii MongoDB version
MongoDB server version
PHP version
Operating system

[hoang-rio]

I think you need read MongoId specifics
You must cast _id to string

[rrr-bot]

You didn't get it. It is not string 'abcabcabcabcabcabcabc' which can be cast to ObjectId but string: 'MongoDB\BSON\ObjectID(abcabcabcabcabcabcabc)' which cannot! If I leave 'abcabcabcabcabcabcabc' I will have string in DB not the proper ObjectId. There is now way to save ObjectId as a document property which is an array type. Why it is cast to a string with class name?

[hoang-rio]

You must cast it before set to entity when it is ObjectID:
I think code like

$model = $this->findModel($intent);
$entity = $this->findOtherModel($id);
$model->parameters = [
[
'entity' => (string) $entity->_id,
'value' => '1'
],
[
'entity' => (string) $entity->_id,
'value' => '2'
],
];
$model->save();

may work

[rrr-bot]

Nope, you get string, not the ObjectId. The question is why it is cast to weird string - 'MongoDB\BSON\ObjectID(abcabcabcabcabcabcabc)' rather than leave as ordinary ObjectId?
If you have similar code like this:

$model = $this->findModel($intent);
$entity = $this->findOtherModel($id);
$model->parameters = $entity->_id;
$model->save();

it works (leave ObjectId).