laravel mongodb push element to existing array in document_ - php

Question

In my mongodb collection I want to push some elements to an existing array. I use jenssegers/Laravel-MongoDB - Eloquent model and Query builder to work with lavavel and mongodb.
How can I use the $push operator in jenssegers/Laravel-MongoDB?
MongoDB entry which shall be updated (RockMongo representation):
{
"_id": ObjectId("5328bc2627784fdb1a6cd398"),
"comments": {
"0": {
"id": 3,
"score": 8
}
},
"created_at": ISODate("2014-03-18T21:35:34.0Z"),
"file": {
"file_id": NumberLong(1175),
"timestamp": NumberLong(1395178534)
}
}
Hint about array representation in rockmongo and mongo shell
RockMongo and mongo shell array representation of the documents are a little bit different. Have a look at the comments-array. The above RockMongo representation appears in the mongo shell as:
{
"_id" : ObjectId("5328c33a27784f3b096cd39b"),
"comments" : [
{
"id" : 3,
"score" : 8
}
],
"created_at" : ISODate("2014-03-18T22:05:46Z"),
"file" : {
"file_id" : NumberLong(1176),
"timestamp" : NumberLong(1395180346)
}
}
As the documentation states the $push operater to push elements to an array. This works fine in the mongo-shell:
Mongo shell
db.Images.update({'file.file_id': 1175},
{ $push: { comments: { id: 3, score: 8} }
})
But in the query-builder I struggle to incorporate the $push operator. I get the error:
localhost:27017: Modified field name may not start with $
I did not find any documentation or example that showed me how to do it..
My jenssegers/Laravel-MongoDB code, that returns the error
// $file_id = 1175
public static function addComment( $file_id ) {
$image = Images::where( 'file.file_id', '=', floatval( $file_id ) )
->update( array('$push' => array( 'comments' => array( 'id' => 4, 'score' => 9 ) ) ) );
return $image;
}

Answer 1

Assuming everything is okay as it works in the shell then use the provided method to push instead:
Images::where('file.file_id', '=', floatval( $file_id ))
->push('comments', array( 'id' => 4, 'score' => 9 ));