_id: null

[kdauzickas]

Genghis fails to handle objects that have null for id, e.g. {_id: null}

[bobthecow]

Hmm. That's interesting... Why do you have an object like that? :)

[kdauzickas]

I created it accidentally. A bug nonetheless :)

[bobthecow]

Well, that was dumb. Thanks for reporting it. I'll try to figure out a way to save you from yourself ;)

[kdauzickas]

php also spews out notices about array to string conversion when the id is an array (yup, an array). There is ambiguity in this case. Mongo documentation states: The _id value can be of any type with type ObjectId being the most common. It also states: The _id value may be of any type, other than arrays, so long as it is a unique. And the actual db ignores the last statement allowing to save objects with array ids.

[bobthecow]

Two things on the array id:

1. You're not using an array id. You're using a hash ID :)

2. What you're seeing is a failure of the PHP Mongo driver. The "array" representation of a cursor — what you get when you do iterator_to_array — uses the document IDs as the array index. You can imagine how much that would mess things up if you tried to do something like this:

   $foo[array('some' => 'value')] = $document;
   

   It works most of the time because ObjectId instances __toString as a hex string of their ID. But you'll see the exact same error if you try to cast whatever your id value is into a string.

   I don't know if the bug has been reported yet, but you can check the 10gen JIRA tickets if you want. I'll try to find a workaround for Genghis, though, because unfortunately the PHP driver doesn't have the fastest bug fix turnaround at this point.

[bobthecow]

Here's where it all fails:

[bobthecow]

Okay. The null ID is fixed in de558c9 ... it'll go out in the next release :)

[bobthecow]

I fixed a couple more issues for when you use dumb IDs like null, these fixes will be in the next release as well :)

[jmikola]

@bobthecow: Thanks for pinging me on this. I created PHP-570 to track the issue.

[bobthecow]

@jmikola Thanks for reporting it via the proper channel :)