Using MongoDB::command to query

Question

I'm reading MongoDB::command docs, but they see quite poor to me. How can I use ::command to query a collection?

Lets say I have a collection of things and each thing has a path (an alpha-numerical string of IDs of other things joined with /). How would I query all the things that starts with /2e3r4t/?

Maybe

::command(["path" => "/^/2e3r4t//"])

?

Sylvain Leroux · Accepted Answer · 2015-05-10 11:48:48Z

1

MongoDB::command is used to send raw database commands to the server. For most common commands, you will find a wrapper in your language library.

Here, given your description, you need Collection::find instead. something like that (untested -- beware of typos):

$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'thing');

$regex = new MongoRegex("/^\/2e3r4t\//");
$collection->find(array('path' => $regex));

Amusingly enough, as of MongoDB 3.0.2, the find command is not documented, and apparently is not yet implemented as a DB command:

> db.runCommand({find: "w"})
{ "ok" : 0, "errmsg" : "find command not yet implemented" }

So, for this one, you will have to rely on the corresponding method of your driver.

EDIT: from a quick look at the sources, the find command was implemented between 3.1.0 and 3.1.1:

https://github.com/mongodb/mongo/commit/4049c8328c98d8eb2b84fffca43ff4904e936909

edited May 10, 2015 at 11:48

answered May 10, 2015 at 11:03

Sylvain Leroux

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1 Comment

Sylvain Leroux Over a year ago

@alexandernst As of 3.0.2 this is not yet supported.

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