How to find a document by embedded item in MongoDB PHP

Question

I have the next document in MongoDB:

Contest document:

{
 "_id": ObjectId("502aa915f50138d76d11112f7"),
 "contestname": "Contest1",  
 "description": "java programming contest", 
 "numteams": NumberInt(2),
 "teams": [
   {
    "teamname": "superstars",
    "userid1": "50247314f501384b011019bc",
    "userid2": "50293cf9f50138446411001c",
    "userid3": "50293cdff501384464110018"
   },

   {
    "teamname": "faculty",
    "userid1": "50247314f501384b0110100c",
    "userid2": "50293cf9f50138446410001b",
    "userid3": "50293cdff501384464000019"
   }
 ],
 "term": "Fall 2012"
}

Imagine that I have more than this document where users can register. I want to find all the contest that a user has registered. I have something like this so far:

$id = "50247314f501384b011019bc";
$user = array('userid1' => $id, 'userid2' => $id, 'userid3' => $id );
$team = array('teams' => $user);            
$result =$this->collection->find($team);
return $result;

Could somebody help me with that?

Thank you.

------Solved------

$team = array('$or' => array(array('teams.userid1' => $id),
               array('teams.userid2' => $id), 
               array('teams.userid3' => $id)
                 ));            

$result =$this->collection->find($team);

Stennie · Accepted Answer · 2012-08-15 21:22:09Z

3

Your data structure is awkward to query because you have an array of embedded documents. With a slight change to the data you could make this easier to work with.

I've put the user IDs into an array:

{
 "contestname": "Contest1",  
 "description": "java programming contest", 
 "numteams": 2,
 "teams": [
   {
    "teamname": "superstars",
    "members": [
        "50247314f501384b011019bc",
        "50293cf9f50138446411001c",
        "50293cdff501384464110018"
    ]
   },

   {
    "teamname": "faculty",
    "members": [
        "50247314f501384b0110100c",
        "50293cf9f50138446410001b",
        "50293cdff501384464000019"
    ]
   }
 ],
 "term": "Fall 2012"
}

You could then do the PHP equivalent find() for:

db.contest.find(
        {'teams.members':'50247314f501384b011019bc'},
        {'contestname':1, 'description':1}
    )

Which would return the matching contests this user had entered:

{
    "_id" : ObjectId("502c108dcbfbffa8b2ead5d2"),
    "contestname" : "Contest1",
    "description" : "java programming contest"
}
{
    "_id" : ObjectId("502c10a1cbfbffa8b2ead5d4"),
    "contestname" : "Contest3",
    "description" : "Grovy programming contest"
}

answered Aug 15, 2012 at 21:22

Stennie

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2 Comments

user1163043 Over a year ago

Thank you. I solved it with my current structure. Your dot notation was useful though.

Stennie Over a year ago

@antoniomtz: Glad you found a solution! A potential issue with your current schema is that you will need to list all the fields in your $or .. so this may be inconvenient/inefficient unless you have a limited number of members per team. If you can rework that into an array you could take advantage of indexes as well.

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