我对Mongo和PHP相当陌生。我对相对简单的东西一直很好,但是我遇到了一个在有限数量的_id's有限的mongo集合中执行php查找的障碍。
这里的演练......
// "characters" collection
{ "_id":{"$id":"3f177b70df1e69fe5c000001"}, "firstname":"Bugs", "lastname":"Bunny" }
{ "_id":{"$id":"3f2872eb43ca8d4704000002"}, "firstname":"Elmer", "lastname":"Fudd" }
{ "_id":{"$id":"3f287bb543ca8de106000003"}, "firstname":"Daffy", "lastname":"Duck" }
// "items" collection
{ "_id":{"$id":"4f177b70df1e69fe5c000001"}, "mdl":"carrot", "mfg":"Wild Hare Farms ltd.", "ownerid":{"$id":"3f177b70df1e69fe5c000001"} }
{ "_id":{"$id":"4f2872eb43ca8d4704000002"}, "mdl":"hat", "mfg":"Acme Inc.", "ownerid":{"$id":"3f2872eb43ca8d4704000002"} }
{ "_id":{"$id":"4f287bb543ca8de106000003"}, "mdl":"spaceship", "mfg":"Acme Inc.", "ownerid":{"$id":"3f287bb543ca8de106000003"} }
// Let's say I do a find on the item collection for a specific manufacturer...
$itemOwners = $db->items->find(array("mfg" => "Acme Inc."), array("ownerid"));
// The result looks something like this...
[
"4f2872eb43ca8d4704000002":{"_id":{"$id":"4f2872eb43ca8d4704000002"},"ownerid":{"$id":"3f2872eb43ca8d4704000002"}},
"4f287bb543ca8de106000003":{"_id":{"$id":"4f287bb543ca8de106000003"},"ownerid":{"$id":"3f287bb543ca8de106000003"}}
]
// I'd now like to perform a find on the character collection and get the corresponding owner documents.
// To do that I need to build the $in array from the previous find results...
foreach ($itemOwners as $doc)
$itemOwnersTemp[] = $doc["ownerid"];
$itemOwners = $itemOwnersTemp;
// The resulting array looks like this. I've read that the ids need to be in MongoId format. Seems like they are?
[
{"$id":"3f2872eb43ca8d4704000002"},
{"$id":"3f287bb543ca8de106000003"}
]
// and (finally) the conditional find. The result set is always empty. What am I tripping up on?
$characterDocs = $db->characters->find(array("_id" => array('$in' => $itemOwners));
谢谢Derick ...你的代码帮助我找到我的问题。这不是MongoId或PHP。在最后发现的叹息中,这是一个集合名称中的微不足道的错字。 – 2012-02-08 18:25:33