如何在mongodb的字段中找到多个项目？

Question

I have the following type of occurrence in my Mongo documents.

"tags" : [ [ "narnia" ], [ "aslan" ], [ "winter" ], [ "heaven" ] ]

I need to know how to find this document by matching all of any number of the tags. Ie Narnia AND Aslan (but not Narnia OR Aslan).

The query needs to be made with in PHP.

So far I only have it working for a single tag. Ie

$filter['tags'] = array('$in' => array(array('Narnia')));

Answer 1

As Hussain mentioned in comments - you might want to revise that document structure as seems like you're storing unnecessary arrays.

Otherwise, what you're trying to do could be done with an $and statement (example without the nested arrays):

PRIMARY> db.wardrobe.find({ $and: [ { tags: "narnia" }, { tags: "tugboat" } ] })
//returns nothing

PRIMARY> db.wardrobe.find({ $and: [ { tags: "narnia" }, { tags: "winter" } ] })
//returns { "_id" : ObjectId("521067a48202463b88c2a0c9"), "tags" : [ "narnia", "aslan", "winter", "heaven" ] }

In PHP:

//With your nested arrays:
$filter = array(
   '$and' => array( 
      array('tags' => array('narnia') ), 
      array('tags' => array('aslan') )
   )
);

//With a simple array:
$filter = array(
   '$and' => array( 
      array('tags' => 'narnia'), 
      array('tags' => 'aslan')
   )
);

$mongoClient->selectCollection('cwlewis', 'wardrobe')->find( $filter );