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POMongoDB nested array query
 

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    <p>I've asked this as a comment on <a href="https://stackoverflow.com/questions/5250652/query-a-nested-array-in-mongodb" title="another">another</a> question, and also posted a <a href="https://groups.google.com/forum/#!searchin/mongodb-user/advertised/mongodb-user/SetYxmdvjTE/NiKGhu6cCKsJ" rel="noreferrer" title="question">question</a> on mongodb-user. No responses so far, so I'm resorting to asking a separate question. </p> <p>The <a href="http://docs.mongodb.org/manual/reference/operator/in/#op._S_in" rel="noreferrer" title="documentation">documentation</a> states:</p> <blockquote> <p>If the field holds an array, then the $in operator selects the documents whose field holds an array that contains at least one element that matches a value in the specified array (e.g. , , etc.)</p> </blockquote> <p>I'm using:</p> <pre><code>mongod --version: db version v2.2.2, pdfile version 4.5 Thu May 30 12:19:12 git version: d1b43b61a5308c4ad0679d34b262c5af9d664267 mongo --version: MongoDB shell version: 2.0.4 </code></pre> <p>In MongoDB shell:</p> <pre><code>db.nested.insert({'level1': {'level2': [['item00', 'item01'], ['item10', 'item11']]}}) </code></pre> <p>Here's a list of queries that should work according to the documentation, and the results they produce:</p> <p>Why doesn't this work?</p> <pre><code>&gt; db.nested.findOne({'level1.level2.0': 'item00'}) null </code></pre> <p>Why do I need the $all?</p> <pre><code>&gt; db.nested.findOne({'level1.level2.0': {'$all': ['item00']}}) { "_id" : ObjectId("51a7a4c0909dfd8872f52ed7"), "level1" : { "level2" : [ [ "item00", "item01" ], [ "item10", "item11" ] ] } } </code></pre> <p>At least one of the following should work, right?</p> <pre><code>&gt; db.nested.findOne({'level1.level2.0': {'$in': ['item00']}}) null &gt; db.nested.findOne({'level1.level2': {'$in': ['item00']}}) null </code></pre> <p>Any ideas? We're considering abandoning MongoDB if the query syntax doesn't work as advertised.</p> <p>Thanks!</p>
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