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POOrdering MongoDB query results in less rows returned
 

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    <p>I'm having an issue with ordering in Mongoid (2.0.0.beta.17 and 2.0.2)/MongoDB. Perhaps I'm just not experienced enough with MongoDB, and some of you can help me understand what I'm doing wrong? </p> <p>The user-level symptoms are: </p> <ul> <li>Queries not sorting correctly by date or ID </li> <li>User posts are not appearing when they seem like they should be (this is a Twitter-like <a href="http://www.plantworking.com" rel="nofollow">social networking site for gardeners</a>, and the most recent posts are sometimes not showing up) </li> </ul> <hr> <pre><code>irb(main):024:0&gt; Update.all.size </code></pre> <p>=> <strong>551</strong> </p> <pre><code>Update.ordered.size # (see below for definition) </code></pre> <p>=> <strong>490</strong> </p> <pre><code>irb(main):010:0&gt; Update.all.select{|u| u.created_at.nil?} </code></pre> <p>=> [] </p> <p>When I go into the mongo shell, and do: </p> <pre><code>var cursor = db.updates.find({}, {'_id': 1}).limit(600); while (cursor.hasNext()) printjson(cursor.next()); </code></pre> <p>I get <strong>454</strong> lines returned. </p> <pre><code>var cursor = db.updates.find({}, {'_id': 1}).sort({created_at : 1}).limit(600); while (cursor.hasNext()) printjson(cursor.next()); </code></pre> <p>Also returns <strong>454</strong> lines. </p> <pre><code>db.updates.find({}).sort({created_at: -1}).limit(1); </code></pre> <p>returns an update from February 23rd. But I have updates from yesterday in MongoDB. Any ideas? </p> <hr> <p>My model is: </p> <pre><code>class Update include Mongoid::Document include Mongoid::Timestamps include Paperclip field :body ... index [[ :created_at, Mongo::DESCENDING ]] ... named_scope :ordered, :order_by =&gt; ([[:created_at, :desc]]) ... end </code></pre>
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