title: How to push list of object ids from another query into an array attribute of a document in MongoDB?
body: <p>What I need is something like:</p>
  
  <pre><code>db.categories.update(
                  { _id: ObjectId("52824e116a4dec0000000004") },
                  { $push: { scores: { $each : db.products.find({"category": ObjectId("51cedfb29b33fc0800000015")})} }
                )
  </code></pre>
  
  <p>Do I need ORM tool for this? Or can I do with shell?</p>