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    <p>Objects in your <code>writing</code> array is treated as <a href="http://mongoosejs.com/docs/subdocs.html" rel="nofollow">sub/embedded-documents</a>. This means that they are assigned an <code>_id</code> when they are stored in the database.</p> <p>So, there is a few ways you can query <code>Blog</code>s based on these sub documents:</p> <pre><code>var ObjectId = mongoose.Types.ObjectId; // Assuming these objects are in the 'writing' array of a Blog var postObject = { post: 'some text', name: 10 }, postObjectWithId = { _id: new ObjectId(), post: 'some text', name: 10 }; // Example #1 Works! Blog.find({'writing.post': postObject.post}) .exec(function(err, res){ onBlogResult("Ex#1", err, res) }); // Example #2 Works! Blog.find({}) .where('writing').in([postObjectWithId]) .exec(function(err, res){ onBlogResult("Ex#2", err, res) }); // Example #3 Works - its the same as example #2! Blog.find({'writing': { $in: [ postObjectWithId ]}}) .exec(function(err, res){ onBlogResult("Ex#3", err, res) }); // Example #4 Fails because of missing _id on postObject! Blog.find({'writing': { $in: [ postObject ]}}) .exec(function(err, res){ onBlogResult("Ex#4", err, res) }); </code></pre> <p>As you see, you can only <code>find</code> objects with an array containing an element using <code>in</code> if you have the full object (including the <code>_id</code>).</p> <p>You can view the whole source on this <a href="https://gist.github.com/jmyrland/5578516" rel="nofollow"><strong>GIST</strong></a> - Test it out for yourself :)</p> <p>Hope this helps :)</p> <p><a href="http://mongoosejs.com/docs/queries.html" rel="nofollow"><strong>Read the mongoose docs here</strong></a>.</p>
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    1. COWhat goes in "postObj"? I tried 'post' but that doesn't work - closer but something is off. I'm getting confused by the chaining. (Yeh, I typed the schema wrong when making the example.)
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    2. COpostObj example `{ post: "heyho", name: 1 }` - as your schema specifies. I think that works.
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    3. COHmmm. Still not working. The find() works, but I can't penetrate deeper into the structure using mongoose. I'll keeping trying, though I've tried a dozen version. I CAN pull out what I need by explicitly writing out in the exec function this: `var just_the_post = result[0]['writing'][0]['post']` ;D
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