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    <p>This is the expected behavior, though it is a little subtle, and not guaranteed (just an implementation detail).</p> <p>The callback to observe fires immediately when the command is inserted into <code>CommandQueue</code>. So the insert to <code>OtherCollection</code> happens while the <code>CommandQueue.insert</code> method is running, as part of the same call stack. This means the <code>OtherCollection</code> insert is considered part of the local 'simulation' of the <code>CommandQueue</code> insert, and is not sent to the server. The server runs the <code>CommandQueue</code> insert and sends the result back, at which point the client discards the results of the simulation and applies the results sent from the server, making the <code>OtherCollection</code> change disappear.</p> <p>A better way to do this would be to write a custom method. Something like:</p> <pre><code>Meteor.methods({ auditedCommand: function (command) { CommandQueue.insert(command); var whatever = someProcessing(command) OtherCollection.insert(whatever); } }); </code></pre> <p>Then:</p> <pre><code>Meteor.call('auditedCommand', command); </code></pre> <p>This will show up immediately on the client (latency compensation) and is more secure as clients can't insert to <code>CommandQueue</code> without also adding to <code>OtherCollection</code>.</p> <p><strong>EDIT</strong>: this will probably change. The added callback shouldn't really be considered part of the local simulation of CommandQueue.insert. Thats just the way it works now. That said, a custom method is probably still a better approach for this, it will work even if other people add commands to the command queue, and is more secure.</p>
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    1. POWhy does meteor undo changes to collections nested in an observer method?
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    1. COgreat answer :-)
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    2. COThis solution worked fine as long as I had the 'insecure' package in my project. Removing it throws 'insert failed: Access denied' in OtherCollection.insert() on the client side. I obviously need the simulation to get good response time. But I can't give the client write access to OtherCollection as changes must be routed through audited transactions. Any idea how I could temporarily simulate the change in this case until the "real" change comes back from the server?
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