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    <p>Well, according to <a href="https://stackoverflow.com/questions/13206015/meteor-upsert-equivalent">this answer</a> Meteor $upsert flag is still in enhancement list and seems to be added in stable branch after 1.0 release.</p> <p>So the first way is how it was said to add an unique index:</p> <p>All the implementation ways are <a href="https://stackoverflow.com/questions/10167604/how-can-i-add-a-two-column-unique-id-to-the-mongodb-in-a-meteor-app">listed here</a>. I would recommend you to use native mongo indexes, not a code implementation. </p> <p>The optimistic concurrency way is much more complicated according to no transactions in MongoDB.</p> <p>Here comes my implementation of it(be careful, might be buggy))):</p> <pre><code>var result_callback = function(_id) { // callback to call on successfull insert made } var $set = {stage_id: xxxx, entrant_id: xxxx}; var created_at = Date.now().toFixed(); var $insert = _.extend({}, $set, {created_at: created_at}); Scores.insert($insert, function(error, _id) { if (error) { //handle it return; } var entries = Scores.find($set, {sort: {created_at: -1}}).fetch() if (entries.length &gt; 1) { var duplicates = entries.splice(0, entries.length - 1); var duplicate_ids = _.map(duplicates, function(entry) { return entry._id; }); Scores.remove({_id: {$in: duplicate_ids}}) Scores.update(entries[0]._id, $set, function(error) { if (error) { // handle it } else { result_callback(entries[0]._id) } }) } else { result_callback(_id); } }); </code></pre> <p>Hope this will give you some good ideas)</p> <p><em>Sorry, previous version of my answer was completely incorrect.</em></p>
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    1. COThose linked questions are helpful. I was mainly thinking about what the clients will see. I am now leaning towards pre-creating all the Scores for a Stage, when a user flags the stage as 'open'. This solves not only the above, but also avoids reactive churn listing items not in another collection.
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    2. COPre-creation would be the best solution here I guess. Much simpler. Much more transparent.
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