habitica-self-host/migrations/20140220_challenge_memberCount.js

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db.challenges.find({},{members:1}).forEach(function(chal){
  db.challenges.update({_id:chal._id}, {$set:{memberCount:chal.members.length}});
});
perf(challenges): use some query & elemMatch magic on memberCount to reduce challenges.list overhead. memberCount is now updated when leaving/joining challenges 2014-02-20 18:37:55 +00:00			`db.challenges.find({},{members:1}).forEach(function(chal){`
			`db.challenges.update({_id:chal._id}, {$set:{memberCount:chal.members.length}});`
			`});`