HACKABILITY

This post is a cheat sheet for MongoDB. This cheat sheet is not technical, maybe you can use this when you cooking.# Find all data in collectionUsage:db.collection.find({})# Find if it has specific keySyntax: $exists{: {$exists: }}Usage:db.collection.find({"field": {"$exists": true}})Reference:http://docs.mongodb.org/manual/reference/operator/query/exists/# Delete Key ( $unset )S..