Tutorial by Examples: u

Your upstart script will need to be modified to use multiple IP addresses of the replica set. start on started mountall stop on shutdown respawn respawn limit 99 5 script # our example assumes you're using a replica set and/or oplog integreation export MONGO_URL='mongodb://mongo-a...

The analog to the meteordump command is meteorrestore. You can do a partial import by selecting the specific collection to import. Particularly useful after running a drop command. # make sure your app is running meteor # then import your data mongorestore --port 3001 --db meteor /path/to/dump...

Preallocation. Mongo sets aside disk-space in empty containers, so when the time comes to write something to disk, it doesn't have to shuffle bits out of the way first. It does so by a doubling algorithm, always doubling the amount of disk space preallocated until it reaches 2GB; and then each preal...

Gotta rotate those log files, or they'll eventually eat up all of your disk space. Start with some research... mongodb-log-file-growth rotate-log-files Log files can be viewed with the following command... ls /var/log/mongodb/ But to set up log-file rotation, you'll need to do the following.....

db.posts.find().forEach(function(doc){ if(doc.commenters){ var firstCommenter = db.users.findOne({'_id': doc.commenters[0]._id }); db.clients.update({_id: doc._id}, {$set:{'firstPost': firstCommenter }}, false, true); var firstCommenter = db.users.findOne({'_id': do...

db.posts.find().forEach(function(doc){ if(!doc.foo){ db.posts.update({_id: doc._id}, {$set:{'foo':''}}, false, true); } });

db.posts.find().forEach(function(doc){ if(!doc.foo){ db.posts.update({_id: doc._id}, {$set:{'foo':'bar'}}, false, true); } });

db.posts.find().forEach(function(doc){ if(doc.foo === 'bar'){ db.posts.remove({_id: doc._id}); } });

db.posts.find().forEach(function(doc){ if(doc.foo === 'bar'){ db.posts.update({_id: doc._id}, {$set:{'foo':'squee'}}, false, true); } });

db.posts.find().forEach(function(doc){ if(doc.oldfield){ // the false, true at the end refers to $upsert, and $multi, respectively db.accounts.update({_id: doc._id}, {$unset: {'oldfield': "" }}, false, true); } });

var newvalue = ""; db.posts.find().forEach(function(doc){ if(doc.foo){ newvalue = '"' + doc.foo + '"'; db.accounts.update({_id: doc._id}, {$set: {'doc.foo': newvalue}}); } });

var newvalue = null; db.posts.find().forEach(function(doc){ if(doc.foo){ newvalue = '"' + doc.foo + '"'; db.accounts.update({_id: doc._id}, {$set: {'doc.foo': newvalue}}); } });

This project is a self-contained example done completely in the Interface Builder. You should be able to work through it in 10 minutes or less. Then you can apply the concepts you learned to your own project. Here I just use UIViews but they can represent whatever view you like (ie, button, label...

These functions are used to check Mouse Button Clicks. Input.GetMouseButton(int button); Input.GetMouseButtonDown(int button); Input.GetMouseButtonUp(int button); They all take the-same parameter. 0 = Left Mouse Click. 1 = Right Mouse Click. 2 = Middle Mouse Click. GetMouseButton i...

Purpose Use the CREATE SEQUENCE statement to create a sequence, which is a database object from which multiple users may generate unique integers. You can use sequences to automatically generate primary key values. When a sequence number is generated, the sequence is incremented, independent of th...

Backbone.js is made up of four separate components: Collections, Models, Routers, and Views. Each of these serve different purposes: Model - represents a single data object, but adds additional functionalities not provided by native JavaScript objects, such as an event system and a more conveni...

Using Dynamic Arrays in VBA can be quite clunky and time intensive over very large data sets. When storing simple data types in a dynamic array (Strings, Numbers, Booleans etc.), one can avoid the ReDim Preserve statements required of dynamic arrays in VBA by using the Split() function with some cl...

Now that the OCaml distribution is available on your favorite operating system, we can create your first program in OCaml: the Hello World! We have different ways to launch an OCaml program. The REPL (toplevel) You can execute your code interactively with the toplevel. With the OCaml toplevel, yo...

Use $state.transitionTo to go form one state to another. This is a low level method to transition and $state.go is the recommended way for most common use cases as it uses this method internally. $state.transitionTo(toState [, toParams] [, options]) toState - the state to transition to toPara...

Webhook Overview A WebHook is an HTTP callback: an HTTP POST that occurs when something happens; a simple event-notification via HTTP POST. A web application implementing WebHooks will POST a message to a URL when certain things happen. PubNub Presence Pubnub presence all about the user prese...