feature(collection): Add Collection.extendDomain()

[andreialecu]

Static function that allows adding values or functions to the domains of all collection instances.

Replaces #315

[andreialecu]

You have access to this.collection and this.domain from inside any extensions defined using this method.

Usage example:

app.js

var Collection = require('deployd/lib/resources/collection');
var deployd = require('deployd');

Collection.extendDomain("getColName", function(){
  return this.collection.name;
});

Collection.extendDomain("hasChanges", function(){
  var domain = this.domain;
  if (_.find(_.keys(domain.data), function(key) {
    return domain.changed(key);
  })) {
    return true;
  }
  return false;
});

// configure database etc.
var server = deployd({
    port: process.env.PORT || 1337,
    env: process.env.ENV || 'development',
    db: {
        connectionString: process.env.MONGO_URI
    }
});

// start the server
server.listen();

// debug
server.on('listening', function () {
    console.log("Server is listening on port: " + (process.env.PORT || 1337));
});

// Deployd requires this
server.on('error', function (err) {
    console.error(err);
    process.nextTick(function () { // Give the server a chance to return an error
        process.exit();
    });
});

You can then use those defined functions in your event scripts, example:

On POST

   emit(getColName() + ":post", this);

[ericfong]

WOW. Great Feature!!!
But seems need to wait for 592 being rebased first?

[andreialecu]

Yeah, it has a bit of dependency on #592. I can decouple if needed, but I also have another PR I need to send after these three which is related to AfterCommit as well.

So let's merge #592 first, that's easier.

[ericfong]

Thanks for your contribution!
Landed as 450b8ad