Intro to @PyGotham Aug 15-16

by @ewenchristie

3 Part Discussion

1. Introduction to2. Patterns in development3. Meteor + Python

What is ?

● 100% Pure Javascript Full Stack● Open Source● Web and Mobile Apps Dev Platform● Focus on apps, Not infrastructure● www.meteor.com

Who backs ?

● Meteor Development Group○ Active development by full time employees

● $20 Million series B - May 2015● Revenue Product: Galaxy (official host)● Meteor platform is opensource (MIT license)

○ You own the code; Host anywhere

The Basics

● Javascript (ES2015)● MongoDB: Node.js

○ https://university.mongodb.com/○ Schema-less Design

● HTML, CSS○ Bootstrap

● Git/GitHub● Node.JS (e.g., asynchronous, callbacks)

Code DEMO● curl https://install.meteor.com/ | sh● meteor create --example todos● cd todos● meteor● meteor mongo● meteor deploy PyGotham2015.meteor.com

Another example:

● meteor create --example localmarket

Architecture

Database Schema Design

Just build App → Let schema evolve

When to Denormalize○ 1 : 1 → embed○ 1 : few → embed○ many : many → link

Reactive Patterns using observeChanges

Meteor.startup(function() {observeChanges

})== OR ==

observeChanges in the top level code.

Example: publish / subscribe// SERVER

Meteor.publish("counts-by-room", function (roomId) {

var handle = Messages.find({roomId: roomId}).observeChanges({ added: function (_id) {

// Do something }, changed: function (_id) {

// Do something } });

})

// CLIENTTracker.autorun(function () {

Meteor.subscribe("counts-by-room", Session.get("roomId"));});

Observe and ObserveChanges

Function parametersmyCollection.find({}).observeChanges({

added: function(id, fields) {//Do something

}});

id = _id in the MongoDBfields → Changed fields only

AtmosphereJS.com

How to use packages

● meteor search <search-terms>● meteor add <package-name>● meteor list● gitHub

○ README.md

Search Patterns

● Search (Google, Yahoo!, Bing)● Find command (CTRL + f)

Page levelDirectory

● grep commandEx: “grep -R signIn --exclude-dir="\.meteor*”

Playgrounds

● Experiment queries on the command line○ meteor mongo

● Create small experiment applications○ meteor create myExperiment

CRUD

● Create● Read● Update● Delete

Production Servers

● yourApp.meteor.com● Digital Ocean● Modulus● Heroku● Galaxy (coming soon)

Meteor + Python

● https://pypi.python.org/pypi/python-meteor● http://meteorpedia.

com/read/DDP_Clients#Python● https://www.youtube.com/watch?

v=zzphV5C_20E

● pip install python-meteor

Challenges

● Unlearning ○ Relational vs. NoSQL○ Iterative vs. Reactive

● Documentation (need more official docs)● Scaling (similar to other platforms)● Keeping up with active changes● Accessibility to online information

Why Javascript?

Geoff Schmidt: Javascript State of the Union

Why learn a new platform?

● Learn a new programming language every year

● Opportunity to learn different points of view○ Examples such as Pythonic approaches○ LearnYouNode○ Security (Why Meteor doesn’t use cookies?)

What’s next?

● Meteor 1.2 (Summer 2015)● Galaxy (production meteor deploy)● REST, microservices, ES2015 modules, +● Reactive Database support for Redis & SQL ● Vote on Meteor’s Roadmap

○ https://trello.com/b/hjBDflxp/meteor-roadmap● Meteor-NY Meetup

Resources

AtmosphereJS.comGitHubATOM.iohttp://js2.coffee/https://www.meteor.com/tools/resourceshttps://github.com/awatson1978/meteor-cookbook

THANKS!