1. MongoDB 2.6, Mongoose 4.0, and
Beyond
NodeJS and MongoDB meets ES6 and Browserify
Valeri Karpov
Software Engineer, MongoDB
www.thecodebarbarian.com
www.slideshare.net/vkarpov15
github.com/vkarpov15
@code_barbarian

2. *
Who Am I?
•CI/NodeJS Engineer at MongoDB
•Maintainer of mongoose ODM
•Former CTO, LevelUp
•MEAN stack apps: Ascot Project, Bookalokal

3. *
Talk Overview
•Exciting developments in JavaScript:
• ECMAScript 6 (Harmony) is coming
• Browserify is changing the way we use NodeJS
• Compiles NodeJS code into browser-friendly form
•Mongoose 4.0 (ETA September) + ES6 + Browserify
•Also highlight some new features in MongoDB 2.6

4. *
What is Mongoose?
•Elegant ODM for MongoDB and NodeJS
•ActiveRecord-like Models per MongoDB collection
•Syntactic sugar for queries: chaining, fluent syntax
• ex: .find().where('answer').equals(42)
•Join-like functionality via populate()
•Promises/A+ conformant promises
•Community authored (same author as socket.io)

5. *
Part I: ES6 Generators and mongoose

6. *
Generators in ECMAScript 6
•ES6 will include a yield keyword
•Write async code with less pyramid of doom
•NodeJS 0.11.x, use node --harmony

7. *
Using Generators in ECMAScript 6
•Still need library, such as Q or co
•Special syntax for a function that can yield:
• function*() {}

8. *
Attaining Harmony with Generators
•yield enables try/catch for async code
•Elegant replacement for async.parallel()

9. *
Using yield with mongoose
•MongoDB 2.6 text search (mongoose >= 3.8.9)

10. *
Batch save in mongoose
•Without yield:

11. *
Batch save in mongoose with yield

12. *
Part II: Mongoose in the Browser

13. *
Browserify-friendly Schemas
•The dream: same schema in browser and server
•Simplicity: one schema, one language, one
validation function

14. *
The Dream Made Real

15. *
The Dream Made Real, Part II

16. *
From Humble Beginnings

17. *
Browserify Schema Status
•Very very rough proof of concept, not alpha-ready
•Branch on Github
•Also supports ES6 generators :)

18. *
Review
•JavaScript has a very exciting future
•ES6 Generators make async code human-readable
•Browserify makes code sharing a reality
•Mongoose will take advantage of this tech
•My talk at 11:45: 1 hour to build a MEAN stack app
with mongoose and browserify

19. *
Thanks for Listening!
•Slides on:
• Twitter: @code_barbarian
• Slideshare: slideshare.net/vkarpov15
•Mongoose on Github