Realtime Web Apps

with 

Horizon + RethinkDB

by Zak Burki

16th Jun 2016

Horizon + RethinkDB

• What is RethinkDB?
• What's this Horizon?
• Why Use any of it?

RethinkDB

• RethinkDB is an opensource NOSQL Database (like MongoDB)
• Documents Store (Objects)
• Built using C++ for speed 
• High Availability and Distributed
• Designed to push changes into the queries for real-time updates (instead of traditional polling)
• Supports Table Joins (SQL style)!

RethinkDB

Official Drivers Available for :

1. JavaScript
2. Ruby
3. Python
4. Java

Unofficial Drivers Available for many other Programming Languages. (Go, PHP, C#, Haskell, Clojure, Elixir etc.)

ReQL

SQL:

ReQL:

r.table("posts")
  .filter(function (post) {
    return r.table("users")
      .filter(function (user) {
        return user("id").eq(post("authorId"))
      }).count().gt(0)
    })

SELECT * FROM users
WHERE
SELECT *
  FROM posts
  WHERE EXISTS
    (SELECT * FROM users
     WHERE posts.author_id
         = users.id)

What is Horizon?

Ok - I lied.

Sample

      hz("airlines").fetch().subscribe(
          result => console.log('Result:', result),
          (err) => console.log(err),
          () => {
            console.log('Results fetched')
          }
        );

      horizon.onReady().subscribe(() => console.log("Connected to Horizon server"))

      horizon.onDisconnected().subscribe(() => console.log("Disconnected from Horizon server"))

      horizon.connect();

Horizon Pros

• Built in social authentication

• Scales better than Meteor

• Is Free to Use (unlike Firebase)

• Extendible using most languages when you need more complex business logic.

Horizon Cons

To be continued...

Any Questions?

twitter: @zakburki