A short introduction to MongoDB and the Ruby driver for MongoDB.

1. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 1
MongoDB & Ruby in 10 Minutes
Tobias.Trelle@codecentric.de @tobiastrelle

2. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 2
Tobias Trelle
- Senior IT Consultant @
codecentric AG (Düsseldorf)
- Organizer of MongoDB
User Group Düsseldorf
- Authoring a MongoDB book
(dpunkt-Verlag)

3. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 3
MongoDB
NoSQL data store / Open Source
Single records are called documents
Replication & Sharding out-of-the-box
Map/Reduce
Geospatial Indexes / Queries

4. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 4
MongoDB Overview
Server
Database
Collection
Document
Field
Tabelle
Zeile
Spalte
Relationales
Pendant Aber …
Flexibles
Schema
- Arrays
- Rekursiv

5. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 5
Documents
Ordered set of key/values pairs
Values can be an array, document or simple type
Max size = 16 MB
Logical namespaces for documents are called collections
Schemaless
Format: BSON = Binary JSON != JSON

6. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 6
Documents
{}
{ hello: "MongoDB" }
{ foo:
{ bar: "baz"},
a: [1,2,3,5,8]
}

7. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 7
MongoDB Gems
$ gem install mongo
Fetching: bson-1.9.0.gem (100%)
Fetching: mongo-1.9.0.gem (100%)
Successfully installed bson-1.9.0
Successfully installed mongo-1.9.0
2 gems installed
...

8. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 8
MongoDB Gems
$ gem install bson_ext
Fetching: bson_ext-1.9.0.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a
while...
Successfully installed bson_ext-1.9.0
1 gem installed...

9. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 9
Ruby Driver API

10. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 10
Ruby Driver
irb(main):001:0> require 'mongo'
=> true
irb(main):002:0> include Mongo
=> Object
irb(main):003:0> client = MongoClient.new
...
irb(main):004:0> db = client["test"]
...
irb(main):005:0> coll = db["foo"]

11. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 11
Ruby Driver
irb(main):006:0> coll.remove
=> {"n"=>3, "connectionId"=>2, "err"=>nil, "ok"=>1.0}
irb(main):007:0> coll.insert :hello => "MongoDB"
=> BSON::ObjectId('51d1100ec9f0b10b78000001')
irb(main):008:0> doc = coll.find_one
=>
{"_id"=>BSON::ObjectId('51d1100ec9f0b10b78000001'),
"hello"=>"MongoDB"}

12. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 12
Ruby Driver
irb(main):013:0> coll.insert :a => 1, b: [1,2,3,4,5]
=> BSON::ObjectId('51d1108ac9f0b10b78000002')
irb(main):014:0> crsr = coll.find
=> <Mongo::Cursor:0x158e2a8 namespace='test.foo'
@selector={} @cursor_id=>
irb(main):016:0> crsr.each{ |doc| puts doc }
{"_id"=>BSON::ObjectId('51d1100ec9f0b10b78000001'),
"hello"=>"MongoDB"}
{"_id"=>BSON::ObjectId('51d1108ac9f0b10b78000002'),
"a"=>1, "b"=>[1, 2, 3, 4, 5]}

13. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 13
Persistence Frameworks
Mongoid
http://mongoid.org/
MongoMapper
http://mongomapper.com/

14. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 14
MongoDB User Group Düsseldorf
https://www.xing.com/net/mongodb-dus
@MongoDUS
Meetup #7: Schema Design w/ MongoDB
18.07.2013 19:00
https://www.xing.com/events/7-treffen-schema-
design-mongodb-1268228
MUG Düsseldorf

15. codecentric AG / Tobias Trelle / MongoDB & Ruby in 10 Minutes 15
QUESTIONS?
Tobias Trelle
codecentric AG
Merscheider Str. 1
42699 Solingen
tel +49 (0) 212.233628.47
fax +49 (0) 212.233628.79
mail Tobias.Trelle@codecentric.de
twitter @tobiastrelle
www.codecentric.de
blog.codecentric.de/en/author/tobias-trelle
www.xing.com/net/mongodb-dus