MongoDB & Mongomapper 4 real

4 real railswaycon 2010, berlin. jan krutisch <jan.krutisch@mindmatters.de> http://jan.krutisch.de/ Montag, 31. Mai 2010

http://www.cashbits.de/ Montag, 31. Mai 2010

mongodb you say? Montag, 31. Mai 2010

document database Montag, 31. Mai 2010

NoS QL inclu ded! document database Montag, 31. Mai 2010

no ﬁxed schema no migrations Montag, 31. Mai 2010

rich data structure Montag, 31. Mai 2010

id title descr pos_lat pos_lng Montag, 31. Mai 2010

{ "_id" : ObjectId("4c00245062610475a005afcd"), "address" : "Bernstorffstr. 174n22767 HamburgnDE", "description" : null, "position" : { "lat" : 53.5600912, "lng" : 9.9596977 }, "tags" : [ "hausarzt", "naturheilverfahren", "akupunktur", "allgemeinmedizin" ], "title" : "Dr. med. Lilo Eisenbarth", "loxicon_id" : 808261 } Montag, 31. Mai 2010

Montag, 31. Mai 2010

Montag, 31. Mai 2010 ✗

BSON ‣ Binary serialized JSON ‣ http://bsonspec.org/ ‣ Goals: Lightweight, Traversable, Efﬁcient ‣ Format for Datastorage and Wire Montag, 31. Mai 2010

rich queries Montag, 31. Mai 2010

Queries ‣ expressed BSON query documents ‣ very ﬂexible ‣ relatively simple query expressions ‣ pretty close to SQL conceptually ‣ examples will follow ‣ on top: map/reduce for aggregation Montag, 31. Mai 2010

Scaling ‣ Master > Slave replication ‣ Replica Pairs (with Arbiter) ‣ Replica Sets (Target: 1.6) ‣ Autosharding (Target: 1.6) Montag, 31. Mai 2010

A few words on durability ‣ MongoDB only fsyncs every <n> seconds ‣ There‘s a desaster waiting to happen! ‣ When in production, replicate! ‣ This is not as bad as it sounds. Montag, 31. Mai 2010

Installation/Hosting Montag, 31. Mai 2010

OS X: $ brew install mongodb Montag, 31. Mai 2010

Ubuntu/Debian: theres an apt for that Montag, 31. Mai 2010

excu se the p Ubuntu/Debian: un theres an apt for that Montag, 31. Mai 2010

http://www.mongodb.org/display/DOCS/Downloads Montag, 31. Mai 2010

also Montag, 31. Mai 2010

http://mongohq.com/ Montag, 31. Mai 2010

http://mongomachine.com/ Montag, 31. Mai 2010

basic usage Montag, 31. Mai 2010

$ mongo Montag, 31. Mai 2010

> use test switched to db test db.quotes.save({ text: "You can observe a lot just by watching.", from: "Yogi Berra", created_at: new Date() }); db.quotes.save({ text: "Silence is one of the hardest arguments to refute.", from: "Josh Billings", created_at: new Date() }); Montag, 31. Mai 2010

let‘s query Montag, 31. Mai 2010

db.quotes.find(); // returns all records in collection. db.quotes.find({from: "Yogi Berra"}); { "_id" : ObjectId("4c0022551496fc2051e93695"), "text" : "You can observe a lot just by watching.", "from" : "Yogi Berra", "created_at" : "Fri May 28 2010 22:06:45 GMT+0200 (CEST)" } Montag, 31. Mai 2010

$lt < $gt > $lte <= $gte >= $ne != Montag, 31. Mai 2010

db.quotes.find({from: {"$ne": "Yogi Berra"}}); { "_id" : ObjectId("4c0022551496fc2051e93696"), "text" : "Silence is one of the hardest arguments to refute.", "from" : "Josh Billings", "created_at" : "Fri May 28 2010 22:06:45 GMT+0200 (CEST)" } Montag, 31. Mai 2010

$in IN (2,3,4) $nin NOT IN $all [2,3] ~ [1,2,3] Montag, 31. Mai 2010

db.quotes.find({from:{ "$in":["Yogi Berra","Josh Billings"]}}); { "_id" : ObjectId("4c0022551496fc2051e93695"), "text" : "You can..."...} { "_id" : ObjectId("4c0022551496fc2051e93696"), "text" : "Silence..."...} db.arrays.save({list: [1,2,3]}); db.arrays.save({list: [4,5,6]}); db.arrays.save({list: [3,4,5]}); db.arrays.find({list:{ "$in":[3,4]}}); { "_id" : ObjectId("4c0025461496fc2051e93697"), "list" : [ 1, 2, 3 ] } { "_id" : ObjectId("4c0025501496fc2051e93698"), "list" : [ 4, 5, 6 ] } { "_id" : ObjectId("4c0025591496fc2051e93699"), "list" : [ 3, 4, 5 ] } db.arrays.find({list:{ "$all":[3,5]}}); { "_id" : ObjectId("4c0025591496fc2051e93699"), "list" : [ 3, 4, 5 ] } Montag, 31. Mai 2010

$mod yah, RLY $size okay $exists NOT NULL $type huh? Montag, 31. Mai 2010

db.arrays.find({list:{ "$mod":[4,0]}}); { "_id" : ObjectId("4c0025501496fc2051e93698"), "list" : [ 4, 5, 6 ] } { "_id" : ObjectId("4c0025591496fc2051e93699"), "list" : [ 3, 4, 5 ] } db.arrays.find({list:{ "$size":3}}); { "_id" : ObjectId("4c0025461496fc2051e93697"), "list" : [ 1, 2, 3 ] } { "_id" : ObjectId("4c0025501496fc2051e93698"), "list" : [ 4, 5, 6 ] } { "_id" : ObjectId("4c0025591496fc2051e93699"), "list" : [ 3, 4, 5 ] } db.arrays.find({list: {"$exists": true}}); [...] db.arrays.find({list: {"$type": 1}}); [...] Montag, 31. Mai 2010

...and... Montag, 31. Mai 2010

db.quotes.find({from: /^Yog/}); [...] db.quotes.find({from: /^Yog/}); [...] db.quotes.find("this.from == 'Yogi Berra'"); [...] db.quotes.find({"$where": "this.from == 'Yogi Berra'"}); [...] Montag, 31. Mai 2010

sort() Montag, 31. Mai 2010

db.quotes.find().sort({from:1}) {"from" : "Josh Billings" ... } {"from" : "Yogi Berra" ...} db.quotes.find().sort({from:-1}) {"from" : "Yogi Berra" ...} {"from" : "Josh Billings" ... } Montag, 31. Mai 2010

limit() Montag, 31. Mai 2010

skip() // == OFFSET Montag, 31. Mai 2010

count() Montag, 31. Mai 2010

db.quotes.find().count(); 2 Montag, 31. Mai 2010

Indices Montag, 31. Mai 2010

Indexing ‣ Same concept as SQL-Indices ‣ You want them. (Same concept as with...) ‣ Sort order, unique, compound, geospatial Montag, 31. Mai 2010

db.quotes.ensureIndex({from: 1}); db.quotes.ensureIndex({from: -1}); db.quotes.ensureIndex({text: 1}, {unique: true}); db.quotes.ensureIndex({from: 1, text: 1}); db.quotes.dropIndexes(); db.quotes.dropIndex({from: 1, text: 1}); db.quotes.reIndex(); Montag, 31. Mai 2010

map/reduce, we can haz it, too Montag, 31. Mai 2010

function() { this.tags.forEach(function(z) { emit(z, {count: 1}); }); } function(key, values) { var total = 0; values.forEach(function(v) { total += v }); return {count: total} } Montag, 31. Mai 2010

(it‘s not fast...) Montag, 31. Mai 2010

one more thing Montag, 31. Mai 2010

GridFS Montag, 31. Mai 2010

GridFS file storage ‣ Binary fields in BSON limited to 4MB ‣ GridFS API fixes that, files stored as chunks ‣ Use the language drivers Montag, 31. Mai 2010

I‘m in u‘r rubies, querying teh MongoDB! Montag, 31. Mai 2010

ruby integration ‣ mongo gem ‣ bson/ bson_ext gem ‣ mongo_mapper ‣ mongoid Montag, 31. Mai 2010

Basic driver usage Montag, 31. Mai 2010

require 'rubygems' require 'mongo' db = Mongo::Connection.new.db("test") doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now } db['quotes'].insert(doc) db['quotes'].find.each do |row| puts row.inspect end { "_id"=>$oid4bffe2896261046e79000001, "from"=>"Yogi Berra", "created_at"=>Fri May 28 15:34:33 UTC 2010, "text"=>"You can observe a lot just by watching." } Montag, 31. Mai 2010

require 'rubygems' require 'mongo' db = Mongo::Connection.new.db("test") 100.times do |i| db['numbers'].insert({"i" => i}) end db['numbers'].find("i" => {"$lt" => 2}).each do |row| puts row.inspect end # {"_id"=>$oid4bffe4396261046f25000001, "i"=>0} # {"_id"=>$oid4bffe4396261046f25000002, "i"=>1} Montag, 31. Mai 2010

db['text_entries'].drop_index("tags_1") db['text_entries'].create_index("tags") db['text_entries'].index_information Montag, 31. Mai 2010

GridFS usage Montag, 31. Mai 2010

db = Mongo::Connection.new.db("test") grid = Mongo::Grid.new(db) id = grid.put("You can put Strings in here", :filename => 'test.txt') file = grid.get(id) puts file.filename puts file.read grid.delete(id) grid.put( File.open("/Users/jankrutisch/Dropbox/Photos/IMGP8989.jpg") ) Montag, 31. Mai 2010

fs = Mongo::GridFileSystem.new(db) fs.open("test.txt", "w") do |f| f.write "You can put stuff in here" end fs.open("test.txt", "r") do |f| puts f.read end fs.delete("test.txt") Montag, 31. Mai 2010

ODMs Montag, 31. Mai 2010

mongo_mapper ‣ By John Nunemaker (@jnunemaker) ‣ works ‣ a few quirks ‣ almost completely undocumented ‣ Some stuff is still missing Montag, 31. Mai 2010

# config/initializers/mongo_mapper.rb File.open(File.join(Rails.root, 'config/mongodb.yml'), 'r') do |f| @settings = YAML.load(f)[Rails.env] end MongoMapper.connection = Mongo::Connection.from_uri(@settings["connection"]) if @settings["connection"] MongoMapper.database = @settings["database"] Montag, 31. Mai 2010

class Loop include MongoMapper::Document key :name key :public, Boolean key :message_id key :plays_and_downloads, Integer belongs_to :user timestamps! end Montag, 31. Mai 2010

@loops = Loop.all( ! :user_id => {"$exists" => true}, ! :order => 'created_at DESC', ! :limit => 10 ) Montag, 31. Mai 2010

„created_at DESC“ ?!? Montag, 31. Mai 2010

mongoid Montag, 31. Mai 2010

mongoid ‣ By Durran Jordan (Hashrocket) ‣ Two major versions: ‣ 1.x (currently 1.9) for Rails 2.3 compatibility ‣ 2.x (currently 2.x beta) for Rails 3 compatibility ‣ Good documentation ‣ API is better (?) Montag, 31. Mai 2010

File.open(File.join(RAILS_ROOT, 'config/mongodb.yml'), 'r') do |f| @settings = YAML.load(f)[RAILS_ENV] end Mongoid::Config.instance.from_hash(@settings) Montag, 31. Mai 2010

class Loop include Mongoid::Document include Mongoid::Timestamps field :name field :public, :type => Boolean field :message_id field :plays_and_downloads, :type => Integer belongs_to_related :user end Montag, 31. Mai 2010

Criteria API ‣ A bit like Arel ‣ chainable method calls ‣ Named scopes Montag, 31. Mai 2010

Embedded Documents Montag, 31. Mai 2010

class Person include Mongoid::Document field :first_name field :last_name embeds_one :address embeds_many :phones end class Address include Mongoid::Document field :street field :city field :state field :post_code embedded_in :person, :inverse_of => :address end Montag, 31. Mai 2010

GridFS Montag, 31. Mai 2010

acts_as_attachment Montag, 31. Mai 2010

class Loop include Mongoid::Document include Mongoid::Timestamps include Mongoid::Grid field :name field :public, :type => Boolean field :message_id field :plays_and_downloads, :type => Integer attachment :nan end Montag, 31. Mai 2010

using MongoDB 4 real Montag, 31. Mai 2010

Installation is easy Montag, 31. Mai 2010

(if you‘re using Ubuntu) Montag, 31. Mai 2010

setting up replication Montag, 31. Mai 2010

$ mongod --master or master = true # mongodb.conf $ mongod --slave --source slaveserver.example.com slave = true source = slaveserver.example.com Montag, 31. Mai 2010

OpLog size! Montag, 31. Mai 2010

„security“ Montag, 31. Mai 2010

memory usage? Montag, 31. Mai 2010

limits? Montag, 31. Mai 2010

stability? Montag, 31. Mai 2010

bonus level Montag, 31. Mai 2010

you‘ve made it this far! Montag, 31. Mai 2010

MongoDB explain()ed Montag, 31. Mai 2010

db.text_entries.find({tags: "restaurant"}).limit(10).explain(); { ! "cursor" : "BtreeCursor tags_1", ! "indexBounds" : [ ! ! [ ! ! ! { ! ! ! ! "tags" : "restaurant" ! ! ! }, ! ! ! { ! ! ! ! "tags" : "restaurant" ! ! ! } ! ! ] ! ], ! "nscanned" : 210, ! "nscannedObjects" : 210, ! "n" : 10, ! "millis" : 0, ! [...] } Montag, 31. Mai 2010

My personal impression Montag, 31. Mai 2010

Extremely easy to grasp Montag, 31. Mai 2010

Normalisation suXXorZ Montag, 31. Mai 2010

Migrations hurt Montag, 31. Mai 2010

Seems to be very fast Montag, 31. Mai 2010

Some issues for small projects Montag, 31. Mai 2010

I Montag, 31. Mai 2010

thanks for listening. Montag, 31. Mai 2010

Moi ‣ jan.krutisch@mindmatters.de ‣ http://jan.krutisch.de/ ‣ http://github.com/halfbyte/ ‣ http://twitter.com/halfbyte ‣ http://www.mindmatters.de/ Montag, 31. Mai 2010

Pointers ‣ http://www.mongodb.org/ ‣ http://www.mongoid.org/ ‣ http://github.com/jnunemaker/mongo_mapper Montag, 31. Mai 2010

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MongoDB & Mongomapper 4 real

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