MongoDB on Rails (and Ruby)

on ruby

mongo berlin 2010

jan krutisch <[email protected]>http://jan.krutisch.de/

and rails

Donnerstag, 7. Oktober 2010

mailto:[email protected]


http://jan.krutisch.de


I


I

Web Developer


I

Web Developer


I

Web Developer

github.com/halfbyte


I

Web Developer

jan.krutisch.de

github.com/halfbyte


I

Web Developer

Tinkerer

jan.krutisch.de

github.com/halfbyte


I

Web Developer

Tinkerer

twitter.com/halfbyte

jan.krutisch.de

github.com/halfbyte


ruby


Find examples here:http://github.com/halfbyte/mongo_ruby_examples


http://github.com/halfbyte/mongo_ruby_examples


Basic driver usage


gem install mongo bson_ext


init


getting connections


@connection = Mongo::Connection.new


@connection = Mongo::Connection.new( 'localhost', 27017, :pool_size => 5, :timeout => 20)


@connection = Mongo::Connection.from_uri( "mongodb://localhost:27017/test")


Choose a database.


@connection.database_names#=> ["admin", "local"]


@db = @connection['test']


@db = @connection.db('test')


collections


@collection = @db['books']


@collection = @db.collection('books')


subcollections


@collection = @db['books.reviews']


@collection = @db['books']['reviews']


C R U D


Create Read Update Delete




insert


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}@db['quotes'].insert(doc)


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}@db['quotes'].save(doc)


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}@db['quotes'].save(doc)


safe (using getlasterror)


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}@db['quotes'].save(doc, :safe => true)


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}@db['quotes'].save(doc, :safe => true)


how about getting back an id?


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}id = @db['quotes'].save(doc)


doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}id = @db['quotes'].save(doc)








upsert


doc = @db['quotes'].find_one(id)

doc[:from] = "Yogi Berra, famous baseball player"

@db['quotes'].save(doc)






@db['quotes'].update( {:_id => doc['_id']}, { :from => "Yogi Berra", :text => "You can observe a lot just by watching.", :tags => ['baseball', 'wit'] })


atomic updates


@db['quotes'].update( {"from" => "Yogi Berra"}, {"$inc" => {"reads" => 1 } })


@db['quotes'].update( {"from" => "Yogi Berra"}, {"$inc" => {"reads" => 1 } })


$inc$set$unset$push$pushAll

$addToSet$pop$pull$pullAll$


@db['people'].update( {"tags" => "cool"}, "$addToSet" => {"tags" => 'froody'}, :multi => true)


@db['people'].update( {"tags" => "cool"}, "$addToSet" => {"tags" => 'froody'}, :multi => true)


@db['people'].update( {"tags" => "cool"}, { "$addToSet" => { "tags" => { "$each" => ['froody', 'hoopy'] } } }, :safe => true, :multi => true)


@db['people'].update( {"tags" => "cool"}, { "$addToSet" => { "tags" => { "$each" => ['froody', 'hoopy'] } } }, :safe => true, :multi => true)


@db['people'].update( {"tags" => "cool"}, {"$set" => {"tags.$" => "fresh"}}, :safe => true, :multi => true)


@db['people'].update( {"tags" => "cool"}, {"$set" => {"tags.$" => "fresh"}}, :safe => true, :multi => true)






@db['people'].remove


@db['numbers'].remove( {"$lt" => 30}, :safe => true)






all


@db['quotes'].find.each do |row| puts row.inspectend


one


row = @db['quotes'].find_one


exact query


@db['quotes'].find(:from => "Yogi Berra")


more queries


100.times do |i| db['numbers'].insert({"i" => i})end


db['numbers'].find("i" => {"$lt" => 2})


$lt <$gt >$lte <=$gte >=$ne !=


@db['people'].find( :tags => { "$in" => ['cool', 'weird'] })


obj = { "_id"=>BSON::ObjectID('4c706af16261040680000369'), "name"=>"Vernon Kreiger", "address"=>{ "street"=>"536 Haleigh Locks", "city"=>"Port Kiannahaven", "zip"=>"80730-0214", "country"=>"Fakistan" }, "tags"=>["cool", "weird"]}


obj = { "_id"=>BSON::ObjectID('4c706af16261040680000369'), "name"=>"Vernon Kreiger", "address"=>{ "street"=>"536 Haleigh Locks", "city"=>"Port Kiannahaven", "zip"=>"80730-0214", "country"=>"Fakistan" }, "tags"=>["cool", "weird"]}


$in IN (2,3,4)$nin NOT IN$all [2,3] ~ [1,2,3]


$mod yah, RLY$size okay$exists NOT NULL$type huh?


Let‘s go deep.


@db['people'].find("address.city" => "Berlin")


@db['people'].find("address.city" => "Berlin")


/stand back/


@db['people'].find("address.city" => /haven/)


@db['people'].find("address.city" => /haven/)


I‘m in ur database, executin ur javascript


@db['numbers'].find("$where" => "this.i < 2")


boolsh


not


@db['numbers'].find( "i" => { "$not" => {"$lt" => 97} })


and


@db['numbers'].find( "i" => { "$lt" => 52, "$gt" => 48 })


or


@db['numbers'].find( "$or" => [ { "i" => { "$lt" => 2 } }, { "i" => { "$gt" => 97 } } ])


Sorting


@db['people'].find().sort("address.street")








@db['people'].find().sort("address.street", :asc)


@db['people'].find().sort("address.street", :asc)


@db['people'].find().sort( "address.street", Mongo::ASCENDING)


@db['people'].find().sort( "address.street", Mongo::ASCENDING)


Pagination


@db['numbers'].find.sort("i").limit(10)


@db['numbers'].find.sort("i").limit(10).skip(50)


Aggregation


Countin‘ Bizness


@db['numbers'].find.count


Distinct


@db['people'].distinct('tags')


Group


Poor mans map/reduce


@db['people'].group( ['created_at'], {}, {:tags => {}}, reduce, finalize)










function(doc, prev) { for(i in doc.tags) { if (doc.tags[i] in prev.tags) { prev.tags[doc.tags[i]]++ } else { prev.tags[doc.tags[i]] =1 } }}


{"created_at"=>2010-09-19 22:00:00 UTC, "tags"=>{"foo"=>11.0, "dumb"=>12.0, "stupid"=>7.0, "bar"=>7.0, "cool"=>14.0, "weird"=>17.0}}{"created_at"=>2010-09-20 22:00:00 UTC, "tags"=>{"dumb"=>11.0, "stupid"=>5.0, "foo"=>10.0, "cool"=>8.0, "weird"=>9.0, "bar"=>15.0}}{"created_at"=>2010-09-22 22:00:00 UTC, "tags"=>{"weird"=>15.0, "bar"=>9.0, "stupid"=>17.0, "cool"=>11.0, "dumb"=>10.0, "foo"=>12.0}}{"created_at"=>2010-09-15 22:00:00 UTC, "tags"=>{"foo"=>11.0, "weird"=>7.0, "stupid"=>10.0, "cool"=>11.0, "bar"=>5.0, "dumb"=>8.0}}{"created_at"=>2010-09-25 22:00:00 UTC, "tags"=>{"dumb"=>11.0, "weird"=>14.0, "cool"=>8.0, "foo"=>21.0, "bar"=>11.0, "stupid"=>13.0}}{"created_at"=>2010-09-28 22:00:00 UTC, "tags"=>{"cool"=>11.0, "dumb"=>16.0, "stupid"=>11.0, "weird"=>15.0, "foo"=>9.0, "bar"=>16.0}}{"created_at"=>2010-09-10 22:00:00 UTC, "tags"=>{"dumb"=>15.0, "weird"=>9.0, "bar"=>8.0, "cool"=>14.0, "stupid"=>11.0, "foo"=>11.0}}{"created_at"=>2010-09-03 22:00:00 UTC, "tags"=>{"weird"=>14.0, "dumb"=>15.0, "stupid"=>11.0, "foo"=>16.0, "bar"=>20.0, "cool"=>10.0}}{"created_at"=>2010-09-21 22:00:00 UTC, "tags"=>{"weird"=>15.0, "cool"=>14.0, "foo"=>13.0, "stupid"=>6.0, "bar"=>11.0, "dumb"=>9.0}}{"created_at"=>2010-09-23 22:00:00 UTC, "tags"=>{"weird"=>15.0, "stupid"=>15.0, "dumb"=>15.0, "foo"=>16.0, "cool"=>10.0, "bar"=>11.0}}{"created_at"=>2010-09-29 22:00:00 UTC, "tags"=>{"bar"=>9.0, "cool"=>14.0, "weird"=>16.0, "foo"=>8.0, "dumb"=>9.0, "stupid"=>12.0}}{"created_at"=>2010-09-27 22:00:00 UTC, "tags"=>{"cool"=>13.0, "dumb"=>10.0, "stupid"=>12.0, "bar"=>8.0, "foo"=>16.0, "weird"=>13.0}}{"created_at"=>2010-09-04 22:00:00 UTC, "tags"=>{"cool"=>11.0, "bar"=>9.0, "stupid"=>6.0, "weird"=>11.0, "dumb"=>8.0, "foo"=>11.0}}{"created_at"=>2010-09-08 22:00:00 UTC, "tags"=>{"stupid"=>12.0, "dumb"=>11.0, "cool"=>15.0, "foo"=>11.0, "bar"=>9.0, "weird"=>8.0}}{"created_at"=>2010-10-02 22:00:00 UTC, "tags"=>{"bar"=>8.0, "dumb"=>8.0, "cool"=>10.0, "foo"=>10.0, "stupid"=>8.0, "weird"=>6.0}}{"created_at"=>2010-09-24 22:00:00 UTC, "tags"=>{"foo"=>13.0, "bar"=>12.0, "stupid"=>15.0, "weird"=>17.0, "dumb"=>7.0, "cool"=>10.0}}{"created_at"=>2010-09-30 22:00:00 UTC, "tags"=>{"bar"=>10.0, "cool"=>6.0, "stupid"=>14.0, "weird"=>9.0, "dumb"=>12.0, "foo"=>19.0}}{"created_at"=>2010-09-05 22:00:00 UTC, "tags"=>{"dumb"=>12.0, "foo"=>19.0, "weird"=>8.0, "stupid"=>8.0, "bar"=>7.0, "cool"=>10.0}}{"created_at"=>2010-09-17 22:00:00 UTC, "tags"=>{"weird"=>13.0, "bar"=>14.0, "dumb"=>12.0, "foo"=>12.0, "stupid"=>10.0, "cool"=>9.0}}{"created_at"=>2010-09-18 22:00:00 UTC, "tags"=>{"dumb"=>8.0, "cool"=>11.0, "foo"=>6.0, "bar"=>12.0, "weird"=>7.0, "stupid"=>6.0}}{"created_at"=>2010-09-09 22:00:00 UTC, "tags"=>{"weird"=>11.0, "dumb"=>9.0, "foo"=>6.0, "bar"=>11.0, "cool"=>11.0, "stupid"=>6.0}}{"created_at"=>2010-09-13 22:00:00 UTC, "tags"=>{"dumb"=>19.0, "stupid"=>9.0, "weird"=>12.0, "cool"=>11.0, "bar"=>10.0, "foo"=>15.0}}{"created_at"=>2010-09-16 22:00:00 UTC, "tags"=>{"bar"=>6.0, "weird"=>8.0, "dumb"=>9.0, "cool"=>11.0, "stupid"=>17.0, "foo"=>15.0}}{"created_at"=>2010-09-11 22:00:00 UTC, "tags"=>{"foo"=>10.0, "weird"=>9.0, "bar"=>8.0, "cool"=>4.0, "dumb"=>8.0, "stupid"=>9.0}}{"created_at"=>2010-09-26 22:00:00 UTC, "tags"=>{"dumb"=>15.0, "weird"=>6.0, "stupid"=>15.0, "bar"=>10.0, "foo"=>13.0, "cool"=>15.0}}{"created_at"=>2010-10-01 22:00:00 UTC, "tags"=>{"cool"=>7.0, "weird"=>11.0, "stupid"=>11.0, "bar"=>14.0, "foo"=>12.0, "dumb"=>11.0}}{"created_at"=>2010-09-12 22:00:00 UTC, "tags"=>{"bar"=>7.0, "weird"=>12.0, "stupid"=>11.0, "cool"=>10.0, "foo"=>11.0, "dumb"=>9.0}}{"created_at"=>2010-09-14 22:00:00 UTC, "tags"=>{"dumb"=>8.0, "foo"=>15.0, "cool"=>15.0, "stupid"=>15.0, "bar"=>7.0, "weird"=>14.0}}{"created_at"=>2010-09-07 22:00:00 UTC, "tags"=>{"dumb"=>10.0, "cool"=>7.0, "foo"=>14.0, "weird"=>15.0, "bar"=>11.0, "stupid"=>7.0}}{"created_at"=>2010-09-06 22:00:00 UTC, "tags"=>{"dumb"=>7.0, "bar"=>11.0, "cool"=>16.0, "weird"=>14.0, "foo"=>12.0, "stupid"=>6.0}}


{"created_at"=>2010-09-19 22:00:00 UTC, "tags"=>{"foo"=>11.0, "dumb"=>12.0, "stupid"=>7.0, "bar"=>7.0, "cool"=>14.0, "weird"=>17.0}}{"created_at"=>2010-09-20 22:00:00 UTC, "tags"=>{"dumb"=>11.0, "stupid"=>5.0, "foo"=>10.0, "cool"=>8.0, "weird"=>9.0, "bar"=>15.0}}{"created_at"=>2010-09-22 22:00:00 UTC, "tags"=>{"weird"=>15.0, "bar"=>9.0, "stupid"=>17.0, "cool"=>11.0, "dumb"=>10.0, "foo"=>12.0}}{"created_at"=>2010-09-15 22:00:00 UTC, "tags"=>{"foo"=>11.0, "weird"=>7.0, "stupid"=>10.0, "cool"=>11.0, "bar"=>5.0, "dumb"=>8.0}}{"created_at"=>2010-09-25 22:00:00 UTC, "tags"=>{"dumb"=>11.0, "weird"=>14.0, "cool"=>8.0, "foo"=>21.0, "bar"=>11.0, "stupid"=>13.0}}{"created_at"=>2010-09-28 22:00:00 UTC, "tags"=>{"cool"=>11.0, "dumb"=>16.0, "stupid"=>11.0, "weird"=>15.0, "foo"=>9.0, "bar"=>16.0}}{"created_at"=>2010-09-10 22:00:00 UTC, "tags"=>{"dumb"=>15.0, "weird"=>9.0, "bar"=>8.0, "cool"=>14.0, "stupid"=>11.0, "foo"=>11.0}}{"created_at"=>2010-09-03 22:00:00 UTC, "tags"=>{"weird"=>14.0, "dumb"=>15.0, "stupid"=>11.0, "foo"=>16.0, "bar"=>20.0, "cool"=>10.0}}{"created_at"=>2010-09-21 22:00:00 UTC, "tags"=>{"weird"=>15.0, "cool"=>14.0, "foo"=>13.0, "stupid"=>6.0, "bar"=>11.0, "dumb"=>9.0}}{"created_at"=>2010-09-23 22:00:00 UTC, "tags"=>{"weird"=>15.0, "stupid"=>15.0, "dumb"=>15.0, "foo"=>16.0, "cool"=>10.0, "bar"=>11.0}}{"created_at"=>2010-09-29 22:00:00 UTC, "tags"=>{"bar"=>9.0, "cool"=>14.0, "weird"=>16.0, "foo"=>8.0, "dumb"=>9.0, "stupid"=>12.0}}{"created_at"=>2010-09-27 22:00:00 UTC, "tags"=>{"cool"=>13.0, "dumb"=>10.0, "stupid"=>12.0, "bar"=>8.0, "foo"=>16.0, "weird"=>13.0}}{"created_at"=>2010-09-04 22:00:00 UTC, "tags"=>{"cool"=>11.0, "bar"=>9.0, "stupid"=>6.0, "weird"=>11.0, "dumb"=>8.0, "foo"=>11.0}}{"created_at"=>2010-09-08 22:00:00 UTC, "tags"=>{"stupid"=>12.0, "dumb"=>11.0, "cool"=>15.0, "foo"=>11.0, "bar"=>9.0, "weird"=>8.0}}{"created_at"=>2010-10-02 22:00:00 UTC, "tags"=>{"bar"=>8.0, "dumb"=>8.0, "cool"=>10.0, "foo"=>10.0, "stupid"=>8.0, "weird"=>6.0}}{"created_at"=>2010-09-24 22:00:00 UTC, "tags"=>{"foo"=>13.0, "bar"=>12.0, "stupid"=>15.0, "weird"=>17.0, "dumb"=>7.0, "cool"=>10.0}}{"created_at"=>2010-09-30 22:00:00 UTC, "tags"=>{"bar"=>10.0, "cool"=>6.0, "stupid"=>14.0, "weird"=>9.0, "dumb"=>12.0, "foo"=>19.0}}{"created_at"=>2010-09-05 22:00:00 UTC, "tags"=>{"dumb"=>12.0, "foo"=>19.0, "weird"=>8.0, "stupid"=>8.0, "bar"=>7.0, "cool"=>10.0}}{"created_at"=>2010-09-17 22:00:00 UTC, "tags"=>{"weird"=>13.0, "bar"=>14.0, "dumb"=>12.0, "foo"=>12.0, "stupid"=>10.0, "cool"=>9.0}}{"created_at"=>2010-09-18 22:00:00 UTC, "tags"=>{"dumb"=>8.0, "cool"=>11.0, "foo"=>6.0, "bar"=>12.0, "weird"=>7.0, "stupid"=>6.0}}{"created_at"=>2010-09-09 22:00:00 UTC, "tags"=>{"weird"=>11.0, "dumb"=>9.0, "foo"=>6.0, "bar"=>11.0, "cool"=>11.0, "stupid"=>6.0}}{"created_at"=>2010-09-13 22:00:00 UTC, "tags"=>{"dumb"=>19.0, "stupid"=>9.0, "weird"=>12.0, "cool"=>11.0, "bar"=>10.0, "foo"=>15.0}}{"created_at"=>2010-09-16 22:00:00 UTC, "tags"=>{"bar"=>6.0, "weird"=>8.0, "dumb"=>9.0, "cool"=>11.0, "stupid"=>17.0, "foo"=>15.0}}{"created_at"=>2010-09-11 22:00:00 UTC, "tags"=>{"foo"=>10.0, "weird"=>9.0, "bar"=>8.0, "cool"=>4.0, "dumb"=>8.0, "stupid"=>9.0}}{"created_at"=>2010-09-26 22:00:00 UTC, "tags"=>{"dumb"=>15.0, "weird"=>6.0, "stupid"=>15.0, "bar"=>10.0, "foo"=>13.0, "cool"=>15.0}}{"created_at"=>2010-10-01 22:00:00 UTC, "tags"=>{"cool"=>7.0, "weird"=>11.0, "stupid"=>11.0, "bar"=>14.0, "foo"=>12.0, "dumb"=>11.0}}{"created_at"=>2010-09-12 22:00:00 UTC, "tags"=>{"bar"=>7.0, "weird"=>12.0, "stupid"=>11.0, "cool"=>10.0, "foo"=>11.0, "dumb"=>9.0}}{"created_at"=>2010-09-14 22:00:00 UTC, "tags"=>{"dumb"=>8.0, "foo"=>15.0, "cool"=>15.0, "stupid"=>15.0, "bar"=>7.0, "weird"=>14.0}}{"created_at"=>2010-09-07 22:00:00 UTC, "tags"=>{"dumb"=>10.0, "cool"=>7.0, "foo"=>14.0, "weird"=>15.0, "bar"=>11.0, "stupid"=>7.0}}{"created_at"=>2010-09-06 22:00:00 UTC, "tags"=>{"dumb"=>7.0, "bar"=>11.0, "cool"=>16.0, "weird"=>14.0, "foo"=>12.0, "stupid"=>6.0}}

"tags" => { "foo" => 11.0, "dumb" => 12.0, "stupid" => 7.0, "bar" => 7.0, "cool" => 14.0, "weird" => 17.0}


function(prev) { var mostPopular = 0; for(i in prev.tags) { if(prev.tags[i] > mostPopular) { prev.tag = i; prev.count = prev.tags[i]; mostPopular = prev.tags[i]; } } delete prev.tags}


{"created_at"=>2010-09-27 22:00:00 UTC, "tag"=>"stupid", "count"=>18.0}{"created_at"=>2010-09-29 22:00:00 UTC, "tag"=>"stupid", "count"=>20.0}{"created_at"=>2010-09-12 22:00:00 UTC, "tag"=>"cool", "count"=>11.0}{"created_at"=>2010-09-04 22:00:00 UTC, "tag"=>"stupid", "count"=>12.0}{"created_at"=>2010-09-21 22:00:00 UTC, "tag"=>"stupid", "count"=>16.0}{"created_at"=>2010-09-03 22:00:00 UTC, "tag"=>"foo", "count"=>15.0}{"created_at"=>2010-09-26 22:00:00 UTC, "tag"=>"foo", "count"=>17.0}{"created_at"=>2010-09-18 22:00:00 UTC, "tag"=>"foo", "count"=>17.0}{"created_at"=>2010-09-24 22:00:00 UTC, "tag"=>"cool", "count"=>11.0}


Map / Reduce


collection = @db['people'].map_reduce( map, reduce)collection.find()


function() { this.tags.forEach(function(z) { emit(z, {count: 1}); });}


function(key, values) { var total = 0; values.forEach(function(v) { total += v.count }); return {count: total}}


Indexes


db['people'].create_index("tags")

@db['people'].create_index( [["tags", Mongo::ASCENDING]])

db['people'].drop_index("tags_1")

db['people'].drop_indexes

db['people'].index_information


Geospatial stuff


@db['people'].create_index( [["latlng", Mongo::GEO2D]])


@db['people'].find( "latlng" => {"$near" => [53.593978, 10.107380]})


GridFS usage


grid = Mongo::Grid.new(@db)

id = grid.put("You can put Strings in here", :filename => 'test.txt')

file = grid.get(id)

file.filenamefile.read

grid.delete(id)

grid.put( File.open("/Users/jankrutisch/Dropbox/Photos/IMGP8989.jpg"))


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.readend

fs.delete("test.txt")


Capped collections


@db.create_collection('capped_numbers', :capped => true, :max => 50)

@db.create_collection('capped_numbers', :capped => true, :size => 1024 * 64)


explain


@db['people'].find( "address.city" => /haven/).explain


@db['people'].find( "address.city" => /haven/).explain


{ "cursor"=>"BasicCursor", "nscanned"=>1000, "nscannedObjects"=>1000, "n"=>39, "millis"=>2, "indexBounds"=>{}, "allPlans"=>[ {"cursor"=>"BasicCursor", "indexBounds"=>{}} ]}


{ "cursor"=>"BtreeCursor address.city_1 multi", "nscanned"=>1000, "nscannedObjects"=>39, "n"=>39, "millis"=>1, "indexBounds"=>{ "address.city"=>[["", {}], [/haven/, /haven/]] }, "allPlans"=>[ { "cursor"=>"BtreeCursor address.city_1 multi", "indexBounds"=>{ "address.city"=>[["", {}], [/haven/, /haven/]] } } ]}


misc commands


@db.stats

{ "collections"=>4, "objects"=>1011, "avgObjSize"=>244.6330365974283, "dataSize"=>247324, "storageSize"=>345600, "numExtents"=>6, "indexes"=>3, "indexSize"=>114688, "fileSize"=>201326592, "ok"=>1.0}


@db.add_stored_function( "tag_size", "function(obj) {return obj.tags.length}")

@db['people'].find( "$where" => 'tag_size(this) === 2')


@db.add_stored_function( "tag_size", "function(obj) {return obj.tags.length}")

@db['people'].find( "$where" => 'tag_size(this) === 2')


Libraries


mongo_mapper


John Nunemaker@jnunemaker


is in production


documentation?



how to


rails initializer


# config/initializers/mongo_mapper.rbmongo_config = YAML.load_file( File.join(Rails.root, 'config','mongomapper.yml'))MongoMapper.setup(mongo_config, Rails.env)


a simple example


MongoMapper.connection = @connectionMongoMapper.database = "test"

class Quote include MongoMapper::Document key :from key :text key :views, Integer timestamps!end


finders


Quote.where(:from => 'Yogi Berra').all

Quote.where(:from => 'Yogi Berra').limit(5).sort(:from.desc).all


embedded docs


class Person include MongoMapper::Document key :name one :address key :tags, Arrayend

class Address include MongoMapper::Document key :street key :city key :country key :zipend


person = Person.firstaddress = Person.first.address


scopes


class Person scope :tagged, lambda { |tag| where(:tags.in => [tag]) }end

puts Person.tagged('cool').first.inspect


new website coming soon


new website coming soonUnfortunately I‘ve already said that

@ FrOSCON in August


new website coming soonUnfortunately I‘ve already said that

@ FrOSCON in August


mongoid


Durran Jordan(of Hashrocket)


Two major versions


1.x (1.9.x) targeting Rails 2.3.x


2.x (2.0beta) targeting Rails 3.0


Good documentation



rails initializer


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)


a simple example


class Quote include Mongoid::Document include Mongoid::Timestamps field :from field :text field :views, :type => Integerend


finders


Quote.where(:from => 'Yogi Berra').all

Quote.where(:from => 'Yogi Berra').limit(5).order_by(:from.desc).all


embedded docs


class Person include Mongoid::Document field :name embeds_one :address field :tags, :type => Arrayend

class Address include Mongoid::Document field :street field :city field :country field :zipend


person = Person.firstaddress = Person.first.address


scopes


class Person scope :tagged, lambda { |tag| where(:tags.in => [tag]) }end

puts Person.tagged('cool').first.inspect


More features


atomic updates


mongoid tries to be clever


(using the „dirty“ flags)


(it‘s probably better to bypass the ODM sometimes)


GridFS


external libraries for both


mongo_mapper > grip


mongoid > mongoid_grid


validations


both through ActiveModel or validatable (Rails <3)


Other noteworthy libraries


The „ORM“ variant


mongodoc

http://github.com/leshill/mongodoc




mongo-record

http://github.com/mongodb/mongo-record




mongomodel

http://github.com/spohlenz/mongomodel




mongomatic

http://github.com/benmyles/mongomatic




Queues


mongo_queue

http://github.com/Skiz/mongo_queue




mongo_queue

http://github.com/Skiz/mongo_queue

Last commit on github.com in March...




resque-mongo

http://github.com/ctrochalakis/resque-mongo




resque-mongo

http://github.com/ctrochalakis/resque-mongo

Last commit on github.com in January...




Misc


em-mongo

http://github.com/bcg/em-mongo




dm-mongo-adapter

http://github.com/solnic/dm-mongo-adapter




questions? injuries?


I ♥


thanks for listening.

‣ [email protected]‣ http://jan.krutisch.de/‣ http://github.com/halfbyte/‣ http://twitter.com/halfbyte‣ http://www.mindmatters.de/

‣ http://www.mongodb.org/‣ http://www.mongoid.org/‣ http://github.com/jnunemaker/mongo_mapper‣ http://github.com/halfbyte/mongo_ruby_examples






http://github.com/halfbyte/

http://github.com/halfbyte/

http://twitter.com/halfbyte

http://twitter.com/halfbyte

http://www.mindmatters.de

http://www.mindmatters.de

http://www.mongodb.org

http://www.mongodb.org

http://www.mongoid.org

http://www.mongoid.org

http://github.com/jnunemaker/mongo_mapper

http://github.com/jnunemaker/mongo_mapper



Technology

MongoDB on Rails (and Ruby)