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on rails
railscamp hamburg, 2010
jan krutisch <[email protected]>http://jan.krutisch.de/
Samstag, 23. Oktober 2010
mongodb wtf? lol!?
Samstag, 23. Oktober 2010
document database
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document database
NoSQLincluded!
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10gen
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open source
http://github.com/mongodb/mongo
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id title descr pos_lat pos_lng
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{ "_id" : ObjectId("4c00245062610475a005afcd"), "address" : "Bernstorffstr. 174\n22767 Hamburg\nDE", "description" : null, "position" : { "lat" : 53.5600912, "lng" : 9.9596977 }, "tags" : [ "hausarzt", "naturheilverfahren", "akupunktur", "allgemeinmedizin" ], "title" : "Dr. med. Lilo Eisenbarth", "loxicon_id" : 808261 }
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✗Samstag, 23. Oktober 2010
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BSON
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BInary Serialized jsON
http://bsonspec.org/Samstag, 23. Oktober 2010
Wire
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Storage
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rich queries
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conceptually close to SQL
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easy to grasp
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flexible
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language integration
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on top: map/reduce
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Scaling
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Master/Slave replication
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Replica Sets (1.6)
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Primary
Member Member
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Prim
ary
Member Primary
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Member
Member Primary
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Autosharding (1.6)
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Durability
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No single server durability!
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fsyncs every 60s(configurable)
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Use Replication!
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Use write propagation locking
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Single Server Durability planned for 1.8
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mongo console
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$ mongo
Samstag, 23. Oktober 2010
> use testswitched 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() });
Samstag, 23. Oktober 2010
> use testswitched 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() });
Samstag, 23. Oktober 2010
Indexing
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Same concept as with SQL databases
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You want them
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Same concept as with SQL databases
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Sort order
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Unique
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Compound
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Geospatial
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map/reduce
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we can haz it, too
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function() { this.tags.forEach(function(z) { emit(z, {count: 1}); });}
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function(key, values) { var total = 0; values.forEach(function(v) { total += v.count }); return {count: total}}
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(it‘s not fast...)
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security
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simple user/password auth
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per database
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read only is possible
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one more thing
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GridFS
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Binary fields in BSON < 4MB
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GridFS saves files in chunks
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I‘m in u‘r rubies,querying teh MongoDB!
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core driver
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mongo / bson_ext
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ODMs / Libs
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mongo_mapper
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mongoid
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Find examples here:http://github.com/halfbyte/mongo_ruby_examples
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Basic driver usage
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init
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require 'mongo'
@connection = Mongo::Connection.new@db = @connection.db("test")
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@connection = Mongo::Connection.new( 'localhost', 27017, :pool_size => 5, :timeout => 20)
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@connection = Mongo::Connection.from_uri( "mongodb://localhost:27017/test")
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insert/upsert
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doc = { :text => "You can observe a lot just by watching.", :from => "Yogi Berra", :created_at => Time.now}@db['quotes'].insert(doc)
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doc = @db['quotes'].find_one(id)
doc[:from] = "Yogi Berra, famous baseball player"
@db['quotes'].save(doc)
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atomic updates
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@db['quotes'].update( {"from" => "Yogi Berra"}, {"$inc" => {"reads" => 1 } })
Samstag, 23. Oktober 2010
@db['quotes'].update( {"from" => "Yogi Berra"}, {"$inc" => {"reads" => 1 } })
Samstag, 23. Oktober 2010
$inc$set$unset$push$pushAll
$addToSet$pop$pull$pullAll$
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getting a whole collection
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@db['quotes'].find.each do |row| puts row.inspectend
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exact query
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@db['quotes'].find(:from => "Yogi Berra")
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more queries
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100.times do |i| db['numbers'].insert({"i" => i})end
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db['numbers'].find("i" => {"$lt" => 2})
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$lt <$gt >$lte <=$gte >=$ne !=
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@db['people'].find(:tags => {"$in" => ['cool']})
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obj = { "_id"=>BSON::ObjectID('4c706af16261040680000369'), "name"=>"Vernon Kreiger", "address"=>{ "street"=>"536 Haleigh Locks", "city"=>"Port Kiannahaven", "zip"=>"80730-0214", "country"=>"Fakistan" }, "tags"=>["cool", "weird"]}
Samstag, 23. Oktober 2010
obj = { "_id"=>BSON::ObjectID('4c706af16261040680000369'), "name"=>"Vernon Kreiger", "address"=>{ "street"=>"536 Haleigh Locks", "city"=>"Port Kiannahaven", "zip"=>"80730-0214", "country"=>"Fakistan" }, "tags"=>["cool", "weird"]}
Samstag, 23. Oktober 2010
$in IN (2,3,4)$nin NOT IN$all [2,3] ~ [1,2,3]
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$mod yah, RLY$size okay$exists NOT NULL$type huh?
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@db['people'].find("address.city" => /haven/)
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@db['people'].find("address.city" => /haven/)
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Sorting
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@db['people'].find().sort("address.street")
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@db['people'].find().sort("address.street")
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Pagination
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@db['numbers'].find.sort("i").limit(10)
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@db['numbers'].find.sort("i").limit(10).skip(50)
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Counting
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@db['numbers'].find.count
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Distinct
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@db['people'].distinct('tags').inspect
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Group
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Poor mans map/reduce
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@db['people'].group( ['created_at'], {}, {:tags => {}}, reduce, finalize)
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@db['people'].group( ['created_at'], {}, {:tags => {}}, reduce, finalize)
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@db['people'].group( ['created_at'], {}, {:tags => {}}, reduce, finalize)
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@db['people'].group( ['created_at'], {}, {:tags => {}}, reduce, finalize)
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@db['people'].group( ['created_at'], {}, {:tags => {}}, reduce, finalize)
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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 } }}
Samstag, 23. Oktober 2010
{"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}}
Samstag, 23. Oktober 2010
{"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}
Samstag, 23. Oktober 2010
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}
Samstag, 23. Oktober 2010
{"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}
Samstag, 23. Oktober 2010
Map / Reduce
Samstag, 23. Oktober 2010
map = <<-END function() { this.tags.forEach(function(z) { emit(z, {count: 1}); }); }ENDreduce = <<-END function(key, values) { var total = 0; values.forEach(function(v) { total += v.count }); return {count: total} }END
collection = @db['people'].map_reduce( map, reduce)
Samstag, 23. Oktober 2010
Indexes
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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
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Geospatial stuff
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@db['people'].create_index( [["latlng", Mongo::GEO2D]])
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@db['people'].find( "latlng" => {"$near" => [53.593978, 10.107380]})
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GridFS usage
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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"))
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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")
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Capped collections
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@db.create_collection('capped_numbers', :capped => true, :max => 50)
@db.create_collection('capped_numbers', :capped => true, :size => 1024 * 64)
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explain
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@db['people'].find( "address.city" => /haven/).explain
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@db['people'].find( "address.city" => /haven/).explain
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{ "cursor"=>"BasicCursor", "nscanned"=>1000, "nscannedObjects"=>1000, "n"=>39, "millis"=>2, "indexBounds"=>{}, "allPlans"=>[ {"cursor"=>"BasicCursor", "indexBounds"=>{}} ]}
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{ "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/]] } } ]}
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ODMs
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mongo_mapper
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John Nunemaker@jnunemaker
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is in production
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documentation?
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how to
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rails initializer
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# config/initializers/mongo_mapper.rbFile.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"]
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a simple example
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MongoMapper.connection = @connectionMongoMapper.database = "test"
class Quote include MongoMapper::Document key :from key :text key :views, Integer timestamps!end
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finders
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Quote.where(:from => 'Yogi Berra').all
Quote.where(:from => 'Yogi Berra').limit(5).sort(:from.desc).all
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embedded docs
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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
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person = Person.firstaddress = Person.first.address
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scopes
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class Person scope :tagged, lambda { |tag| where(:tags.in => [tag]) }end
puts Person.tagged('cool').first.inspect
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new website coming soon
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mongoid
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Durran Jordan(of Hashrocket)
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Two major versions
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1.x (1.9.x) targeting Rails 2.3.x
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2.x (2.0beta) targeting Rails 3.0
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Good documentation
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rails initializer
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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)
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a simple example
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class Quote include Mongoid::Document include Mongoid::Timestamps field :from field :text field :views, :type => Integerend
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finders
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Quote.where(:from => 'Yogi Berra').all
Quote.where(:from => 'Yogi Berra').limit(5).order_by(:from.desc).all
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embedded docs
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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
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person = Person.firstaddress = Person.first.address
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scopes
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class Person scope :tagged, lambda { |tag| where(:tags.in => [tag]) }end
puts Person.tagged('cool').first.inspect
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More features
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atomic updates
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mongoid tries to be clever
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(using the „dirty“ flags)
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(it‘s probably better to bypass the ODM sometimes)
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GridFS
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external libraries for both
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mongo_mapper > grip
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mongoid > mongoid_grid
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Other noteworthy libraries
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Other not so noteworthy libraries
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I ♥
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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
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