This document discusses NoSQL databases and MongoDB. It introduces MongoDB and its data structure and queries. It then describes MongoMapper, a Ruby library that provides an ActiveRecord-like interface for MongoDB. It shows how to define MongoDB document schemas and queries using MongoMapper.

1. NoSQL Ruby
n

2. NoSQL Ruby
1
n=1

3. (@Sixeight)

4. • NoSQL
• MongoDB
• MongoMapper
•

5. • NoSQL
• MongoDB
• MongoMapper
•

6. NoSQL

7. SQL

8. ×
SQL

9. Not only SQL

13. CREATE TABLE cats (
id int NOT NULL,
name text,
PRIMARY KEY (id)
);
INSERT INTO cats VALUES (1, “tama”);

14. CREATE TABLE cats (
id int NOT NULL,
name text,
PRIMARY KEY (id)
);
INSERT INTO cats VALUES (1, “tama”);

15. $ mongo
> db.cats.insert({name: “tama”})

16. $ mongo
> db.cats.insert({name: “tama”})
> db.cats.insert({
name: “goro”,
dapple_color: “gray”
})
> db.cats.find()
{ "_id" : ObjectId("4c49118783d1600c126d2147"), "name" : "tama" }
{ "_id" : ObjectId("4c49119983d1600c126d2148"), "name" : "goro", "dapple_color" : "gray" }

18. • Google BigTable
• amazon Dynamo
• HBase
• Apache Casandra
• CounchDB
• MongoDB
• and more

19. • Google BigTable
• amazon Dynamo
• HBase
• Apache Casandra
• CounchDB
• MongoDB
• and more

20. • Google BigTable
• amazon Dynamo
• HBase
• Apache Casandra
• CounchDB
• MongoDB
• and more

21. • NoSQL
• MongoDB
• MongoMapper
•

22. MongoDB
by 10gen

23. MongoDB C++
(wikipedia)

24. MongoDB C++
(wikipedia)

25. • (the simplicity and power of JSON-like data schemas)
•
• Index
•
• in-place
• large objects ( )
•
• sharding
• MapReduce
•

30. ≒
≒

32. { "_id" : ###, "name" : "tama" }

33. { "_id" : ###, "name" : "tama" }
{ "_id" : ###, "name" : "goro", "dapple_color" : "gray" }

34. { "_id" : ###, "name" : "tama" }
{ "_id" : ###, "name" : "goro", "dapple_color" : "gray" }

37. over 200 projects

38. • NoSQL
• MongoDB
• MongoMapper
•

39. MongoMapper
http://github.com/jnunemaker/mongomapper

40. ActiveRecord API
+

41. gem install mongo_mapper

43. class Cats
include MongoMapper::Document
key :name, String
end

44. irb

45. class Cats
include MongoMapper::Document
key :name, String
end

46. class Cats
include MongoMapper::Document
key :name, String
end

47. class Cats
include MongoMapper::Document
key :name, String
end

48. irb:001:0> Cats.create :name => 'tama'
irb:002:0> Cats.first
=> #<Cats name: "tama", _id: BSON::ObjectID('###')>
irb:003:0> Cats.create :name => 'goro', :dapple_color => ‘gray’
irb:004:0> Cats.count
=> 2
irb:005:0> Cats.first(:name => ‘goro’)
=> #<Cats name: "goro", dapple_color:”gray”,_id: ###>

49. Array, Binary, Boolean, Date, Float, Hash
Integer, Nil, ObjectId, Set, String, Time
Custom Type, and TypeLess

50. Array, Binary, Boolean, Date, Float, Hash
TypeLess
Integer, Nil, ObjectId, Set, String, Time
Custom Type, and TypeLess

51. class Storage
include MongoMapper::Document
key :value
end

52. class Storage
include MongoMapper::Document
key :value
end

53. irb:001:0> Storage.create :values => 25
irb:002:0> Storage.create :value => 'String'
irb:003:0> Cats.all
=> [#<Storage value: 25, _id: BSON::ObjectID('###')>,
#<Storage value: “String”, _id: BSON::ObjectID('###')>]

54. Array, Binary, Boolean, Date, Float, Hash
Integer, Nil, ObjectId, Set, String, Time
Custom Type, and TypeLess

56. class Family
include MongoMapper::Document
key :name, String
many :cats
end
class Cats
include MongoMapper::Document
key :name, String
key :family_id, ObjectId
belongs_to :family
end

57. class Person
include MongoMapper::Document
key :name, String
one :address
end
class Address
include MongoMapper::EmbeddedDocument
key :zipcode, String
key :street, String
end

59. • validates_presence_of :title
• validates_presence_of
• validates_length_of
• validates_format_of
• validated_numericality_of
• validates_acceptance_of
• validated_configmati

60. class Cats
include MongoMapper::Document
key :name, String
validates_presence_of :name
end

61. class Cats
include MongoMapper::Document
key :name, String, :required => true
end

62. class Cats
include MongoMapper::Document
key :name, String, :required => true
end

64. before / after

65. validate, create, save

66. class Cats
include MongoMapper::Document
key :name, String
before_validation :add_nyan
private
def add_nyan
self.name += ‘ nyan’
end
end

67. irb:001:0> Cats.create :name => 'tama'
irb:002:0> Cats.first
=> #<Cats name: "tama nyan", _id: BSON::ObjectID('###')>

70. module Charisma
def fly
puts “I’m flying”
end
end
MongoMapper::Document.
append_inclusions(Charisma)
Cats.first(:name => ‘tama’).fly

71. module Charisma
def fly
puts “I’m flying”
end
end
MongoMapper::Document.
append_inclusions(Charisma)
Cats.first(:name => ‘tama’).fly

72. • NoSQL
• MongoDB
• MongoMapper
•

73. MongoDB

74. DB
KVS RDBMS

75. MongoMapper

76. ActiveRecord
MongoDB

78. URL
• http://www.mongodb.org/
• http://www.mongodb.org/display/DOCSJP/Home
• http://wiki.github.com/jnunemaker/mongomapper/
• http://gihyo.jp/dev/serial/01/ruby/0033

79. by http://www.wanpug.com/