DataMapper @ RubyEnRails2009

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Dirkjan Bussink
http://github.com/dbussink
http://twitter.com/dbussink

ORM?

DataMapper 0.10 is Released
DataMapper 0.10 is ready for release. We’ve worked on it
for the past 11 months, pushed 1250 c...

1.8
1.9
JRuby

Windows *
* Sorry, no Windows / 1.9 yet...

Dan Kubb

DataMapper 101

class Person
include DataMapper::Resource
property :id, Serial
property :name, String
property :age, Integer
end

DataMapper.auto_migrate!

DataMapper.auto_upgrade!

class Person

...

property :name, String, :length => 512

...

end

Person.all(:name.like => "%me%")

Ruby!

repository do
puts Person.get(1).object_id => 2232427080
puts Person.get(1).object_id => 2232427080
end

...

Pluggable
Identity Map

http://www.ﬂickr.com/photos/mattimattila

people = Person.all(:name.like => "%me%")
~ Query log empty...

p people
~ SELECT "id", "name" FROM people

:each

Kicker

people = Person.all
people.each do |person|
p person.addresses
end
SELECT "id", "name" FROM people;
SELECT "id", "street...

RDBMS
IMAP
YAML

DataMapper.setup(:repo1, "postgres://postgres@localhost/dm")
DataMapper.setup(:repo2, "mysql://root@localhost/dm")

reposi...

DataMapper.setup(:repo1, "postgres://postgres@localhost/dm")
DataMapper.setup(:repo2, "mysql://root@localhost/dm")

get "/...

module DataMapper
module Adapters

class MyStorageAdapter < AbstractAdapter

def create(resources)
end

...

Person.all(:name.like => 'dirk%').update!(:age => 28)

Person.all.destroy!(:age.gte => 100)

...

When simple
querying is
not enough

Person.all(Person.addresses.street.like => "%street%")

SELECT "people"."id", "people"."name", "people"."ag...

class Person
include DataMapper::Resource
property :id, Serial
property :name, String
property :age, Integer

ha...

class Person

s
include DataMapper::Resource

e
property :id, Serial

p
prope...

Person.all(:name.like => '%me%').addresses.all(:street.not => nil)

SELECT "id", "street", "person_id" FROM "addre...

Person.all - Person.all(:name => 'Dan Kubb')

SELECT * FROM people WHERE NOT(name = 'Dan Kubb')

[1, 2] & [2, 3] == [2]
[1, 2] | [2, 3] == [1, 2, 3]

Plugins

class Person

...

property :name, String, :nullable => false

end

CREATE TABLE "people" ("id" SERIA...

Person.create

DataObjects::IntegrityError: ERROR:
null value in column "name" violates not-null constraint

person = Person.create
p person.errors => #<DataMapper::Validate::ValidationErrors:0x101d217a0
@error...

class Person

...

validates_present :name

end

Validations

class Person

...

property :created_at, DateTime
property :updated_at, DateTime

end

Timest...

Person.all.adjust!(:age => 1)

Adjustments

class Person

...

has n, :addresses, :constraint => :destroy!

end

ALTER TABLE addresses
ADD CONSTRAINT...

module DataMapper
module Types
class IPAddress < DataMapper::Type
primitive String
length 16

...

class Address
include DataMapper::EmbeddedValue

property :street, String
end

class Person
include DataMapper...

User.select { |u| u.id == 1 && u.name == 'Dan Kubb' }

Ambition style queries

http://www.ﬂickr.com/photos/zoomar

http://datamapper.org/
http://github.com/datamapper
http://groups.google.com/group/datamapper
irc://irc.freeno...

Questions?

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