Datamapper @ Railsconf2010

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

Why?

Declarative

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true
property ...

Automatic
migrations

DataMapper.auto_migrate!

DataMapper.auto_upgrade!

Storage
constraints

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true
property ...

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true
property ...

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true
property ...

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true
property ...

Automatic
validations

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true
property ...

class Person
include DataMapper::Resource
property :id, Serial
property :name, String, :required => true...

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

Convenience

"that just pisses me off"

Lazyness

people = Person.all
~ Query log empty...

people = Person.all
~ Query log empty...

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

:each

people = Person.all
people.each do |person|
p person.addresses
end

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

Complex
queries

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

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

SELECT "people"."id", "people"."name", "people"."age" FROM...

class Person
include DataMapper::Resource

...

def self.named_like_me
all(:name.like => "%me%")
end

end

class Person
include DataMapper::Resource

...

def self.named_like_me
all(:name.like => "%me%")
end

end

Per...

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

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

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

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

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

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

Not SQL centric

DataMapper.setup(:default, "postgres://postgres@localhost/dm")
DataMapper.setup(:docs, "mongo://user@localhost/dm")

class Post
include DataMapper::Resource
has n, :audits
end

class Audit
include DataMapper::Resource
def self.defa...

Custom
adapters

module DataMapper
module Adapters

class MyStorageAdapter < AbstractAdapter

def create(resources)
end

...

Future

class Address
include DataMapper::EmbeddedValue

property :street, String
end

class Person
include DataMapper...

drops into2008
Back to Rails
1.0

1.8 / 1.9
(on Windows too)

Dan Kubb

Martin Gamsjaeger

http://datamapper.org/
http://github.com/datamapper
@datamapper
http://groups.google.com/group/datamap...

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