Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Why You Should Never Use an ORM
Search
John Nunemaker
PRO
May 17, 2011
Programming
54
9.1k
Why You Should Never Use an ORM
My presentation at RailsConf 2011 on thinking about your interface, your data and your code.
John Nunemaker
PRO
May 17, 2011
Tweet
Share
More Decks by John Nunemaker
See All by John Nunemaker
Atom
jnunemaker
PRO
9
4.2k
MongoDB for Analytics
jnunemaker
PRO
10
810
Addicted to Stable
jnunemaker
PRO
32
2.4k
MongoDB for Analytics
jnunemaker
PRO
21
2.2k
MongoDB for Analytics
jnunemaker
PRO
16
30k
Why NoSQL?
jnunemaker
PRO
10
900
Don't Repeat Yourself, Repeat Others
jnunemaker
PRO
7
3.3k
I Have No Talent
jnunemaker
PRO
14
920
Why MongoDB Is Awesome
jnunemaker
PRO
18
4.4k
Other Decks in Programming
See All in Programming
Go の GC の不得意な部分を克服したい
taiyow
2
760
ソフトウェアの振る舞いに着目し 複雑な要件の開発に立ち向かう
rickyban
0
890
あれやってみてー駆動から成長を加速させる / areyattemite-driven
nashiusagi
1
200
フロントエンドのディレクトリ構成どうしてる? Feature-Sliced Design 導入体験談
osakatechlab
8
4.1k
42 best practices for Symfony, a decade later
tucksaun
1
180
なまけものオバケたち -PHP 8.4 に入った新機能の紹介-
tanakahisateru
1
120
事業成長を爆速で進めてきたプロダクトエンジニアたちの成功談・失敗談
nealle
3
1.4k
良いユニットテストを書こう
mototakatsu
4
1.5k
[JAWS-UG横浜 #76] イケてるアップデートを宇宙いち早く紹介するよ!
maroon1st
0
450
今年一番支援させていただいたのは認証系サービスでした
satoshi256kbyte
1
250
Recoilを剥がしている話
kirik
5
6.6k
Security_for_introducing_eBPF
kentatada
0
110
Featured
See All Featured
GraphQLとの向き合い方2022年版
quramy
44
13k
Build your cross-platform service in a week with App Engine
jlugia
229
18k
Into the Great Unknown - MozCon
thekraken
33
1.5k
How STYLIGHT went responsive
nonsquared
95
5.2k
Bootstrapping a Software Product
garrettdimon
PRO
305
110k
Building an army of robots
kneath
302
44k
Adopting Sorbet at Scale
ufuk
73
9.1k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
127
18k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
2
160
Docker and Python
trallard
41
3.1k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
169
50k
Put a Button on it: Removing Barriers to Going Fast.
kastner
59
3.6k
Transcript
Ordered List @jnunemaker RailsConf Baltimore, MD May 17, 2011 Why
You Should Never Use an ORM
You crazy man...
None
“ Albert Einstein Any intelligent fool can make things bigger,
more complex, and more violent.
Violence My Path Of
@gem
HTTParty
HappyMapper
MongoMapper
ToyStore
None
None
Three Points
1) Interface Think About Your
1) Interface Think About Your 2) Data
1) Interface Think About Your 2) Data 3) Code
Your Interface Think About
“ John Nunemaker ORMs too often lead to interface laziness.
site.memberships.create({ :user_id => user.id, :owner => true, })
site.add_owner(user)
membership.update_attributes({ :state => 1, })
membership.update_attributes({ :state => 'maximized', })
user.maximize(site)
content.to_json({ 'a crap ton': 'of options' })
ContentPresenter.new(site, date, { :page => params['page'], }).to_json
class ContentPresenter include BasePresenter def initialize(site, date, options={}) @site, @date
= site, date @options = options end def page # ... def per_page # ... def total # ... def path # ... def prev_path # ... def next_path # ... def next_page_path # ... def prev_page_path # ... def paginated # ... def content # ...
def path # ... def prev_path # ... def next_path
# ... def next_page_path # ... def prev_page_path # ... def paginated # ... def content # ... def as_json(options = nil) { 'date' => @date.to_s, 'prev_path' => prev_path, 'next_path' => next_path, 'content' => content, 'page' => page, 'per_page' => per_page, 'total' => total, 'prev_page_path' => prev_page_path, 'next_page_path' => next_page_path, } end end
Content.paginate({ :conditions => { :site_id => site.id, :date => date,
}, :page => params['page'], :per_page => 15, })
site.content_for_date(date, { :page => params['page'], })
Your Interface Think About
Your Data Think About
“ John Nunemaker ORMs sometimes hide creative ways you can
store and retrieve your data.
Failure and Triumph A Story of
{ '_id' => 'site_id:2011-03-28', '/' => {'v' => 200, 't'
=> 'Home'}, '/about/' => {'v' => 50, 't' => 'About'}, '/foo/' => {'v' => 23, 't' => 'Foo!'}, }
You say heresy! I say use case...
None
Content.get("#{site.id}:2011-03-28")
None
write data ensure_index(site_id, date, path)
read data ensure_index(site_id, date, views)
{ '_id' => BSON::ObjectId.new, 'sid' => site_id, 'p' => '/about/',
'd' => '2011-03-28', 'v' => 50, }
NewContent.for_site_and_date(site, date)
db['c.2011.5']
db['c.2011.5'] read index write index
db['c.2011.4'] => db['c.2011.5'] read index write index
None
/about/
/this/is/my/really/long/ and/descriptive/path/and/ of/course/we/need/to/ have/a/query/string? gibberish=true&yunolikesh orturls=false#DontForgetT oHashTagIt
None
Zlib.crc32('...really long path...') 762151429
Counts Every bit
Integers
Site.create(:state => 'enabled')
class Site States = { 'enabled' => 1, 'disabled' =>
2, } end Site.create({ :state => Site::States['enabled'], })
class Site def enabled? state == States['enabled'] end def disabled?
!enabled? end end
Compression
require 'rsmaz' compressed = RSmaz.compress(str) decompressed = RSmaz.decompress(compressed)
require 'zlib' compressed = Zlib::Deflate.deflate(str) decompressed = Zlib::Inflate.inflate(compressed)
require 'msgpack' ids = [1,2,3,4,5,6,7,8,9,10] compressed = MessagePack.pack(ids) decompressed =
MessagePack.unpack(compressed)
class Stylesheet class RSmazCompressor def self.compress(str) RSmaz.compress(str) end def self.decompress(str)
RSmaz.decompress(str) end end class ZlibCompressor def self.compress(str) Zlib::Deflate.deflate(str) end def self.decompress(str) Zlib::Deflate.inflate(str) end end
Compressors = { 1 => RSmazCompressor, 2 => ZlibCompressor, }
key :compressor_id, Integer key :contents, String validates_inclusion_of :compressor_id, :within => Compressors.keys def contents value = read_attribute(:contents) compressor.decompress(value) end def compressor Compressors[compressor_id] end end
Partial Updates
site.atomic_update_attributes(attrs)
Unused Fields
Counts Where
Memory/Disk/Network
class SiteMode include Scam attr_accessor :name def password_required? id ==
2 end def item_cache? id == 1 end end
SiteMode.create({ :id => 1, :name => 'live' }) SiteMode.all #
find by id or string id pp SiteMode.find(2) pp SiteMode.find('2')
class Plan include Toy::Store store(:memory, {}) attribute(:title, String) attribute(:price, Integer)
end
class Asset plugin Joint attachment :file def page_cache(version=nil) page_cache_original page_cache_version(version)
end end
current_user.sites.map do |site| Site.get(site['id']) end
ids = current_user.sites.map do |site| site['id'] end Site.all(:_id.in => ids)
Go A Long Way A Little Ruby Can
Move
Move BigintMove
Move BigintMove MakeYouWannaMove
Move BigintMove MakeYouWannaMove DaMove
Move BigintMove MakeYouWannaMove DaMove SmoothMove
Move BigintMove MakeYouWannaMove DaMove SmoothMove NightMove
Move BigintMove MakeYouWannaMove DaMove SmoothMove NightMove DanceMove
Partition.create({ :association => :moves, :model => Move, :first_id => 1,
:writer => false, })
Partition.for_writes.model.create(...)
Partition.since(since_id, last_move_id).map do |p| send(p.association).since(since_id) end
Your Data Think About
Your Code Think About
“ No code is faster than no code.
$ bx ruby performance/reads.rb Collection#find_one 0.270231008529663 Site.first 0.69925594329834
/track - no /content - no /referrers - no /sites
- yes /users - yes
class Hit def site @site ||= begin query = {'_id'
=> site_id} options = {:fields => ['tz']} collection.find_one(query, options) end end end
write code Don’t be afraid to
read code Don’t be afraid to
fail Don’t be afraid to
Site.find(id) Site.create({ :title => 'RailsTips', }) site.update_attributes(attrs) site.to_json
Your Code Think About
“ Albert Einstein It takes a touch of genius —and
a lot of courage—to move in the opposite direction.
Ordered List Thank you!
[email protected]
John Nunemaker RailsConf Baltimore, MD
May 17, 2011 @jnunemaker