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֎
???
Sapporo RubyKaigi 2012
@tenderlove
@takahashim
@moro
@a_matsuda
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before
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% whoami
Twitter: @a_matsuda
GitHub: amatsuda
(ʮ͋·ͭͩʯ͡Όͳͯ͘ “A. Matsuda” Ͱ͢)
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No content
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ٻਓαΠτ࡞ͬͯ·͢
ϑϦʔϥϯεͷඇৗۈऔక (Ṗ)
http://forkwell.com/
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begin
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Rails3ϨγϐϒοΫ
Λߪೖ͢Δ
օ༷͓͔࣋ͪͱࢥ͍·͕͋͢ΒͨΊͯɻ
000
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ઈࢍൃചத
શࠃͷॻళͰ
ΦϯϥΠϯͰ
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ిࢠॻ੶൛͋ΔΑʂ
http://bookpub.jp/books/bp/198
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“Entry”ͱ͍͏
Ϟσϧ໊Λආ͚Δ
ॻ੶ʹܝࡌ͍ͯͨ͠αϯϓϧίʔυʹ༻͞Εͯ
͍ͨϞσϧ໊ʹҰ෦ෆదͳͷ͕͋Γ·ͨ͠ɻ
ۘΜͰ͓ͼਃ্͛͠·͢ɻ
001
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% rails g model blog name
% rails g model entry blog:references title
body:text
Blog.has_many :entries
ॻ੶தͷαϯϓϧΞϓϦ
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% rails c
> Blog.scoped.entries
=> [#,
#, ...]
> Blog.scoped.entries.entries.entries.entries
=> [#,
#, ...]
Ṗͷݱ
શͯͷRelationʹ࠷ॳ͔Β#entries͕ੜ͑ͯΔʂʁ
ԿճͰ܁Γฦ͠ݺΔʂʁ
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Blog. rst.entries.class #=> Array
(Arrayʹݟ͑Δ͚Ͳ࣮ࡍ”Association”)
Blog. rst.entries.order(‘title’) #=> order by͞ΕΔ
(Association Proxyతͳͷͷಇ͖)
Blog#entries
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> [1, 2, 3].entries #=> [1, 2, 3]
Enumerable#entries
entries -> [object]
શͯͷཁૉΛؚΉྻΛฦ͠·͢ɻ
Relation#entries ??
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࣮ɺࣥචதʹʮEntryϚζ͍ʂʯͬͯؾ͍
ͨͷͷɺӨڹൣғ͕σΧ͗͢ΔͷͰमਖ਼Λஅ
೦…
͍͓ͪ͏αϯϓϧίʔυશ෦ͪΌΜͱಈ͘͠ɻ
ʰRails4ϨγϐϒοΫʱͰΓ·͢(ग़Ε
Ͷ…)
Rails3ϨγϐϒοΫ
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“Entry”ͱ͍͏Ϟσϧ໊Θͳ͍Α͏ʹʂ
PROTIP
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“type”͍ͬͯ͏ΧϥϜ໊
=> polymorphicؔ࿈ͱΈͳ͞Εͯڍಈෆ৹ʹͳΔ
“Task”͍ͬͯ͏Ϟσϧ໊
=> RakeͰRake::TaskͱέϯΧ͢ΔՄೳੑ
“Application”͍ͬͯ͏Ϧιʔε໊
=> ApplicationϞσϧͱ͔ApplicationsControllerͱ͔…
RailsΞϓϦࣗମͷ໊લʹকདྷϞσϧʹͳΓͦ͏ͳ໊લΛ͚ͭΔ
=> ϞσϧΛ࡞Εͳͯ͘ϋϚΔ
ϓϥάΠϯ(gem)ͷ໊લʹ୭͔͕Ϟσϧʹͦ͠͏ͳ໊લΛ͚ͭΔ
=> Ϟσϧ͕ݟ͑ͳͯ͘ࠔΔ
=> gem໊ΩϥΩϥωʔϜਪ (ʁ)
·ͩ·ͩ͋Δͧɺةͳ໊͍લ
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AssociationProxy
Λ͏
AssociationProxyͱݺΕΔ(ݺΕ͍ͯͨ)ͷʹ
͍ͭͯɺͬ͘͟Γ֓ཁΛޠΓ·͢ɻ
002
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ARͷ”association”
Ϟσϧؒͷʮؔ࿈ʯΛநԽͨ͠ͷ
#owner
#target
#loaded?
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has direction
͋ΔUserͷΠϯελϯε͕ෳͷEmailΛ࣋ͬͯ
͍Δͱ͍͏ؔ࿈Λ͋ΒΘ͢ΦϒδΣΫτ
<#User> <#Email>
has_many
<#User>#association(:emails)
owner target
by @moro
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ҰಡΜͩࢠڙΛΩϟογϡ
> user.emails.loaded? #=> false
> user.emails
SELECT "emails".* FROM "emails" WHERE "emails"."user_id" = 1
> user.emails.loaded? #=> true
> user.emails
ࠓSQL͕࣮ߦ͞Εͳ͍ʂ
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Ͳ͜ʹΩϟογϡͯ͠Δͷʁ
> user.emails.class #=> Array
> user.emails.instance_variables #=> []
> user.emails.proxy_association #=>
#,
...
@target= [#...],
...
(AR 3.2ͷ߹)
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ϝιουΛੜͨ͠ΓͰ͖Δ
class User < ActiveRecord::Base
has_many :emails do
def latest_verified
if loaded?
target.select(&:verified?).
sort_by(:updated_at).last
else
where('verified_at IS NOT NULL').
order('updated_at DESC').first
end
end
end
end
by @moro
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ϙϦϞϧϑΟοΫΞιγΤʔγϣϯɺෳछྨ
ͷΤϯςΟςΟͷؔ࿈Λɺ1ͭͷؔ࿈Ͱ͋Δ͔ͷ
Α͏ʹѻ͏ͨΊͷΞιγΤʔγϣϯͰ͢ɻ
ৄ͘͠[078] ϙϦϞʔϑΟοΫؔ࿈Λར༻͢Δ
Λݟ͍ͯͩ͘͞ɻ
(@moro)
ϙϦϞϧϑΟοΫΞιγΤʔ
γϣϯͷN+1Λճආ͢Δ
003
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ͱͯศར͕ͩ...
N+1͕ൃੜ͍͢͠ͱ͍͏ऑ͕ɻ
RDBMSతʹJOINͯ͠Ұؾʹऔͬͯ͘Δͱ͍͏͜ͱ
͕ग़དྷͳ͍ͨΊɺEager loading͑ͳ͍ɻ
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=begin
PR about us
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About me
•MOROHASHI Kyosuke
•@moro on Twitter and GitHub
•works at @esminc
•One of the authors of
Rails3 Recipe Book
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4VO4FQ
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No content
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Web built a nice "confidential" paste
service. Available in beta.
https://www.copi.pe/
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You can paste both text snippet and picture.
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=end
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Core models of copipedential
pastes
item_id:int
item_type:string
Snippet
body:text
letype_id:fk
Picture
storage_key:string
:item
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No content
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AssociationProxyΛ͏ͱɺ͜ΕΛO(2+1)ʹͰ͖·͢ɻ
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 25 LIMIT 1
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 24 LIMIT 1
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 23 LIMIT 1
SELECT "pictures".* FROM "pictures" WHERE "pictures"."id" = 37 LIMIT 1
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 22 LIMIT 1
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 21 LIMIT 1
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 19 LIMIT 1
SELECT "snippets".* FROM "snippets" WHERE "snippets"."id" = 18 LIMIT 1
SELECT "pictures".* FROM "pictures" WHERE "pictures"."id" = 38 LIMIT 1
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ϙϦϞϧϑΟοΫΞιγΤʔγϣϯɺnݸͷ௨ৗ
ͷؔ࿈ʹղͰ͖Δɻ
item_typeͰߜΓࠐΜͰ͔Βɺitem_idͰJOIN͢
ΕΑ͍ɻ
௨ৗͷؔ࿈Ͱ͋Εeager loadͰ͖Δɻ
ͦΕΛ͍͍͑Μ͡Όͳ͍͔?
جຊํ
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ϙϦϞϧϑΟοΫΞιγΤʔγϣϯɺnݸͷ௨ৗ
ͷؔ࿈ʹղͰ͖Δɻ
class Paste < ActiveRecord::Base
belongs_to :snippet,
readonly: true,
foreign_key: :item_id,
conditions: ['EXISTS(SELECT 1 FROM snippets s WHERE s.id = ?
AND pastes.item_id = s.id)', 'Snippet']
belongs_to :pictures,
readonly: true,
foreign_key: :item_id,
conditions: ['EXISTS(SELECT 1 FROM pictures s WHERE s.id = ?
AND pastes.item_id = s.id)', 'Picture']
def item
(...)
end
end
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eager loadͨ͠௨ৗͷؔ࿈ͷΦϒδΣΫτΛ͏
class Paste < ActiveRecord::Base
belongs_to :snippet, (...)
belongs_to :pictures, (...)
def item
actual_item = association(item_type.underscore.to_sym)
polymorphic_item = association(:item)
if actual_item.loaded? && !polymorphic_item.loaded?
polymorphic_item.target = actual_item.target
end
super
end
end
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͍͍ͩͨͰ͖ͨ
> Paste.limit(10).includes(:snippet, :pictures).map(&:item)
# => SELECT "pastes".* FROM "pastes" LIMIT 10
# => SELECT "snippets".* FROM "snippets" WHERE
"snippets"."id" IN (1, 2, 3, 4, 5, 6) AND (EXISTS(SELECT 1
FROM "pastes" WHERE "pastes".item_type = 'Snippet' AND
"pastes".item_id = "snippets".id))
# => SELECT "pictures".* FROM "pictures" WHERE
"pictures"."id" IN (1, 2, 3, 4, 5, 6) AND (EXISTS(SELECT 1
FROM "pastes" WHERE "pastes".item_type = 'Picture' AND
"pastes".item_id = "pictures".id))
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ͬͱίϯύΫτʹॻ͖͍ͨ!
class Paste < ActiveRecord::Base
extend EagerLoadablePolymorph
belongs_to :item, polymorphic: true
eager_loadable_polymorphic_association \
:item, [:snippet, :picture]
...
end
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ͬͱίϯύΫτʹॻ͖͍ͨ!
module EagerLoadablePolymorph
class AssociationWriter
def initialize(association, types)
raise ArgumentError, "#{association} is not polymorphic association" unless association.options[:polymorphic]
@association = association
@types = types
end
def belong_to_them(ref_from)
@types.each do |t|
ref_from.belongs_to t, readonly: true, foreign_key: fk, conditions: condition_sql(t.to_s.classify.constantize)
end
end
def define_scope(ref_from)
ref_from.scope "with_#{@association.name}", ref_from.includes(*@types)
end
def override_accessor(ref_from)
ref_from.class_eval <<-RUBY.strip_heredoc
def #{@association.name}
acutual_item = association(self[#{ft.dump}].underscore.to_sym)
polymorphic_item = association(:#{@association.name})
if acutual_item.loaded? && !polymorphic_item.loaded?
polymorphic_item.target = acutual_item.target
end
super
end
RUBY
end
private
# aliasses
def ft
@association.foreign_type
http://bit.ly/eager-loadable-polymorph
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def define_scope(ref_from)
ref_from.scope "with_#{@association.name}", re
end
def override_accessor(ref_from)
ref_from.class_eval <<-RUBY.strip_heredoc
def #{@association.name}
acutual_item = association(self[#{ft.dump}
polymorphic_item = association(:#{@associa
if acutual_item.loaded? && !polymorphic_it
polymorphic_item.target = acutual_item.t
end
super
end
RUBY
end
private
ͬͱίϯύΫτʹॻ͖͍ͨ!
http://bit.ly/eager-loadable-polymorph
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͜ͷϨγϐͷ·ͱΊ
AssociationProxyؔ࿈ϝιουʮͧ͜͜ʯͱ͍
͏ͱཱ͖ͭɻ
ϙϦϞϧϑΟοΫΞιγΤʔγϣϯͰN+1
ղܾՄೳɻཱͭɻ
(౦ژʹͬͨΒgemʹ͠·͢)
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AR::Relation#merge
Λ͍͢
AR::Relation#mergeΛͬͯRelationͬΆ͍ͷΛ
͍Ζ͍Ζmergeͯ͠Έ·͠ΐ͏ɻ
AR::Relation#mergeʹ͍ͭͯ [066] ϙϦϞʔ
ϑΟοΫؔ࿈Λར༻͢Δ Λࢀর͍ͯͩ͘͠͞ɻ
004
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class Blog < AR
scope :rails, where(name: ‘Riding Rails’)
end
class Post < AR
scope :recent, -> { where 'posts.created_at >= ?',
1.week.ago }
end
class User < AR
has_many :blogs, through: ...
end
models
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> Post.joins(:blog).recent.merge(Blog.rails)
SELECT posts.* FROM posts INNER JOIN blogs ON blogs.id =
posts.blog_id WHERE blogs.name = 'Riding Rails' AND
(posts.created_at >= '2012-09-08 03:16:03.888840')
scopeͱmerge
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> Post.joins(:blog).recent
.merge(User. rst.blogs.scoped)
SELECT posts.* FROM posts INNER JOIN blogs ON blogs.id =
posts.blog_id INNER JOIN user_blogs ON blogs.id =
user_blogs.blog_id WHERE user_blogs.user_id = 1 AND
(posts.created_at >= '2012-09-08 03:14:52.839676')
Associationͱmerge
AR 3.2Ͱඞཁ
4.0Ͱෆཁ
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whereͰαϒΫΤϦ
> Post.where(blog_id: Blog.rails)
SELECT "posts".* FROM "posts" WHERE "posts"."blog_id" IN
(SELECT "blogs"."id" FROM "blogs" WHERE "blogs"."name" = 'Riding
Rails')
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notlikeͷΫΤϦΛ
Rubyishʹهड़͢Δ
ARͰRubyͷHashΛͬͯwhere۟ΛΧοίΑ͘
ॻ͚ΔΑ͏ʹ͕ͳ͞Ε͍ͯ·͕͢ɺnotlike
͕ೖΔͱͱͨΜʹจࣈྻͰSQLΛॻ͔͞ΕΔӋ
ʹͳͬͯΨοΧϦ͠·͢ɻ
Ͳ͏ʹ͔ͳΒͳ͍ͷͰ͠ΐ͏͔ʁ
005
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ARͷwhereͷ੯͍͠ͱ͜Ζ
select * from users where name = ‘tenderlove’
<= User.where(name: ‘tenderlove’)
select * from users where name <> ‘tenderlove’
<= User.where(“name <>‘tenderlove’”)
select * from users where name like ‘tender%’
<= User.where(“name like ‘tender%’”)
RubyͷHash
SQLͦͷͷ
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A new syntax for AR4
https://github.com/rails/rails/pull/
5950#issuecomment-5591330
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not
User.where.not(name: ‘DHH’)
User.where.not(name: nil)
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like, not like
User.where.like(name: ‘John%’)
User.where.not.like(name: ‘David%’)
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ෳࡶͳΫΤϦ
User.where.not(name: nil).where.like(name:
‘Aaron%’, email: ‘tender%).where(‘age > 20’)
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A new syntax for AR4
https://github.com/rails/rails/pull/
5950#issuecomment-5591330 4 months ago...
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sprkऴΘͬͨΒPRग़͠·͢
΄Μͱ͘ͳͬͯ͢Έ·ͤΜ…
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Ұ͓ઌʹࢼ͍ͨ͠ํ
Gem le
gem ‘everywhere’
% bundle
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Twisting SQLite3
(@tenderlove)
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• Step 1: Read the API
• Step 2: Write your code
• Step 3: Annoy your friends (or profit)
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struct sqlite3_vfs {
int iVersion; /* Structure version number */
int szOsFile; /* Size of subclassed sqlite3_file */
int mxPathname; /* Maximum file pathname length */
sqlite3_vfs *pNext; /* Next registered VFS */
const char *zName; /* Name of this virtual file system */
void *pAppData; /* Pointer to application-specific data */
int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*,
int flags, int *pOutFlags);
int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir);
int (*xAccess)(sqlite3_vfs*, const char *zName, int flags, int *pResOut);
int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut);
void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename);
void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg);
void (*(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol))(void);
void (*xDlClose)(sqlite3_vfs*, void*);
int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
int (*xSleep)(sqlite3_vfs*, int microseconds);
int (*xCurrentTime)(sqlite3_vfs*, double*);
int (*xGetLastError)(sqlite3_vfs*, int, char *);
/* New fields may be appended in figure versions. The iVersion
** value will increment whenever this happens. */
};
Step 1: Read the API
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IO Hooks
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Step 2: Write our Code
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static int rbFile_close(sqlite3_file * ctx)
{
rubyFilePtr rfile = (rubyFilePtr)ctx;
VALUE file = rfile->file;
rb_funcall(file, rb_intern("close"), 0);
return SQLITE_OK;
}
Example of the hooks
we have to write
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class VFS < SQLite3::VFS
def open(name, flags)
OurFile.new(name, flags)
end
end
class OurFile
def read(...); ... end
def write(...); ... end
end
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Anything can store
a SQLite Database
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__END__ + DATA
Anything after __END__
is provided in the DATA
object.
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class EvilVFS < SQLite3::VFS
def open name, flags
DATABase.new name, flags
end
end
class DATABase < SQLite3::VFS::File
def initialize name, flags
super
@store = File.open(name, File::RDWR | File::CREAT)
@offset = 0
if File.expand_path(__FILE__) == name
@store.seek DATA.pos
@offset = DATA.pos
end
end
def close
@store.close
end
def read amt, offset
@store.seek(offset + @offset)
@store.read amt
end
def write data, offset
@store.seek(offset + @offset)
@store.write data
end
def sync opts
@store.fsync
end
def file_size
File.size(@store.path) - @offset
end
end
Stores data to after then
__END__ part
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SQLite3.vfs_register(EvilVFS.new)
db = SQLite3::Database.new(__FILE__, nil, 'EvilVFS')
db.execute(<<-eosql)
create table if not exists
users(id integer primary key, name string)
eosql
100.times {
db.execute(<<-eosql, 'tenderlove')
insert into users(name) values (?)
eosql
}
p db.execute('select count(*) from users')
__END__
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Step 3: Profit?
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No content
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Get the Code!
http://gist.github.com/319224/
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Rails consoleͷ
Ӆ͠ίϚϯυͨͪ
Rails consoleʹRailsΞϓϦ։ൃΛࢧԉ͢Δศར
ͳϝιου͕͍͔ͭ͋͘Β͔͡Ίఆٛ͞Ε͍ͯ·
͢ɻ
006
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app
> app.blogs_path #=> "/blogs"
> app.url_for(Blog. rst)
#=> "http://www.example.com/blogs/1"
> app.get('/blogs')
SELECT "blogs".* FROM "blogs"
#=> 200
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helper
> helper.link_to 'Please Login', '/login'
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reload!
ΞϓϦΛͦΕͳΓʹϦϩʔυͯ͘͠ΕΔ
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σϑΥϧτͰੵ·Ε͍ͯΔRackϛυϧΣΞͷ͏
ͪɺෆཁͳͷΛফ͢ͱύϑΥʔϚϯε͕ΊͪΌ
ΊͪΌվળͨ͠Γ͢Δ͜ͱ͕͋Γ·͢ɻ
ɹɹɹɹɹɹɹ (thanks to: @hotchpotch, @takai)
ෆཁͳRackϛυϧΣΞΛ
ͬͯϨεϙϯεΛ͘͢Δ
007
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% rake middleware
use ActionDispatch::Static
use Rack::Lock
use #
use Rack::Runtime
use Rack::MethodOverride
use ActionDispatch::RequestId
use Rails::Rack::Logger
use ActionDispatch::ShowExceptions
use ActionDispatch::DebugExceptions
use ActionDispatch::RemoteIp
use ActionDispatch::Reloader
use ActionDispatch::Callbacks
use ActiveRecord::ConnectionAdapters::ConnectionManagement
use ActiveRecord::QueryCache
use ActionDispatch::Cookies
use ActionDispatch::Session::CookieStore
use ActionDispatch::Flash
use ActionDispatch::ParamsParser
use ActionDispatch::Head
use Rack::ConditionalGet
use Rack::ETag
use ActionDispatch::BestStandardsSupport
run Test328::Application.routes
ੵ·ΕͯΔmiddlewareΛ֬ೝ
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Rails 3.2ΞϓϦͰϦΫΤετ͝ͱʹmemcached
ͷΞΫηεͷൃੜΛ؍ଌ
ڥʹΑͬͯmemcachedͰ٧·Δ
Rack::Cache͕ΫηϞϊʁ
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con g.middleware.delete 'Rack::Cache'
ͳͷͰ֎ͯ͠ΈΔ
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localhost, memcached, “hello”ͬͯݴ͏͚ͩͷ
ΞϓϦ
before
Requests per second: 355.45 [#/sec] (mean)
after
Requests per second: 381.99 [#/sec] (mean)
ࣾͰ͜Ε͚ͩͰ1.5ഒ͘Β͍͘ͳͬͨͱ͍
͏ࣄྫ
ϕϯν
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con g.middleware.delete 'Rack::ETag'
con g.middleware.delete 'Rack::ConditionalGet'
͞Βʹ৭ʑ
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localhost, memcached, “hello”ͬͯݴ͏͚ͩͷ
ΞϓϦ
before
Requests per second: 381.99 [#/sec] (mean)
after
Requests per second: 410.48 [#/sec] (mean)
ϕϯν
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APαʔόʔͰ͜ͷ͋ͨΓͷΩϟογϡΛѻΘͳ͍
ݶΓෆཁͳͣ…ͩͱࢥ͏Μ͚ͩͲͲ͏ͳΜͩ
Ζ͏ʁ
ফ͚ͩ͢Ͱ͘ͳͬͨʂ
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࣮ߦՄೳͳRakeλεΫΛදࣔ͢Δʹجຊతʹ
`rake -T`ͱ͍͏ίϚϯυΛୟ͚ྑ͍ͷͰ͕͢ɺ
RailsͰ`rake -T``rake -D`Ͱදࣔ͞Εͳ͍λεΫ
࣮݁ߏఆٛ͞Ε͍ͯͨΓ͠·͢ɻ
Ӆ͠RakeλεΫΛ
શ෦Γ͍ͨ
008
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commit 29acc17
Author: David Heinemeier Hansson
Date: 2010-06-09 16:19:03 -0400
Cut down on tasks shown in rake -T
DHHʮrake -Tݟʹ͘͘Ͷʁʯ
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Rake.application.tasks
ϩʔυ͞ΕͯΔTaskͷίϨΫγϣϯ
lib/tasks/t.rake
task :t do
puts *Rake.application.tasks.map(&:name)
end
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% rake -T | wc -l
32
% rake t | wc -l
103 (102 + 1)
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% rake t | grep db
db:_dump
db:abort_if_pending_migrations
db:charset
db:collation
db:create
db:create:all
db:drop
db:drop:all
db: xtures:identify
db: xtures:load
db:forward
db:load_con g
db:migrate
db:migrate:down
db:migrate:redo
db:migrate:reset
db:migrate:status
db:migrate:up
db:reset
db:rollback
db:schema:dump
db:schema:load
db:schema:load_if_ruby
db:seed
db:sessions:clear
db:sessions:create
db:setup
db:structure:dump
db:structure:load
db:structure:load_if_sql
db:test:clone
db:test:clone_structure
db:test:load
db:test:load_schema
db:test:load_structure
db:test:prepare
db:test:purge
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migrationͷ࡞࣮ߦΛ͍͍ͪͪखଧͪ͢Δͷͬ
ͯΊΜͲ͍͘͞͠ɺ໊લͷ͚ํͷنͳΜ͔
֮͑ͯΒΕͳ͍Ͱ͢ΑͶɻ
migrationΛ
GUIͰ࣮ߦ͢Δ
009
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Gem le
gem ‘erd’
% bundle
% open http://localhost:3000/erd
erd
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ϑϩϯτΤϯυ͕͠ΐ΅͍…
JS: @os0x
σβΠϯ: @machida
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Stay Tuned!
https://github.com/amatsuda/erd
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helperΛΦϒδΣΫτࢦ
ͬΆ͘ॻ͘
RailsͷhelperͷΠέͯͳ͞Λղফ͢Δํ๏ɻ
010
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app/helpers/*
helperϝιουʮؔʯɻRuby͡Όͳ͍ײɻ
app/helpers/user_helper.rb
# ϢʔβʔͷΞΠίϯ
def user_icon(user)
image_tag user.icon_url
end
໊લ͕μα͍ Ҿ͕μα͍
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active_decorator
Gem le
gem ‘active_decorator’
% bundle
% rails g decorator user
create app/decorators/user_decorator.rb
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user_decorator.rb
app/decorators/user_decorator.rb
module UserDecorator
def icon
image_tag icon_url
end
end
↑ͷmodule͕view_assigns࣌ʹ@userͱ͔@usersత
ͳͭʹࣗಈతʹextend͞ΕΔ
view͔Β͏ͱ͖
<%= @user.icon %>
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ؔ࿈ઌΛdecorate͍ͨ࣌͠
app/decorators/post_decorator.rb
module PostDecorator
def summary
truncate body, length: 20
end
end
app/views/entries/show.html.erb
render @entry.posts
app/views/posts/_post.html.erb
<%= post.summary %>
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ARelͷΦϒδΣΫτΛ
Rubyͷίʔυʹม͢Δ
ωλͰ͢ɻ
011
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AR::Relation#arel
> Post.scoped.arel
=> #
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ARel AST => SQL
> Post.scoped.arel.class
=> Arel::SelectManager
> puts Post.where(name: 'foo').arel.to_sql
SELECT "posts".* FROM "posts" WHERE "posts"."name" = 'foo'
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ARel AST => Ruby
> puts Post.where(name: 'foo').order('id').
offset(10).limit(5).to_ruby.to_source
select {|o| o.name == ‘foo’}.
sort_by(&:id).from(10).take(5)
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arel_ruby
https://github.com/amatsuda/arel_ruby
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usage
֎෦DBͱ͔͕͋ͬͯtestͰܨ͛ͨ͘ͳ͍߹
ʹɺRDBΛΘͣʹRuby͚ͩͰARͷ͍߹Θͤ
ʹରԠͰ͖ͯΜΓɺ͔ɻ
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RailsϨγϐϒοΫ
Λߋ৽͢Δ
ؾͷར͍ͨRails͚Ϩγϐͷ࣋ͪ߹Θ͕ͤͳ͍ͷͰɺ
Rails3ϨγϐϒοΫࣥචʹΘΕٕͨͷ͝հͰ͢ɻ
(@takahashim)
333
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ݩRailsϨγϐϒοΫ
20086݄ൃߦ
͓͔͛͞·Ͱ͝ධ
վగͯ͠Rails3൛Λ→ຊॻ
RailsϨγϐϒοΫ
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େ෯ͳՃචͭͭ͠ɺϕʔεʰRailsϨγϐ
ϒοΫʱ͔Β
Ұ෦ͷষશ໘ॻ͖͑
ʰRailsϨγϐϒοΫʱͷ൛Լ༻PDFϑΝΠϧΛ
ݩʹɺ͏ҰςΩετϑΝΠϧʹͯ͠ɺͦ͜
͔Βॻ͖͍ͯ͘͠
Rails3ϨγϐϒοΫ
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ίϐϖ
Preview.appͰPDFΛ։͘
ຊจΛίϐʔˍϖʔετͯ͠ςΩετʹ
ஔ͕͓͔͔ͬͨ͠ΒखͰ͢
PDF→ςΩετม
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ɾ͕ผͷจࣈʹ
Unicodeਖ਼نԽͷ᠘
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moro͞Μۘ
Ruby 1.9ઐ༻
EncodingΛUTF8-Mac͔ΒUTF-8ʹม
มεΫϦϓτ
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ARGV.each do |f|
File.open(f, 'r+:UTF8-MAC') do |f|
str = f.read
f.rewind
f.truncate(0)
f.set_encoding('UTF-8')
f.write(str)
end
end
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ҙ֎ʹେ׆༂
Mac OS Xൺֱత͜͏ਖ਼نԽ͢Δ͜ͱ͕ଟ͍
Preview.appɹ
ϑΝΠϧ໊ʢύε໊ʣ
ʑͷੜ׆ͷதͰ
͜ͷεΫϦϓτΛ͑Γ·͢
Ͳ͏͓͍͍ͧͩ͘͞
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Rails4ϨγϐϒοΫʁ
ʁʁʁ
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Rails3ϨγϐϒοΫ
Λߪೖ͢Δ
օ༷͓͔࣋ͪͱࢥ͍·͕͋͢ΒͨΊͯɻ
000
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EngineΛ͏
Rails EngineΛͬͨΓ࡞ͬͨΓςετͨ͠ΓϚχ
ΞοΫͳ͍ํΛͨ͠Γͯ͠Έ·͠ΐ͏ɻ
012
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جຊతͳEngineͷͭ͘Γ
ᵓᴷᴷ app
ᴹ ᵓᴷᴷ controllers
ᴹ ᴹ ᵋᴷ foo
ᴹ ᴹ ᵋᴷ bar_controller.rb
ᴹ ᵓᴷᴷ helpers
ᴹ ᴹ ᵋᴷ foo
ᴹ ᴹ ᵋᴷ bar_helper.rb
ᴹ ᵋᴷᴷ views
ᴹ ᵋᴷ foo
ᴹ ᵋᴷ bar
ᴹ ᵋᴷ index.html.erb
ᵓᴷᴷ con g
ᴹ ᵋᴷ routes.rb
ᵋᴷᴷ lib
ᵋᴷ foo
ᵋᴷ engine.rb
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isolated Engine
lib/foo/engine.rb
module Foo
class Engine < ::Rails::Engine
isolate_namespace Foo
end
end
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ΞϓϦ͔Βmount
ΞϓϦ/con g/routes.rb
mount Foo::Engine, at: ‘foo’
/foo/bar ͰEngineͷίϯτϩʔϥʔ͕ݺΔ
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EngineΛςετ͢Δ
ςετίʔυͰಈతʹRailsΞϓϦΛ࡞ͬͯmount͢Δͷָ͕
app = Class.new(Rails::Application)
app.con g.secret_token = '3b7cd727ee24e8444053437c36cc66c4'
app.con g.session_store :cookie_store, key: '_myapp_session'
app.initialize!
app.routes.draw { resources(:users) }
class User < ActiveRecord::Base; end
class ApplicationController < ActionController::Base; end
class UsersController < ApplicationController
def index
@users = User.all
render inline: ’<%= @users.map(&:name).join("\n") %>’
end
end
Object.const_set(:ApplicationHelper, Module.new)
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൚༻తͳEngine͕Ͱ͖ͨΒ
gem push͠·͠ΐ͏ʂ
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Engine gem͔ΒผͷαϒEngineΛmount͍ͨ͠
ཧ͕໘͔ͩΒGemҰͭʹ͍ͨ͠
gemspec le
Gem::Speci cation.new do |s|
s.require_paths = ['lib', 'engines/foo/lib']
end
ࢀߟ: https://github.com/amatsuda/hocus_pocus
Engine gemʹEngineΛmount
͢Δ
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end
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֎
???
Sapporo RubyKaigi 2012