平衡点

_ n:n リレーションシップ

中間テーブルも弄りたい, とか思い始めたよ. habtm(has_and_belongs_to_many) でも行けるのかもしれないけど, has_many() + has_many(:through => ) で.

例として

• Paper には複数の Authors がいる(場合もある)
  • Authors には順番が存在している
• Author は複数の Papers を持っている(…場合もある)

こんな時. 中間テーブルとして Priorities(名前が変だが) を作成してみる. Priorities は

def self.up
  create_table(:priorities) do |t|
    t.column(:author_id, :integer)
    t.column(:paper_id, :integer)
    t.column(:priority, :integer)
  end
end

def self.down
  drop_table(:priorities)
end

みたいに作ってやる(migrate).

でもって model で

# app/models/paper.rb
class Paper < ActiveRecord::Base
  has_many(:priorities, :order => :priority)
  has_many(:authors, :through => :priorities, :order => :priority)
end

と

# app/models/author.rb
class Author < ActiveRecord::Base
  has_many(:priorities, :order => :priority)
  has_many(:papers, :through => :priorities, :order => :priority)
end

と

# app/models/priority.rb
class Priority < ActiveRecord::Base
  belongs_to(:author)
  belongs_to(:paper)
  act_as_list(:scope => :paper_id)
end

みたいな. これで複数の author に順番が作成された訳ですが. 正しく動くけど, もっと良い方法がありそうな気がする(実は中間テーブル不要, とか).

あとは登録の所でちょっとゴニョゴニョと. ToDo は dependent です.

_ 帰神

帰神って書くとなんかカコイイ(違

先日のフロンティアセミナーに引き続き, 08/02-04 で札幌行ってきました.某開発ミーティングだったのですが, 「ちょっと 9 月からは無理じゃない?」という空気が流れつつあります.

ですがきっとなんとかするのでしょう. そんな訳で 08/12-15 にまた札幌に行きます.

涼しい北海道と暑い神戸を行ったり来たりするので, 体力ががががががが

(´・ω・｀)

_ squeeze is frozen !!!

debian-devel-announce に先程流れました.

• Bits from the (chilly) release team

Current status
==============
As mentioned in the previous mail, we would freeze when various
transitions are completed or being handled. We now feel that this stage
has been reached. This means that we have stopped the automatic
migration of packages from unstable to testing.
.
In other words, Squeeze has frozen. Thanks are due to everyone who has
helped get us to this point.
.
Perhaps that's too subtle:
     _==_ _
   _,(",)|_|    *** Frosty says Squeeze is FROZEN. ***
    \/. \-|     (He's in Austrailia, as it's winter there -
  __( :  )|___  that's what the shovel is for, sandcastles)

BUG 報告したまんま直されていなくて気になるパッケージは幾つかあるんですが...

debian-annaounce にも流れました.

• Debian 6.0”Squeeze”frozen

--------------------------------------------------------------------
The Debian Project                                http://www.debian.org/
Debian 6.0 "Squeeze" frozen                             press@debian.org
August 6th, 2010                http://www.debian.org/News/2010/20100806
--------------------------------------------------------------------
.
In this very moment, during the ongoing annual Debian Developer
Conference "Debconf10" in New York, Debian's release managers have
announced a major step in the development cycle of the upcoming stable
release Debian 6.0 "Squeeze":
.
Debian "Squeeze" has now been frozen.
.
In consequence this means that no more new features will be added and
all work will now be concentrated on polishing Debian "Squeeze" to
achieve the quality Debian stable releases are known for.
.
The upcoming release will use Linux 2.6.32 as its default kernel
in the installer and on all Linux architectures.
.
New features of the upcoming release include:
 * State of the art desktop environments, based on KDE 4.4.5, Gnome
   2.30.0, LXDE 0.5.0, XFCE 4.6.2, X.org 7.5, OpenOffice.org 3.2.1
   and many other applications.
 * Stable and current versions of common server software such as
   Apache 2.2.16, PHP 5.3.2, MySQL 5.1.48, PostgreSQL 8.4.4 and Samba
   3.4.
 * Modern interpreters and compilers for all common languages such as
   Python 2.6 and 3.1, Perl 5.10, GHC 6.12 and GCC 4.4.
 * DKMS, a framework to generate Linux kernel modules whose sources
   do not reside in the Linux kernel source tree.
 * Dependency-based ordering of init scripts using insserv, allowing
   parallel execution to shorten the time needed to boot the system.

pTeXLive 間に合いませんでした(´・ω・｀).