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Tatsuro Baba tbaba

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@tbaba
tbaba / paralle.js
Last active June 6, 2019 06:30
非同期の実験
const funcA = () => {
return Promise((resolve, reject) => {
resolve("funcA");
});
};
const funcB = () => {
return Promise((resolve, reject) => {
resolve("funcB");
});
@tbaba
tbaba / establish_connection.md
Last active September 7, 2018 07:55

establish_connection

  • ActiveRecord::ConnectionHandling
  • self.establish_connection
    • ここにDB名を書くと、そのテーブルだけそのDBを見に行く（らしい
    class User < ApplicationRecord
  establish_connection :hogera
end
@tbaba
tbaba / irb.rb
Created September 3, 2018 02:55
establish_connection
[4] pry(main)> User.connected?
=> false
[5] pry(main)> User
=> User (call 'User.connection' to establish a connection)
[6] pry(main)> User.connection
(0.6ms) SET NAMES utf8mb4 COLLATE utf8mb4_bin, @@SESSION.sql_mode = CONCAT(CONCAT(@@sql_mode, ',STRICT_ALL_TABLES'), ',NO_AUTO_VALUE_ON_ZERO'), @@SESSION.sql_auto_is_null = 0, @@SESSION.wait_timeout = 2147483
=> #<ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x00007fcf4c63beb0
@config=
{:adapter=>"mysql2",
:encoding=>"utf8mb4",
@tbaba
tbaba / Array#reverse
Last active July 24, 2017 08:34
def reverse!(n)
(n.length / 2).times { |i| n[-(i + 1)], n[i] = n[i], n[-(i + 1)] }
n
end
def reverse(n)
n.length.downto(1).each_with_object([]) { |i, lst| lst << n[i - 1] }
end
p reverse! [1, 2, 3, 4]
@tbaba
tbaba / file0.rb
Created July 14, 2014 03:50
DBのマイグレーション時に、changeでupとdownを表現する方法 ref: http://qiita.com/tbaba/items/3e7b62929894a0bfe4cd
class ChangeColumnTypeOfTwitterId < ActiveRecord::Migration
def change
reversible do |r|
change_table :users do |t|
r.up { t.change :twitter_id, :integer, limit: 8 }
r.down { t.change :twitter_id, :string }
end
end
end
end
@tbaba
tbaba / file0.txt
Created May 21, 2014 04:05
logrotateのファイル名に一意な値を入れたい ref: http://qiita.com/tbaba/items/76d8af798d1c138aaaf1
production.log
production.log.1
production.log.2
production.log.3
@tbaba
tbaba / course_spec.rb
Created April 11, 2014 03:34
テキストエリアの中身のテストをしたいときあるじゃん？ ref: http://qiita.com/tbaba/items/75038d857221668a8e3c
require 'spec_helper'
feature 'Course' do
describe 'new course' do
scenario '新しいコースを作成する' do
visit new_course_path
fill_in 'course_title', with: 'なんかタイトル'
# NOTE 大事なのココな
@tbaba
tbaba / file3.rb
Created March 4, 2014 02:17
ActiveRecordのdestroyでバリデーションをやりたい ref: http://qiita.com/tbaba/items/9ea139dc77443e6d7be2
if @login_provider.destroy
redirect_to user_login_providers_path, notice: '削除しました'
else
redirect_to user_login_providers_path, notice: '削除できませんでした'
end
@tbaba
tbaba / file0.txt
Created February 19, 2014 07:05
MySQLが突然の死を迎えた時の対処法 ref: http://qiita.com/tbaba/items/3fe24cffabf4e1f0c437
> show processlist;
| 284788 | tbaba | localhost:33573 | forkwell_dev | Sleep | 1 | | NULL |
| 285029 | tbaba | localhost:37715 | forkwell_dev | Query | 3595 | Waiting for table metadata lock | SELECT DISTINCT `job_endorsements`.`id` AS t0_r0, `job_endorsements`.`job_id` AS t0_r1, `job_endors |
| 285342 | tbaba | localhost:43623 | forkwell_dev | Query | 3654 | Waiting for table metadata lock | ALTER TABLE `users` DROP `facebook_identifier` |
| 285347 | tbaba | localhost:43685 | forkwell_dev | Query | 3599 | Waiting for table metadata lock | SELECT `users`.* FROM `users` WHERE `users`.`id` IN (9987, 5353, 8381, 9298, 8885, 9979, 519, 5805, |
| 285350 | tbaba | localhost:43717 | forkwell_dev | Query | 3566 | Waiting for table metadata lock | SELECT `users`.* FROM `users` WHERE `users`.`id` = 298 LIMIT 1
@tbaba
tbaba / file0.rb
Created December 24, 2013 08:10
Railsのas_jsonをもうちょっと便利に使うオプション ref: http://qiita.com/tbaba/items/ea44025b056f708ab0b4
irb(main):033:0> user = User.first
=> #<User id: 1, first_name: ‘Tatsuro’, last_name: ‘Baba’, email: ‘harakirisoul@gmail.com’>
irb(main):034:0> user.as_json
=> {"email"=>"user_1@example.com", "first_name"=>"User1", "id"=>1, "last_name"=>"USER1"}