lulalala

    def inspect
      result = instance_variables.each
        .with_object({}) { |name, h| h[name] = instance_variable_get(name) }
        .reject { |name, value| value.nil? }
        .map { |name, value|
          case value
          when true, false, Symbol, Numeric, Array, Hash
            "#{name}=#{value.inspect}"
          when String
            if value.length > 80

lulalala

前言

軟體工程師都很能理解營運一個網站，完善的 log 系統是不可或缺的。 除了在發生錯誤時能用來除錯以外，也能透過資料分析來當作各項指標， 進行科學的自我改善。

同樣的，一個人生活中，紀錄不也有同樣的好處嗎？ 有了紀錄，可以查詢到上次感冒是什麼時候， 新的習慣養成是否成功，生活上有什麼大小改變等等。

lulalala

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

lulalala

There are many use cases where the ActiveModel::Errors interface is tedious to use, such message formatting and testing. This talk presents these cases, and explains why the limitation can be simply solved by taking an object-oriented approach, which results in the AdequateErrors gem. The gem's implementation is explained, and the talk will showcase examples on how it can make your coding life easier.

lulalala

foo.with_lock do
  # insert a
  bar.with_lock do
    # Mysql2::Error: Lock wait timeout exceeded
  end
end

lulalala

12345678902234567890323456789042345678905234567890623456789072345678908234567890923456789002345678901234567890223456789032345678904234 t.now

lulalala

class ActiveRecord::Base
  def to_s
    "#<#{self.class.name}:#{self.id}>"
  end
end

lulalala

irb(main):016:0> Money.new(1.5) == 0.015.to_money
=> true
irb(main):017:0> Money.new(1.5).instance_variable_get(:@fractional).to_s
=> "1.5"
irb(main):018:0> 0.015.to_money.instance_variable_get(:@fractional).to_s
=> "2.0"

lulalala

# controller
@open_id = params[:open].to_i

# spec
expect(assigns(:open_id)).to eq(@params[:open].to_i)

lulalala

require 'nokogiri'
require 'open-uri'

(1..91).each do |i|
  f = Fountain.create(issue:i, title:i)
end

(1..91).each do |i|
  f = Fountain.find_by(issue:i)
  i_s = "%02d" % i