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lulalala / friendly_inspect.rb
Created Aug 31, 2021
friendly inspect which omits long strings or complex objects
View friendly_inspect.rb
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
lulalala / personal_log.md
Created Aug 5, 2018
企劃 personal log
View personal_log.md

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
lulalala / rails_rollback_dirty_bug.rb
Last active Jan 22, 2018
Rails rollback does not revert to previous dirty state bug
View rails_rollback_dirty_bug.rb
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
lulalala / abstract.md
Last active Jan 15, 2018
abstract for RailsConf
View abstract.md

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.

View rollback_bug.rb
foo.with_lock do
# insert a
bar.with_lock do
# Mysql2::Error: Lock wait timeout exceeded
end
end
@lulalala
lulalala / gist:db650baca4a5690467894f3cf742a33b
Created Feb 23, 2017
140 characters string, which Twitter think is 18 characters too long
View gist:db650baca4a5690467894f3cf742a33b
12345678902234567890323456789042345678905234567890623456789072345678908234567890923456789002345678901234567890223456789032345678904234 t.now
@lulalala
lulalala / active_record_to_s.rb
Created Feb 21, 2017
Have ActiveRecord#to_s print out the id. More useful than printing out the Ruby object id.
View active_record_to_s.rb
class ActiveRecord::Base
def to_s
"#<#{self.class.name}:#{self.id}>"
end
end
View ruby_money_quirks.txt
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"
View testing_nothing.rb
# controller
@open_id = params[:open].to_i
# spec
expect(assigns(:open_id)).to eq(@params[:open].to_i)
View fountain_crawler.rb
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