skozz

- Add `gem 'tzinfo-data'` to the Gemfile. 
- Add `tzdata` to the Dockerfile
```
RUN apk update \
    && apk add build-base \
       tzdata
```
- Build `docker-compose build` or `docker-compose up --build`
- Enjoy the life

wvengen

Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

vendethiel

module QueryTrace
  def self.enable!
    ::ActiveRecord::LogSubscriber.send(:include, self)
  end

  def self.append_features(klass)
    super
    klass.class_eval do
      unless method_defined?(:log_info_without_trace)
        alias_method :log_info_without_trace, :sql

jurisgalang

[jgalang@rashomon:~/Code/skunkworks/2fa]
∴ ruby totp_demo.rb

Time(sec)  	Time (UTC format)	Value of T(Hex) 	TOTP    	Mode  	OK
------------------------------------------------------------------------------------------
59         	1970-01-01 00:00:59	0000000000000001	94287082	SHA1  	 ✔
59         	1970-01-01 00:00:59	0000000000000001	46119246	SHA256	 ✔
59         	1970-01-01 00:00:59	0000000000000001	90693936	SHA512	 ✔
1111111109 	2005-03-18 01:58:29	00000000023523EC	07081804	SHA1  	 ✔
1111111109 	2005-03-18 01:58:29	00000000023523EC	68084774	SHA256	 ✔

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

tagrudev

# Do not refactor, it is a bad practice. YOLO

# Not understanding why or how something works is always good. YOLO

# Do not ever test your code yourself, just ask. YOLO

# No one is going to read your code, at any point don't comment. YOLO

# Why do it the easy way when you can reinvent the wheel? Future-proofing is for pussies. YOLO

masarakki

config.filter_parameters += [:password, lambda {|k, v|
   if k.to_sym == :json
     json = JSON.parse(v).symbolize_keys
     json[:password] = "[FILTERED]" if json.has_key?(:password)
     v.replace json.to_s
   end
}]

mperham

class ActiveRecord::Base
  mattr_accessor :shared_connection
  @@shared_connection = nil

  def self.connection
    @@shared_connection || ConnectionPool::Wrapper.new(:size => 1) { retrieve_connection }
  end
end
ActiveRecord::Base.shared_connection = ActiveRecord::Base.connection

josevalim

# In your test_helper.rb
class ActiveRecord::Base
  mattr_accessor :shared_connection
  @@shared_connection = nil

  def self.connection
    @@shared_connection || retrieve_connection
  end
end