Kenn Ejima kenn

Adding an audit log to your Rails app

If you have any sort of administrative interface on your web site, you can easily imagine an intruder gaining access and mucking about. How do you know the extent of the damage? Adding an audit log to your app is one quick solution. An audit log should record a few things:

controller entry points with parameter values
permanent information about the user, like user_id
transient information about the user, like IP and user_agent

Using the Rails framework, this is as simple as adding a before_action to your admin controllers. Here’s a basic version that I’m using in production.

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

UPDATE a fork of this gist has been used as a starting point for a community-maintained "awesome" list: machine-learning-with-ruby Please look here for the most up-to-date info!

Resources for Machine Learning in Ruby

Gems

liblinear-ruby: Ruby interface to LIBLINEAR using SWIG

Spurred by recent events (https://news.ycombinator.com/item?id=8244700), this is a quick set of jotted-down thoughts about the state of "Semantic" Versioning, and why we should be fighting the good fight against it.

For a long time in the history of software, version numbers indicated the relative progress and change in a given piece of software. A major release (1.x.x) was major, a minor release (x.1.x) was minor, and a patch release was just a small patch. You could evaluate a given piece of software by name + version, and get a feeling for how far away version 2.0.1 was from version 2.8.0.

But Semantic Versioning (henceforth, SemVer), as specified at http://semver.org/, changes this to prioritize a mechanistic understanding of a codebase over a human one. Any "breaking" change to the software must be accompanied with a new major version number. It's alright for robots, but bad for us.

SemVer tries to compress a huge amount of information — the nature of the change, the percentage of users that wil

Idobata Gemfile プレゼント

tl;dr IdotabaのGemfileは"全プレ"になりました。ご笑納ください。→ Gemfile

プレゼントについてのお詫び

rebuild.fmのep36でお知らせさせていただきました、Idobataの最新版Gemfileプレゼントをお届けいたします。過日はIdobata会議01への多数のご参加ありがとうございました。おかげさまで盛況なミートアップとなりました。 (当日会場を提供いただいたEngine Yardさまのブログにて、Idobata会議01当日の様子がまとめられています。ありがとうございます!)

	require 'geo_ruby/ewk'

	# NOTE: Set SRID 0 as same as mysql's default
	GeoRuby::SimpleFeatures::DEFAULT_SRID = 0

	module ActiveRecord
	module Type
	class Spatial < Value
	def type
	:spatial

	Email customers for: Successful payments - Disabled AND Receipt_email set : No receipts sent (Would send receipt in Live mode)
	Email customers for: Successful payments - Disabled AND Receipt_email not set : No receipts sent — Enable customer receipts
	Email customers for: Successful payments - Disabled AND Receipt_email not set BUT Customer email set : No receipts sent — Enable customer receipts

	Email customers for: Successful payments - Enabled AND Receipt_email set : No receipts sent (Would send receipt in Live mode)
	Email customers for: Successful payments - Enabled AND Receipt_email not set : No receipts sent — No email address for this payment
	Email customers for: Successful payments - Enabled AND Receipt_email not set BUT Customer email set : No receipts sent (Would send receipt in Live mode)

	#!/bin/bash
	## Fix OneDrive for Mac CPU usage
	##
	## Seems this is still a problem 5 years later after I created this little gist.
	## I have long since stopped using OneDrive (luckily), but according to
	## comments below, I have added the new path for OfficeFileCache for macOS
	## Mojave (10.14) and Catalina (10.15).

	## Run this on macOS Mojave (10.14) and Catalina (10.15)
	find ~/Library/Containers/ -type d -name OfficeFileCache -exec rm -r {} +

	require "net/http"

	def start_server
	# Remove the X to enable the parameters for tuning.
	# These are the default values as of Ruby 2.2.0.
	@child = spawn(<<-EOC.split.join(" "))
	XRUBY_GC_HEAP_FREE_SLOTS=4096
	XRUBY_GC_HEAP_INIT_SLOTS=10000
	XRUBY_GC_HEAP_GROWTH_FACTOR=1.8
	XRUBY_GC_HEAP_GROWTH_MAX_SLOTS=0

	#import <Foundation/Foundation.h>

	@interface NSObject (AssociatedDictionary)

	+ (NSMutableDictionary*)associatedDictionary;
	- (NSMutableDictionary*)associatedDictionary;

	@end