Aitor García Rey aitor

Optimistic Locking assumes that a database transaction conflict is very rare to happen. It uses a version number of the record to track the changes. It raise an error when other user tries to update the record while it is lock.

usage

Just add a lock_version column to the table you want to place the lock and Rails will automatically check this column before updating the record.

Pessimistic locking assumes that database transaction conflict is very likely to happen. It locks the record until the transaction is done. If the record is currently lock and the other user make a transaction, that second transaction will wait until the lock in first transaction is release.

usage

[SLACKNAME] Code of Conduct

Welcome!

[BRIEF DESCRIPTION OF THE SLACK AND ITS PURPOSE]

The current admins are:

[NAMES]

Using `<details>` in GitHub

Suppose you're opening an issue and there's a lot noisey logs that may be useful.

Rather than wrecking readability, wrap it in a <details> tag!

<details>
 Summary Goes Here

1 - Download the RDS certificates (root plus region-specific intermediate ones) bundle:

wget -O config/rds-combined-ca-bundle.pem https://s3.amazonaws.com/rds-downloads/rds-combined-ca-bundle.pem

2 - Add config/rds-combined-ca-bundle.pem to the repository and redeploy to Heroku.

3 - Update the DATABASE_URL env var:

How many times shouldn't it happen...

-- https://news.ycombinator.com/item?id=11396045

SELECT count(*)
FROM (SELECT id, repo_name, path
        FROM [bigquery-public-data:github_repos.sample_files]
 ) AS F

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>Deep-Insights.js \| Highest Mountains</title>
	<link rel="shortcut icon" href="http://cartodb.com/assets/favicon.ico" />
	<meta name=viewport content="width=device-width initial-scale=1">
	<link rel="stylesheet" href="http://libs.cartocdn.com/di.js/v0/themes/css/deep-insights.css" />
	<script src=" http://libs.cartocdn.com/di.js/v0/deep-insights.uncompressed.js"></script>
	<style type="text/css">

	# usage: combine-tracks.sh input.mov output.mov
	#
	# I've been using this ffmpeg command to take recordings made with ecamm's Call Recorder for Skype and uploading them
	# to YouTube for transcription. I found that YouTube would only transcribe one of the audio channels which
	# was often my own voice, which made it less than useful, to put it mildly. Once the channels are combined YouTube will
	# transcribe both sides of the conversation. I also found that it was useful to adjust the volumes of the tracks.

	ffmpeg -i $1 -filter_complex "[0:a:0]volume=0.781250[a1];[0:a:1]volume=0.781250[a2]; [a1][a2]amerge[out]" -map 0:v -map "[out]" -c:v copy -shortest $2

	class MoveAttachmentsToNewLocation < ActiveRecord::Migration
	def initialize(name = self.class.name, version = nil)
	access_key = Rails.application.secrets.g3_access_key_id
	secret_key = Rails.application.secrets.g3_secret_access_key
	storage = Fog::Storage::Google.new google_storage_access_key_id: access_key,
	google_storage_secret_access_key: secret_key

	@bucket_name = Rails.application.secrets.g3_bucket
	@bucket = storage.directories.get(@bucket_name)
	super(name, version)

	gem 'jwt', '~> 1.5.0'
	gem 'warden', '~> 1.2.0'