esdras

module Main where

import Signal


type alias Message =
    { operation : String
    , message : String
    }

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# add to fix issue with mysql 7+
# https://github.com/rails/rails/pull/13247#issuecomment-158787912
# http://stackoverflow.com/questions/21075515/creating-tables-and-problems-with-primary-key-in-rails
class ActiveRecord::ConnectionAdapters::Mysql2Adapter

  NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY"

  alias :connect_no_sql_mode :connect
  def connect
    connect_no_sql_mode

esdras

Getting started with Webpack, TypeScript, Babel and React

Introduction

The Javascript world is full of buzzwords, there is four only in the title of this article. With all these tools coming and going so fast, it's tuff to keep up the pace. I'm a ruby developer and recently I felt the need to improve my productivity in frontend development. With rails we have the asset pipeline but it seems that the javascript world has better tools to offer. While I was doing my research I stumbled upon these tools and started to see the values they bring, hopefully those values will be clear to you at the end of this article.

If you're like me and are not familiar with these tools, it can be daunting to get started. There is so much to learn and it's tempting to go back and just use jQuery. I made this tutorial because I myself wanted to learn. This tutorial will help you to implement a hello world app using these tools.

esdras

#!/bin/bash
# from here: http://www.codingsteps.com/install-redis-2-6-on-amazon-ec2-linux-ami-or-centos/
# and here: https://raw.github.com/gist/257849/9f1e627e0b7dbe68882fa2b7bdb1b2b263522004/redis-server
###############################################
# To use: 
# wget https://gist.githubusercontent.com/esdras/5d1f13fa37073ce23f3f/raw/install-redis.sh
# chmod 777 install-redis.sh
# ./install-redis.sh
###############################################
echo "*****************************************"

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module Cache
  def write_fragment(key, content, options = nil)
    return content unless cache_configured?
    key = fragment_key(key)
    content = content.to_str
    fragments_to_write << key
    fragments_to_write << ActiveSupport::Gzip.compress(content)
    content
  end
  

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CREATE OR REPLACE FUNCTION hash_password() RETURNS trigger AS
$$

  if(TG_OP == 'INSERT' || OLD.encrypted_password != NEW.encrypted_password) {

    if(NEW.encrypted_password == null) throw new Error('password cannot be null');

    if(NEW.encrypted_password.length < 8 || NEW.encrypted_password.length > 72) {
      throw new Error('password length must be beteween 8 and 72');
    }

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CREATE OR REPLACE FUNCTION hash_password_on_insert() RETURNS trigger AS
$FUNCTION$
BEGIN

  IF NEW.encrypted_password IS NULL THEN
    RAISE EXCEPTION 'password cannot be null';
  END IF;

  IF char_length(NEW.encrypted_password) < 8 THEN
    RAISE EXCEPTION 'password is to short, should be greater than 8 chars';

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CREATE OR REPLACE FUNCTION hash_password_on_insert() RETURNS trigger AS
$FUNCTION$
BEGIN

  IF NEW.encrypted_password IS NULL THEN
    RAISE EXCEPTION 'password cannot be null';
  END IF;

  IF char_length(NEW.encrypted_password) < 8 THEN
    RAISE EXCEPTION 'password is to short, should be greater than 8 chars';

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Validação para cartão de crédito.

Bin e padrões para validação de cartão de crédito.

Bandeira	Começa com	Máximo de número	Máximo de número cvc
Visa	4	13,16	3
Mastercard	5	16	3

esdras

class CreateTransactionsInvoicesTriggers < ActiveRecord::Migration

  def up

    add_column :credit_card_invoices, :balance_cents, :integer, null: false, default: 0 rescue nil

    execute <<-SQL
      DROP TRIGGER IF EXISTS update_invoice_after_create_transaction;
    SQL