Adam Gavlák adamgavlak

Validations

Data integrity is an underrated part of proper application architecture. Many of the bugs in production systems are triggered by missing or malformed user data. If a user can possibly screw it up or screw with it, they will. Validations in the model can help!

On Syntax

Before we begin, let's talk about syntax. There are two primary syntaxes for writing validations in Rails 3:

validates_presence_of :price

	// found here http://forums.shopify.com/categories/2/posts/29259

	var getOrdinal = function(n) {
	var s=["th","st","nd","rd"],
	v=n%100;
	return n+(s[(v-20)%10]\|\|s[v]\|\|s[0]);
	}

	// $*-color are sass variables defined elsewhere
	$brands: (bandcamp $bandcamp-color) (twitter $twitter-color) (facebook $facebook-color) (foobar $foobar-color)

	@each $brand in $brands

	$klass: nth($brand, 1)
	$kolor: nth($brand, 2)
	//@debug "brand class is #{$klass} and color is #{$kolor}"

	//

	# config/routes.rb
	resources :documents do
	scope module: 'documents' do
	resources :versions do
	post :restore, on: :member
	end

	resource :lock
	end
	end

	#!/bin/bash

	set -e

	CURRENT_NAME="CurentName"
	CURRENT_OTP="current_name"

	NEW_NAME="NewName"
	NEW_OTP="new_name"

	defmodule MyApp.Scheduler do
	@moduledoc """
	Schedules a Mix task to be run at a given interval in milliseconds.

	## Options

	- `:task`: The name of the Mix task to run.
	- `:args`: A list of arguments to pass to the Mix task's `run/1` function.
	- `:interval`: The time interval in millisconds to rerun the task.

	<!DOCTYPE html>
	<html prefix="og: http://ogp.me/ns#">

	<head>
	<!-- content-type, which overrides http equivalent header. Because of charset, this meta should be set at first. -->
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
	<!-- Overrides http equivalent header. This tells IE to use the most updated engine. -->
	<meta http-equiv="X-UA-Compatible" content="IE=Edge">
	<!-- Tells crawlers how to crawl this page, and the role of this page. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta -->
	<meta name="robots" content="index, follow">

	# Creating a Digital Ocean droplet running Rails + Postgres with persistant storage and https
	#--------------------------------------------------------------------------------------------

	# For your ctrl-D pleasure...
	# SERVER_IP
	# APP_NAME
	# RAILS_SECRET (generate with `rails secret`)
	# ADMIN_EMAIL

	class SiteConstraint
	def matches?(request)
	request.subdomain != 'my' && request.domain != 'localhost'
	end
	end

	class AppConstraint
	def matches?(request)
	request.subdomain === 'my' \|\| request.domain == 'localhost'
	end