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@lulalala
lulalala / banner.rb
Last active January 14, 2019 12:58 — forked from matheusvetor/banner.rb
Carrierwave image model validation on image dimensions/height/width.
class Banner < ActiveRecord::Base
attr_accessor :image_width, :image_height
mount_uploader :image, ImageUploader
validate :check_dimensions, :on => :create
def check_dimensions
if !image_cache.nil? && (image.width < 300 || image.height < 300)
errors.add :image, "Dimension too small."
end
end
@willurd
willurd / web-servers.md
Last active May 16, 2025 10:42
Big list of http static server one-liners

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
@0xGGGGG
0xGGGGG / pgsql_workflow.sh
Last active January 21, 2016 13:28
postgres install and develop applications on MAC OSX with rails
# first install pgsql with home brew
brew install postgresql
# at this point, you need to be sure you have /usr/local/bin before /usr/bin on your $PATH
# to see, run:
brew doctor
# if doctor does not complain about this issue you can pass this step.
# prepend /usr/local/bin to your PATH in your ~/.bash_profile
@caniszczyk
caniszczyk / clone-all-twitter-github-repos.sh
Created October 9, 2012 04:25
Clone all repos from a GitHub organization
curl -s https://api.github.com/orgs/twitter/repos?per_page=200 | ruby -rubygems -e 'require "json"; JSON.load(STDIN.read).each { |repo| %x[git clone #{repo["ssh_url"]} ]}'
@rgreenjr
rgreenjr / postgres_queries_and_commands.sql
Last active May 14, 2025 00:29
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
@ramn
ramn / webrick_and_erb.rb
Created September 1, 2012 10:50
Simple ruby webserver
require 'webrick'
require 'erb'
template = <<TEMPLATE
<html>
<head>
<title>Ruby as PHP</title>
</head>
<body>
<h1>Loop</h1>
@jonjaques
jonjaques / bookmarklet.js
Last active May 5, 2024 21:07
jQuery Bookmarklet Template w/ Async Loading
// You create your bookmarklet by instantiating
// a new Bookmarklet function, then pass in the options like so.
// This example checks to see if the var is already defined, and makes
// sure not to overwrite it. This could happen if the user clicks on
// the bookmarklet more than once.
MyBookmarklet = MyBookmarklet || (MyBookmarklet = new Bookmarklet({
// debug: true, // use debug to bust the cache on your resources
css: ['/my/style.css'],
js: [],
@padde
padde / chained-comparison.rb
Created April 20, 2012 15:45
chained comparison in Ruby
# Chained comparisons in Ruby
# inspired by http://coffeescript.org/#comparisons
# as well as http://refactormycode.com/codes/1284
[:<, :>, :<=, :>=].each do |operator|
[Float, Fixnum, Rational, Comparable].each do |klass|
klass.class_eval do
alias_method "_#{operator}", operator
define_method operator do |rhs|
send("_#{operator}", rhs) && rhs
@btoone
btoone / curl.md
Last active December 8, 2024 05:16
A curl tutorial using GitHub's API

Introduction

An introduction to curl using GitHub's API.

The Basics

Makes a basic GET request to the specifed URI

curl https://api.github.com/users/caspyin
@cslarsen
cslarsen / euler_phi.cpp
Created January 18, 2012 20:16
Euler's totient function phi --- a fast implementation in C++
/*
* Euler's totient function phi(n).
* http://en.wikipedia.org/wiki/Euler%27s_totient_function
*
* This is an *EXTREMELY* fast function and uses
* several tricks to recurse.
*
* It assumes you have a list of primes and a fast
* isprime() function. Typically, you use a bitset
* to implement the sieve of Eratosthenes and use