krishicks

class Article < ActiveRecord::Base
  has_many :content_relationships, as: :origin, dependent: :destroy

  has_many :related_articles, through: :content_relationships, source: :related_content, source_type: "Article"
  has_many :related_videos,   through: :content_relationships, source: :related_content, source_type: "Video"
end

class Video < ActiveRecord::Base
  has_many :content_relationships, as: :origin, dependent: :destroy

runemadsen

Polymorphic Associations reversed

It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media

This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.

ScottPhillips

#301 Redirects for .htaccess

#Redirect a single page:
Redirect 301 /pagename.php http://www.domain.com/pagename.html

#Redirect an entire site:
Redirect 301 / http://www.domain.com/

#Redirect an entire site to a sub folder
Redirect 301 / http://www.domain.com/subfolder/

dupuy

Markdown and reStructuredText

GitHub supports several lightweight markup languages for documentation; the most popular ones (generally, not just at GitHub) are Markdown and reStructuredText. Markdown is sometimes considered easier to use, and is often preferred when the purpose is simply to generate HTML. On the other hand, reStructuredText is more extensible and powerful, with native support (not just embedded HTML) for tables, as well as things like automatic generation of tables of contents.

piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

sir-deenicus

var injectMathJax = document.createElement('script');
var typeSet = document.createElement('script');
var style=document.createElement('style');

//modified: css https://github.com/christianp/mathjax-bookmarklet/blob/master/bookmarklet.js
style.innerText = '.MathJax .mn {background: inherit;} .MathJax .mi {color: inherit;} .MathJax .mo {background: inherit;}';

injectMathJax.type = 'text/javascript';
injectMathJax.src = 'https://c328740.ssl.cf1.rackcdn.com/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML';

XVilka

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

lelandbatey

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

d1manson

# -*- coding: utf-8 -*-
import sys
from types import ModuleType, ClassType

def can_reload_methods(klass):
    klass.__CAN_RELOAD_METHODS__ = True
    return klass
    

def reloadd(m):

rubo77

#!/bin/bash
# This script rotates the screen and touchscreen input 90 degrees each time it is called, 
# also disables the touchpad, and enables the virtual keyboard accordingly

# by Ruben Barkow: https://gist.github.com/rubo77/daa262e0229f6e398766

#### configuration
# find your Touchscreen and Touchpad device with `xinput`
TouchscreenDevice='ELAN Touchscreen'
TouchpadDevice='SynPS/2 Synaptics TouchPad'