| ### Show stack trace for 500 errors | |
| ### (adapted from https://gist.github.com/1079020) | |
| # Given an application, yield to a block to handle exceptions | |
| class ExceptionRaiserApp | |
| def initialize(app) | |
| @app = app | |
| end | |
| def call(env) |
| #!/usr/bin/env ruby | |
| # List all keys stored in memcache. | |
| # Credit to Graham King at http://www.darkcoding.net/software/memcached-list-all-keys/ for the original article on how to get the data from memcache in the first place. | |
| require 'net/telnet' | |
| headings = %w(id expires bytes cache_key) | |
| rows = [] |
| class Api::RegistrationsController < Api::BaseController | |
| respond_to :json | |
| def create | |
| user = User.new(params[:user]) | |
| if user.save | |
| render :json=> user.as_json(:auth_token=>user.authentication_token, :email=>user.email), :status=>201 | |
| return | |
| else |
| # Parses YouTube URLs directly or from iframe code. Handles: | |
| # * Address bar on YouTube url (ex: http://www.youtube.com/watch?v=ZFqlHhCNBOI) | |
| # * Direct http://youtu.be/ url (ex: http://youtu.be/ZFqlHhCNBOI) | |
| # * Full iframe embed code (ex: <iframe src="http://www.youtube.com/embed/ZFqlHhCNBOI">) | |
| # * Old <object> tag embed code (ex: <object><param name="movie" value="http://www.youtube.com/v/ZFqlHhCNBOI">...) | |
| /(youtu\.be\/|youtube\.com\/(watch\?(.*&)?v=|(embed|v)\/))([^\?&"'>]+)/ | |
| $5 #=> the video ID | |
| # test it on Rubular: http://rubular.com/r/eaJeSMkJvo |
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.
APIs are becoming an essential feature of modern web applications. Rails does a good job of helping your application provide an API using the same MVC structure you're accustomed to.
Let's work with the following example controller:
class ArticlesController < ApplicationController
| backend default { | |
| .host = "127.0.0.1"; | |
| .port = "3000"; | |
| } | |
| acl admin { | |
| "127.0.0.1"; | |
| } | |
| sub vcl_recv { |
| images = Dir.glob('public/images/*') | |
| images.each do |image| | |
| unless File.directory?(image) | |
| puts "Checking #{image}..." | |
| if IO.popen("ack-grep -1 -G '(app|public)' --ruby --html --css #{File.basename(image)}").eof? | |
| IO.popen("svn delete #{image}") | |
| puts " Deleted" | |
| end | |
| end |
| # create the template | |
| template = PageOfflineTemplate.new | |
| template.quote = quote | |
| template.pages = quote.build_pages | |
| # Here I render a template with layout to a string then a PDF | |
| pdf = PDFKit.new template.render_to_string(:template=>"quotes/review.html.haml") | |
| for f in `find . -regex '.*\.html\.erb'`; do echo "Converting $f" && html2haml $f > "${f%.erb}.haml" && rm $f; done |