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How to install PhantomJS on Ubuntu

Version: 1.9.8

Platform: x86_64

First, install or update to the latest system software.

sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev

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pick d0d13d0    1:removed some bullshit from __entrypoint.d      _________9______
pick a44e878    2:Improvements to object.d and __entrypoint.d    ________89______
pick 12c5b47    3:Add usage to build.d                           ___3____________
pick 318af43    4:Added .gitignore                               ______________e_
pick eb9ad0f    5:Attempting to add more array support           _1_3_56_89abcd__
pick 8b8df05    6:Added some special support for ldc to object.d ________8_______
pick e630300    7:Removed imports from build                     ___3____________
pick 69ae673    8:c-main to d-main                               __2345_7_9______
pick c00b344    9:Implemented write an exit system calls         _1_345678_______
pick 3901cca   10:Add wscript_build file                         0__3____________

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# Borrowed from https://github.com/y310/rspec-retry/blob/master/lib/rspec/retry.rb

CAPYBARA_TIMEOUT_RETRIES = 3

RSpec.configure do |config|
  config.around(:each, type: :feature) do |ex|
    example = RSpec.current_example
    CAPYBARA_TIMEOUT_RETRIES.times do |i|
      example.instance_variable_set('@exception', nil)
      self.instance_variable_set('@__memoized', nil) # clear let variables

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There is a bug in PhantomJS on Mac OS X that doesn't render an HTML page as selectable text. It will be fixed in PhantomJS 2.0, so for now you'll have to apply a patch when installing with Homebrew.

First, update homebrew formulae:

$ brew update

If you already have PhantomJS installed, then remove it:

$ brew uninstall phantomjs Next, the PhantomJS formula needs to be edited to apply a patch that fixes native text rendering in Mac OS X:

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Finding a Ruby memory leak using a time analysis

When developing a program in Ruby, you may sometimes encounter a memory leak. For a while now, Ruby has a facility to gather information about what objects are laying around: ObjectSpace.

There are several approaches one can take to debug a leak. This discusses a time-based approach, where a full memory dump is generated every, say, 5 minutes, during a time that the memory leak is showing up. Afterwards, one can look at all the objects, and find out which ones are staying around, causing the

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defmodule RestClient do 
  require Logger
  alias Poison, as: JSON

  @baseurl "http://someapi.com"
  @username "username"
  @password "password"

  def get_by_path(path, id, params)
    when is_binary(id) or is_integer(id) and is_list(params) do

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#!/bin/sh
#

if [ "X$SSH_AUTH_SOCK" = "X" ]; then
    eval `ssh-agent -s`
    ssh-add $HOME/.ssh/id_rsa
fi

HOST=
REDIS_SLAVE_PORT=6000

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FROM elixir:1.2.3
MAINTAINER Sergey Gernyak <sergeg1990@gmail.com>

ENV MIX_ENV=prod

RUN apt-get update && apt-get install -y build-essential git-core

RUN mkdir -p /app

WORKDIR /app

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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.

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package demo

import io.vertx.core.Vertx
import io.vertx.core.http.HttpServer
import io.vertx.core.http.HttpServerResponse
import io.vertx.ext.web.Route
import io.vertx.ext.web.Router
import io.vertx.ext.web.RoutingContext

fun Router.get(path: String, handler: (RoutingContext) -> Unit): Route {