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How to deploy a Django app with PostgreSQL + Gunicorn + Nginx using pyenv on Ubuntu Server 16.04

This guide shows how to setup a production environment for a Django application using PostgreSQL as database, Gunicorn as application server and Nginx as http server using Ubuntu Server 14.04 as Operative System.

Install PosgreSQL, Nginx, Git and Circus

Install PostgreSQL and Nginx using:

sudo apt-get install -y postgresql-9.5 postgresql-contrib-9.5 postgresql-server-dev-9.5 nginx git circus make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils python-setuptools 

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# /app/helpers/devise_helper.rb

module DeviseHelper
  def devise_error_messages!
    return '' if resource.errors.empty?

    messages = resource.errors.full_messages.map { |msg| content_tag(:li, msg) }.join
    sentence = I18n.t('errors.messages.not_saved',
      count: resource.errors.count,
      resource: resource.class.model_name.human.downcase)

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// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

// MIT license

(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];

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# app / controllers / application_controller.rb
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  before_filter :configure_permitted_parameters, if: :devise_controller?

  protected

    def configure_permitted_parameters

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inputs = %w[
  CollectionSelectInput
  DateTimeInput
  FileInput
  GroupedCollectionSelectInput
  NumericInput
  PasswordInput
  RangeInput
  StringInput
  TextInput

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# http://stackoverflow.com/questions/14972253/simpleform-default-input-class
# https://github.com/plataformatec/simple_form/issues/316

inputs = %w[
  CollectionSelectInput
  DateTimeInput
  FileInput
  GroupedCollectionSelectInput
  NumericInput
  PasswordInput