dmitry

# Redefines const value during block execution.
#
# Usage example:
#   SOMECONST = 1     # SOMECONST == 1
#   redefine_const(:SOMECONST, 'hello') do
#     puts SOMECONST  # SOMECONST == 'hello'
#   end
#                     # SOMECONST == 1
def redefine_const(const, value, &block)
  if const_defined = Object.const_defined?(const)

dmitry

Creating a Multi Page Form in Rails

Creating a multi-step wizard-like form is pretty difficult in Rails. 
Especially when trying to apply REST and validations. There are many 
different approaches to this problem, and the right one depends largely 
on your application details. Here are four options, and then my final 
recommendation. Skip to that if you're in a hurry.

1. Create the model at the beginning on the first page of the form, and 
have each successive page update the model. Validations are tricky 

dmitry

jQuery.fn.extend({
  // options: width: integer, height: integer, image: string - absolute url path
  // example: $("input[type='file']").stylizeFileInput({width: 79, height: 22, image: '/images/file_button.gif'});
  stylizeFileInput: function(options) {
    return this.each(function(){
      var el = $(this);
      var div = $('<div>');
      div.css('width', options.width);
      div.css('height', options.height);
      div.css('background', 'url(' + options.image + ') 0 0 no-repeat');

dmitry

jQuery.fn.extend({
  // upload file through iframe, without refreshing the page, must be wrapped by form
  // jquery.timers dependent
  // $("input[type='file']").iframeFileUpload({blank_pathname: '/my_blank_file.html', autoSubmit: true, onStart: function(el){}, onStop(el){}});
  iframeFileUpload: function(options) {
    return this.each(function(){
      var blank_pathname = options.blank_pathname || '/blank.html';
      var el = $(this);
      var form = el.parents('form');
      var iframe_id = 'iframe_' + form.attr('id');

dmitry

jQuery.extend({
  // Example: console.log(jQuery.chainSelect('search_location', locations_object, {levels: ['continent', 'country', 'region', 'city', 'suburb']}));
  chainSelect: function(id, json, options) {
    this._findValue = function(value, result) {
      for (k in this.json) {
        var v = this.json[k];
        
        if (k == value) {
          result.unshift(k);
          result = this._findValue.apply(this, [v[options.fields.parent_id], result]);

dmitry

var _that = this;
jQuery.extend({
  someFunction: function(onSomeEvent) {
    var variable = 'some text';
    onSomeEvent.apply(_that); // how to pass current scope variables/functions to this function?
    return null;

    function _someMethod(arg) {
      console.log(arg);
    }

dmitry

before "deploy:rollback:revision", "deploy:rollback_database"

  desc "Rolls back database to migration level of the previously deployed release"
  task :rollback_database, :roles => :db, :only => { :primary => true } do
    if releases.length < 2
      abort "could not rollback the code because there is no prior release"
    else
      rake = fetch(:rake, "rake")
      rails_env = fetch(:rails_env, "production")
      migrate_env = fetch(:migrate_env, "")

dmitry

  desc "Moves files to a new :path NB! backup your files before use this task (set CLASS and PATH, ATTACHMENT is optional)"
  task :change_path => :environment do
    raise 'PATH must be specified, like PATH=:rails_root/public/system/:class/:attachment/:style/:id.:extension' if ENV['PATH'].blank?
    path = ENV['PATH']
    for_all_attachments do |instance, name|
      object = instance.send(name)
      old_path = object.instance_variable_get :'@path'
      
      styles = [:original] + object.styles.keys
      

dmitry

  self.include_root_in_json = false

  def export
    json = to_json(:include => [:door_profile, :door_lift, :door_hinge, :door_handle, :door_glass], :except => [:created_at, :updated_at, :door_id, :id, :order_id, :user_id])
    attributes = ActiveSupport::JSON.decode(json)
    %w[door_profile door_lift door_hinge door_handle door_glass].each do |v|
      if attributes[v]
        attributes["#{v.to_s}_attributes"] = attributes[v]
        attributes.delete(v)
      end

dmitry

set :sync_directories, ["assets", "galleries"]
set :sync_backups, 3