dmitry

  // Allows you to specify events on the data tied to the view in the same way
  // that you can specify dom events:
  //
  // dataEvents: {
  //   instanceName: {
  //     'change:name': 'mothed',
  //     delete: 'otherMethod'
  //    }, ...
  //  }
  registerDataEvents: function(unbind) {

dmitry

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

dmitry

import { Component } from "React";

export var Enhance = ComposedComponent => class extends Component {
  constructor() {
    this.state = { data: null };
  }
  componentDidMount() {
    this.setState({ data: 'Hello' });
  }
  render() {

dmitry

React now supports the use of ES6 classes as an alternative to React.createClass().

React's concept of Mixins, however, doesn't have a corollary when using ES6 classes. This left the community without an established pattern for code that both handles cross-cutting concerns and requires access to Component Life Cycle Methods.

In this gist, @sebmarkbage proposed an alternative pattern to React mixins: decorate components with a wrapping "higher order" component that handles whatever lifecycle methods it needs to and then invokes the wrapped component in its render() method, passing through props.

While a viable solution, this has a few drawbacks:

1. There's no way for the child component to override functionality defined on the higher order component.

dmitry

module FormtasticExtensions
  module Formtastic
    module TextileEditor
      
      def self.included(base)
        base.class_eval do
          @javascript_included = false
        end
      end

dmitry

class Ability
  include CanCan::Ability
  
  def initialize(user)
    user ||= User.new # guest user
    
    if user.role? :admin
      can :manage, :all
    else
      can :read, :all

dmitry

# Put this content to ~/.irbrc file (no extension)

require "rubygems"

begin
  require "ap"
rescue LoadError => err
  puts "Cannot find awesome_print gem. Please run 'gem install awesome_print' to install it."
end

dmitry

module Paperclip
  class Attachment
    
    class UploadedPath
      attr_reader :original_filename, :content_type, :size, :path
      def initialize(uploaded_file)
        @original_filename    = uploaded_file["name"].downcase
        @content_type = uploaded_file["content_type"].to_s.strip
        @file_size    = uploaded_file["size"].to_i
        @path         = uploaded_file["path"]

dmitry

# Run rake db:size to get a print of your database size in bytes.
# Run rake db:tables:size to get the sizes for individual tables
# Works for MySQL and PostgreSQL. Not tested elsewhere.

namespace :db do
  desc 'Print data size for entire database'
  task :size => :environment do

    database_name = ActiveRecord::Base.connection.instance_variable_get("@config")[:database]
    adapter = ActiveRecord::Base.connection.adapter_name.downcase

dmitry

Rails CMS alternatives
======================
  Note: project activity was checked on 11/26/09 for most of these projects, and the "last update" field has not been kept up to date since then.
  
Active projects:
---------------
adva-cms
  repo: http://github.com/svenfuchs/adva_cms/
  site: http://adva-cms.org/
  Last update: 11/24/09