Note The maintenance mode is enabled on all application server as soon as the file /public/system/maintenance.html is present. Installation
Note This card does not reflect the current state of lazy loading technologies. The native lazy attribute could be used...
A list of common computer I/O actions and how long they take. Visual comparison chart: http://i.imgur.com/k0t1e.png
Now that CarrierWave is no longer maintained, Shrine might be worth a look.
The asset pipeline is one of Rails' two mechanisms how stylesheets, javascripts and images from your /assets folder are processed...
Writing ruby methods that accept both optional and keyword arguments is dangerous and should be avoided. This confusing behavior will...
When working with PostgreSQL, you can use pgAdmin as a GUI. While you can do most things just like on...
Bash stores the exitcodestatus of piped commands in the environment variable PIPESTATUS So you can just echo ${PIPESTATUS[@]} to get...
All browsers + IE9 know the CSS :empty selector. It lets you hide an element when it has no content, i.e...
Looking for a way to embed raster images for both low- and high-DPI displays, this developer had some good...
We've already learned how to integrate user-provided images uploads to our application in 205 basic file uploads and...
Read the following material: World's shortest UI/UX design course 7 Rules for Creating Gorgeous UI (Part 1)
Ruby has Enumerable.find(&block), which returns the first item in the collection for which the block evaluates to true.
Learn to store attachments in a way that is accessible by authorized users only Learn to prevent users from...
Understand how asynchronous JavaScript works: Read Henning's presentation about asynchronous Javascript (there's also a German video presentation...
Exercise 1: Maps In MovieDB, add a new field “Principal filming location”. In a movie’s show view, geocode that...
To change RAM size, VDISK size or VCPU count of an openstack instance you have to use nova resize. You...
Learn to treat files as an ActiveRecord attribute type, like :string or :integer Research Look at the README for...
Understand at least the following CSS concepts: Classes Selecting elements for styling Basic styling (color, typography, spacing)
Rails is our web framework. Goals Be able to write a simple Rails application. Understand how Rails talks to the...
Small web application where you can upload an image (PNG, JPEG, GIF) and generate a base64-encoded version of it...
Surprisingly exhaustive new icon set by Google. Available as PNG, SVG and as a icon font. Comment from Henning
Note: Making a reverse proxy with nginx is much more straightforward. A reverse proxy is a "man in the middle...
# Given the following models class Image < ActiveRecord::Base has_many :album_images has_many :albums, through: :album_images