How to Translate JavaScript Strings in Rails


Rails I18n and elegant message passing to JavaScript

The process of “internationalization” usually means to abstract all strings and other locale specific bits (such as date or currency formats) out of your application. The process of “localization” means to provide translations and localized formats for these bits.

How I18n in Ruby on Rails Works

The limits of my language are the limits of my world. ‒Ludwig Wittgenstein. With over 6,909 distinct languages in the world and most of them differing in so many different ways (e.g. in pluralization rules), it is difficult to provide specific tools for internalization. However, for unrestricted barriers of languages, Rails I18n API focuses on:

  • providing support for English and similar languages out of the box
  • making it easy to customize and extend everything for other languages

As part of this solution, every static string in the Rails framework – e.g. Active Record validation messages, time and date formats – has been internationalized, so localization of a Rails application means “over-riding” these defaults.

Read more on RailsCarma Blog

How to Add Functionality to Ruby Classes with Decorators


How to Add Functionality to Ruby Classes with Decorators

Decorators allow us to add behavior to objects in runtime and don’t affect other objects of the class. Decorators can be applied when you need to dynamically add and remove responsibility to a class. The decorator pattern is a helpful alternative to creating sub-classes. They give additional functionality to a class while still keeping the public API consistent. Let’s look at an example to understand the importance of Ruby Decorators.

consider we have a Tattoo class with a price method that returns 300.

Class Tattoo
def price
300
end
end

Now we will add an extra color as a feature, and the price would be increased by 150

The simplest way is to create a TattooWithColour subclass that returns 450 in the price method.

class TattooWithColour < Tattoo
def price
450
end
end

Next, we need to represent a big tattoo that adds 200 to the price of our tattoos. We can represent this using a BigTattoo subclass of Tattoo.

class BigTattoo < Tattoo
def price
500
end
end

We could also have bigger sized tattoos and they may add further price to our BigTattoo. If we were to consider that these tattoos types could be used with colours, we would need to add BigTattooWithColour and BiggerTattooWithColour subclasses.

With this method, we end up with total of 6 classes. Even Double that the number if you want to represent these combinations with extra designs on tattoo.

Read full article at RailsCarma Blog.