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I18n date/number parsing/localization - RMU Project
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README.md

I18nAlchemy

I18n date/number parsing/localization

I18nAlchemy aims to handle date, time and number parsing, based on current I18n locale format. The main idea is to have ORMs, such as ActiveRecord for now, to automatically accept dates/numbers given in the current locale format, and return these values localized as well.

Why

Almost all projects I've been working so far required some sort of input using dates and numbers, and it has always been a pain due to lack of this support in ActiveRecord itself. As I do most of my projects using different date/number formats than the English defaults (I live in Brazil), we've been adopting different ways to handle that in each application.

I've already used the delocalize gem in some of these projects, and validates_timeliness parser in others, and both work pretty well actually. But I think it might work a bit different than delocalize, and mainly, I wanted to learn more about I18n and ActiveRecord internals.

Usage

I18nAlchemy is pretty straigthforward to use, you just need to include it in your ActiveRecord model. Lets say we are working with a Product model:

class Product < ActiveRecord::Base
  include I18n::Alchemy
end

By mixing the module into your model, you get the localized method:

@product   = Product.first
@localized = @product.localized

Here are some examples on how to use it with numeric values:

@localized.price = "1.99"

@product.price   # => 1.99
@localized.price # => "1.99"

I18n.with_locale :pt do
  @localized.price = "1,88"

  @product.price   # => 1.88
  @localized.price # => "1,88"
end

Please notice that the localized proxy also formats your numeric values based on the current precision in your I18n locale file:

@product.price = 1.3
@localized.price # => "1.30", considering a precision of 2

And with thousand separators as well:

@product.price = 1840.32
@localized.price # => "1,840.32", considering separator = "," and delimiter = "."

Some examples with date / time objects:

@localized.released_at = "12/31/2011"

@product.released_at   # => Date.new(2011, 12, 31)
@localized.released_at # => "12/31/2011"

I18n.with_locale :pt do
  @localized.released_at = "31/12/2011"

  @product.released_at   # => Date.new(2011, 12, 31)
  @localized.released_at # => "31/12/2011"
end

The localized method quacks like ActiveRecord: you can give a hash of attributes and extra options if you want, and it will delegate everything to the object, parsing the attributes before:

# This will parse the attributes in the given hash.
I18n.with_locale :pt do
  @localized = @product.localized(:price => "1,88")

  @product.price   # => 1.88
  @localized.price # => "1,88"
end

I18n configuration

Right now the lib uses the same configuration for numeric, date and time values from Rails:

en:

  date:
    formats:
      default: "%m/%d/%Y"

  time:
    formats:
      default: "%m/%d/%Y %H:%M:%S"

  number:
    format:
      separator: '.'
      delimiter: ','
      precision: 2

Please notice the default date and time format is considered for input values for now, and it will only accept valid values matching these formats. We plan to add specific formats and to parse a list of possible input formats for I18nAlchemy, to make it more flexible, please refer to TODO file for more info.

Contact

Carlos Antonio da Silva (http://github.com/carlosantoniodasilva)

License

MIT License.

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