iCoreTech Research Labs

I opened up a little github repository to store italian language files for Rails’ recently integrated I18n gem.

You can find the files at http://github.com/masterkain/rails-i18n-italian-language/tree/master 

Finally it’s here

#before
@user = User.find_by_uuid(params[:uuid]) || raise(ActiveRecord::RecordNotFound)
# after
@user = User.find_by_uuid!(params[:uuid])

I’m happy again.

ruby -vrrexml/rexml -e 'p REXML::VERSION,PLATFORM'

http://www.ruby-lang.org/en/news/2008/08/23/dos-vulnerability-in-rexml/

Grab column names for a model with magic fields and primary key stripped out

>> Dictionary.content_columns.collect { |col| col.name }
=> ["it", "en"]
# or
>> Dictionary.content_columns.map(&:name)
=> ["it", "en"]

Get an ActiveRecord Model attributes

>> Dictionary.first.attributes
=> {"it"=>"ciao", "id"=>1, "en"=>"hello"}

Discover which column yields the data you’re looking for

>> Dictionary.first.attributes.index("hello")
=> "en"

Take out some given keys from an Hash easily

# I think rails should need a method similar to content_columns and attributes_names but for extracting content_values
>> Dictionary.first.attributes.except("id")
=> {"it"=>"ciao", "en"=>"hello"}

Remove all whitespace on both ends of a string, change multiple spaces into one

" foo   bar    \n   \t   boo".squish # => "foo bar boo"

Manage repetitive find conditions via a Hash

# Basic
>> Model.find(:all, :conditions => ['first_name LIKE :name OR last_name LIKE :name', {:name => "aname"}])
# Extended example
# available_languages is a method which returns an Array.
>> word = "hello"
>> conditions = [ Dictionary.available_languages.collect { |language_column| language_column + ' = :word' }.join(" OR "), { :word => word } ]
>> Dictionary.find(:first, :conditions => conditions)

Not really a rails feature but you can append methods to the "end" block

    query_string_array.inject('') do |string_so_far, current_word|
      string_so_far + ' ' + lookup_word_and_build_translation_string(current_word)
    end.squish

Returns an array with the names of the subclasses of a class

# This works in production mode or development with config.cache_classes =  true or when classes are loaded
>> Account.send(:subclasses).map { |o| o.to_s } # this is protected in AR
# or
>> Object.subclasses_of(Account).map { |o| o.to_s }

Build up a sentence from an array taking advantage of the new I18n rails adapter, without last comma

# This will also use the "connector" word you defined in your language, default for en-US is "and".
>> %w(a b c).to_sentence(:skip_last_comma => true)
=> "a, b and c"
# Add in your language file:

  # Used in array.to_sentence.
  support:
    array:
      sentence_connector: "e"

There’s a ton of other stuff, just browse Active Support files to find much more useful and time-saving extensions. Now go refactor your code and make it even more prettier :)

Previously this would have committed the transaction but not carried out save or destroy operation.

The entire callback chain of a save, save!, or destroy call runs within a transaction. That includes after_*hooks. If everything goes fine a COMMIT is executed once the chain has been completed.

If a before_* callback cancels the action a ROLLBACK is issued. You can also trigger a ROLLBACK raising an exception in any of the callbacks, including after_* hooks.

Note, however, that in that case the client needs to be aware of it because an ordinary save will raise such exception instead of quietly returning false.

link to changeset

FAT32 formatted drives can not handle unix permissions at all.

You can not do chown, chmod or any of that stuff. In particular, if a file was locked in windows, it will be read as having an immutable flag in OS X. The only way to change it is by mounting the drive in windows.

You must open a dos window from inside windows and type:

attrib -r -s c:\foldername

and hit enter.

If you have long folder names or ones with spaces in the name it gets a little tricky guessing at the dos name equivilant ~1 etc. If you can’t get the dos name on any folders then rename the folder to a 8 letter name first then run the attrib command. Afterwards when you boot back into leopard, the locked check marks will be gone.

From pperret http://discussions.apple.com/thread.jspa?messageID=7090349

one hour ago a changeset changed how i18n in rails edge behaves, the main feature, apart some bug fixes, are that the language files can be in yaml.

it-IT:
  activerecord:
    errors:
      # The values :model, :attribute and :value are always available for interpolation
      # The value :count is available when applicable. Can be used for pluralization.
      messages:
        inclusion: "non è incluso nella lista"
        exclusion: "è riservato"
        invalid: "è invalido"
        confirmation: "non coincide con la conferma"
        accepted: "deve essere accettata"
        empty: "non può essere vuoto"
        blank: "non può essere vuoto"
        too_long: "è troppo lungo (il massimo è {{count}} lettere)"
        too_short: "è troppo corto (il minimo è {{count}} lettere)"
        wrong_length: "è della lunghezza sbagliata (deve essere di {{count}} lettere)"
        taken: "è già in uso"
        not_a_number: "non è un numero"
        greater_than: "deve essere superiore a {{count}}"
        greater_than_or_equal_to: "deve essere superiore o uguale a {{count}}"
        equal_to: "deve essere uguale a {{count}}"
        less_than: "deve essere meno di {{count}}"
        less_than_or_equal_to: "deve essere meno o uguale a {{count}}"
        odd: "deve essere dispari"
        even: "deve essere pari"
        # Append your own errors here or at the model/attributes scope.
        can_only_contain_letters_and_numbers: "può contenere solo lettere e numeri"
        can_t_be_blank_or_is_not_valid: "non può essere vuoto o non valido"

      models:
        # Overrides default messages

      attributes:
        # Overrides model and default messages.

class ApplicationController < ActionController::Base
  before_filter :set_locale
  private
  # Sets the locale for the current request.
  def set_locale
    # I18n.default_locale returns the current default locale. Defaults to 'en-US'
    locale = params[:locale] || session[:locale] || (this_user.site_language if is_logged_in?) || I18n.default_locale
    # TODO: insert a conditional check there to make sure be choose a valid supported locale.
    session[:locale] = locale

    # Sets the current locale pseudo-globally, i.e. in the Thread.current hash.
    I18n.locale = locale
    # Allow client libraries to pass a block that populates the translation
    # storage. Decoupled for backends like a db backend that persist their
    # translations, so the backend can decide whether/when to yield or not.
    I18n.populate do
      # Allows client libraries to pass arguments that specify a source for
      # translation data to be loaded by the backend. The backend defines
      # acceptable sources.
      # E.g. the provided SimpleBackend accepts a list of paths to translation
      # files which are either named *.rb and contain plain Ruby Hashes or are
      # named *.yml and contain YAML data.)
      I18n.load_translations "lib/locale/#{locale}.yml"
    end
  end

Meanwhile I’m waiting for some fixes to be tossed in into rails core (YAML files instead of ruby for example), here’s how to translate your active record error message in rails edge using the new i18n framework.

 

I18n.backend.store_translations "it-IT", {
  :active_record => {
    :error_messages => {
      :inclusion => "non è incluso nella lista",
      :exclusion => "è riservato",
      :invalid => "è invalido",
      :confirmation => "non coincide con la conferma",
      :accepted  => "deve essere accettata",
      :empty => "non può essere vuoto",
      :blank => "non può essere vuoto",
      :too_long => "è troppo lungo (il massimo è {{count}} lettere)",
      :too_short => "è troppo corto (il minimo è {{count}} lettere)",
      :wrong_length => "è della lunghezza sbagliata (deve essere di {{count}} lettere)",
      :taken => "è già in uso",
      :not_a_number => "non è un numero",
      :greater_than => "deve essere superiore a {{count}}",
      :greater_than_or_equal_to => "deve essere superiore o uguale a {{count}}",
      :equal_to => "deve essere uguale a {{count}}",
      :less_than => "deve essere meno di {{count}}",
      :less_than_or_equal_to => "deve essere meno o uguale a {{count}}",
      :odd => "deve essere dispari",
      :even => "deve essere pari",
      :can_only_contain_letters_and_numbers => "può contenere solo lettere e numeri"
    }
  },
  :yes => "sì",
  :no => "no"
}

Custom validation message example:

  validates_format_of :username, :with => /^\w+$/i, :message => :can_only_contain_letters_and_numbers

Hi everyone,

sorry for not updating those pages during these days but I’m having a little holiday in Malta, I’ll be back blogging around 16/17 August.