Active Model Translation

Provides integration between your object and the Rails internationalization (i18n) framework.

A minimal implementation could be:

class TranslatedPerson
  extend ActiveModel::Translation
end

TranslatedPerson.human_attribute_name('my_attribute')
# => "My attribute"

This also provides the required class methods for hooking into the Rails internationalization API, including being able to define a class based i18n_scope and lookup_ancestors to find translations in parent classes.

Methods
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Included Modules
Instance Public methods
human_attribute_name(attribute, options = {})

Transforms attribute names into a more human format, such as “First name” instead of “first_name”.

Person.human_attribute_name("first_name") # => "First name"

Specify options with additional translating options.

# File activemodel/lib/active_model/translation.rb, line 45
def human_attribute_name(attribute, options = {})
  defaults = lookup_ancestors.map do |klass|
    :"#{self.i18n_scope}.attributes.#{klass.model_name.i18n_key}.#{attribute}"
  end

  defaults << :"attributes.#{attribute}"
  defaults << options.delete(:default) if options[:default]
  defaults << attribute.to_s.humanize

  options.reverse_merge! :count => 1, :default => defaults
  I18n.translate(defaults.shift, options)
end
i18n_scope()

Returns the i18n_scope for the class. Overwrite if you want custom lookup.

# File activemodel/lib/active_model/translation.rb, line 27
def i18n_scope
  :activemodel
end
lookup_ancestors()

When localizing a string, it goes through the lookup returned by this method, which is used in ActiveModel::Name#human, ActiveModel::Errors#full_messages and ActiveModel::Translation#human_attribute_name.

# File activemodel/lib/active_model/translation.rb, line 35
def lookup_ancestors
  self.ancestors.select { |x| x.respond_to?(:model_name) }
end