module ActiveModel # == 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. module Translation include ActiveModel::Naming # Returns the +i18n_scope+ for the class. Overwrite if you want custom lookup. def i18n_scope :activemodel end # 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. def lookup_ancestors ancestors.select { |x| x.respond_to?(:model_name) } end # 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. def human_attribute_name(attribute, options = {}) options = { count: 1 }.merge!(options) parts = attribute.to_s.split(".") attribute = parts.pop namespace = parts.join("/") unless parts.empty? attributes_scope = "#{self.i18n_scope}.attributes" if namespace defaults = lookup_ancestors.map do |klass| :"#{attributes_scope}.#{klass.model_name.i18n_key}/#{namespace}.#{attribute}" end defaults << :"#{attributes_scope}.#{namespace}.#{attribute}" else defaults = lookup_ancestors.map do |klass| :"#{attributes_scope}.#{klass.model_name.i18n_key}.#{attribute}" end end defaults << :"attributes.#{attribute}" defaults << options.delete(:default) if options[:default] defaults << attribute.humanize options[:default] = defaults I18n.translate(defaults.shift, options) end end end