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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 = "#{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
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