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require 'active_support/inflector'
require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/module/introspection'
module ActiveModel
class Name < String
attr_reader :singular, :plural, :element, :collection, :partial_path, :route_key, :param_key, :i18n_key
alias_method :cache_key, :collection
def initialize(klass, namespace = nil)
super(klass.name)
@unnamespaced = self.sub(/^#{namespace.name}::/, '') if namespace
@klass = klass
@singular = _singularize(self).freeze
@plural = ActiveSupport::Inflector.pluralize(@singular).freeze
@element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(self)).freeze
@human = ActiveSupport::Inflector.humanize(@element).freeze
@collection = ActiveSupport::Inflector.tableize(self).freeze
@partial_path = "#{@collection}/#{@element}".freeze
@param_key = (namespace ? _singularize(@unnamespaced) : @singular).freeze
@route_key = (namespace ? ActiveSupport::Inflector.pluralize(@param_key) : @plural).freeze
@i18n_key = self.underscore.to_sym
end
# Transform the model name into a more humane format, using I18n. By default,
# it will underscore then humanize the class name
#
# BlogPost.model_name.human # => "Blog post"
#
# Specify +options+ with additional translating options.
def human(options={})
return @human unless @klass.respond_to?(:lookup_ancestors) &&
@klass.respond_to?(:i18n_scope)
defaults = @klass.lookup_ancestors.map do |klass|
klass.model_name.i18n_key
end
defaults << options[:default] if options[:default]
defaults << @human
options = {:scope => [@klass.i18n_scope, :models], :count => 1, :default => defaults}.merge(options.except(:default))
I18n.translate(defaults.shift, options)
end
private
def _singularize(string, replacement='_')
ActiveSupport::Inflector.underscore(string).tr('/', replacement)
end
end
# == Active Model Naming
#
# Creates a +model_name+ method on your object.
#
# To implement, just extend ActiveModel::Naming in your object:
#
# class BookCover
# extend ActiveModel::Naming
# end
#
# BookCover.model_name # => "BookCover"
# BookCover.model_name.human # => "Book cover"
#
# BookCover.model_name.i18n_key # => "book_cover"
# BookModule::BookCover.model_name.i18n_key # => "book_module.book_cover"
#
# Providing the functionality that ActiveModel::Naming provides in your object
# is required to pass the Active Model Lint test. So either extending the provided
# method below, or rolling your own is required.
module Naming
# Returns an ActiveModel::Name object for module. It can be
# used to retrieve all kinds of naming-related information.
def model_name
@_model_name ||= begin
namespace = self.parents.detect { |n| n.respond_to?(:_railtie) }
ActiveModel::Name.new(self, namespace)
end
end
# Returns the plural class name of a record or class. Examples:
#
# ActiveModel::Naming.plural(post) # => "posts"
# ActiveModel::Naming.plural(Highrise::Person) # => "highrise_people"
def self.plural(record_or_class)
model_name_from_record_or_class(record_or_class).plural
end
# Returns the singular class name of a record or class. Examples:
#
# ActiveModel::Naming.singular(post) # => "post"
# ActiveModel::Naming.singular(Highrise::Person) # => "highrise_person"
def self.singular(record_or_class)
model_name_from_record_or_class(record_or_class).singular
end
# Identifies whether the class name of a record or class is uncountable. Examples:
#
# ActiveModel::Naming.uncountable?(Sheep) # => true
# ActiveModel::Naming.uncountable?(Post) => false
def self.uncountable?(record_or_class)
plural(record_or_class) == singular(record_or_class)
end
# Returns string to use while generating route names. It differs for
# namespaced models regarding whether it's inside isolated engine.
#
# For isolated engine:
# ActiveModel::Naming.route_key(Blog::Post) #=> posts
#
# For shared engine:
# ActiveModel::Naming.route_key(Blog::Post) #=> blog_posts
def self.route_key(record_or_class)
model_name_from_record_or_class(record_or_class).route_key
end
# Returns string to use for params names. It differs for
# namespaced models regarding whether it's inside isolated engine.
#
# For isolated engine:
# ActiveModel::Naming.param_key(Blog::Post) #=> post
#
# For shared engine:
# ActiveModel::Naming.param_key(Blog::Post) #=> blog_post
def self.param_key(record_or_class)
model_name_from_record_or_class(record_or_class).param_key
end
private
def self.model_name_from_record_or_class(record_or_class)
(record_or_class.is_a?(Class) ? record_or_class : convert_to_model(record_or_class).class).model_name
end
def self.convert_to_model(object)
object.respond_to?(:to_model) ? object.to_model : object
end
end
end
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