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rails--rails/activemodel/lib/active_model/naming.rb

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require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/module/introspection'
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module ActiveModel
class Name
include Comparable
attr_reader :singular, :plural, :element, :collection,
:singular_route_key, :route_key, :param_key, :i18n_key,
:name
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alias_method :cache_key, :collection
##
# :method: ==
#
# :call-seq:
# ==(other)
#
# Equivalent to <tt>String#==</tt>. Returns +true+ if the class name and
# +other+ are equal, otherwise +false+.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name == 'BlogPost' # => true
# BlogPost.model_name == 'Blog Post' # => false
##
# :method: ===
#
# :call-seq:
# ===(other)
#
# Equivalent to <tt>#==</tt>.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name === 'BlogPost' # => true
# BlogPost.model_name === 'Blog Post' # => false
##
# :method: <=>
#
# :call-seq:
# ==(other)
#
# Equivalent to <tt>String#<=></tt>.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name <=> 'BlogPost' # => 0
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# BlogPost.model_name <=> 'Blog' # => 1
# BlogPost.model_name <=> 'BlogPosts' # => -1
##
# :method: =~
#
# :call-seq:
# =~(regexp)
#
# Equivalent to <tt>String#=~</tt>. Match the class name against the given
# regexp. Returns the position where the match starts or +nil+ if there is
# no match.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name =~ /Post/ # => 4
# BlogPost.model_name =~ /\d/ # => nil
##
# :method: !~
#
# :call-seq:
# !~(regexp)
#
# Equivalent to <tt>String#!~</tt>. Match the class name against the given
# regexp. Returns +true+ if there is no match, otherwise +false+.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name !~ /Post/ # => false
# BlogPost.model_name !~ /\d/ # => true
##
# :method: eql?
#
# :call-seq:
# eql?(other)
#
# Equivalent to <tt>String#eql?</tt>. Returns +true+ if the class name and
# +other+ have the same length and content, otherwise +false+.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name.eql?('BlogPost') # => true
# BlogPost.model_name.eql?('Blog Post') # => false
##
# :method: to_s
#
# :call-seq:
# to_s()
#
# Returns the class name.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# BlogPost.model_name.to_s # => "BlogPost"
##
# :method: to_str
#
# :call-seq:
# to_str()
#
# Equivalent to +to_s+.
delegate :==, :===, :<=>, :=~, :"!~", :eql?, :to_s,
:to_str, to: :name
# Returns a new ActiveModel::Name instance. By default, the +namespace+
# and +name+ option will take the namespace and name of the given class
# respectively.
#
# module Foo
# class Bar
# end
# end
#
# ActiveModel::Name.new(Foo::Bar).to_s
# # => "Foo::Bar"
def initialize(klass, namespace = nil, name = nil)
@name = name || klass.name
raise ArgumentError, "Class name cannot be blank. You need to supply a name argument when anonymous class given" if @name.blank?
@unnamespaced = @name.sub(/^#{namespace.name}::/, '') if namespace
@klass = klass
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@singular = _singularize(@name)
@plural = ActiveSupport::Inflector.pluralize(@singular)
@element = ActiveSupport::Inflector.underscore(ActiveSupport::Inflector.demodulize(@name))
@human = ActiveSupport::Inflector.humanize(@element)
@collection = ActiveSupport::Inflector.tableize(@name)
@param_key = (namespace ? _singularize(@unnamespaced) : @singular)
@i18n_key = @name.underscore.to_sym
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@route_key = (namespace ? ActiveSupport::Inflector.pluralize(@param_key) : @plural.dup)
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@singular_route_key = ActiveSupport::Inflector.singularize(@route_key)
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@route_key << "_index" if @plural == @singular
end
# Transform the model name into a more humane format, using I18n. By default,
# it will underscore then humanize the class name.
#
# class BlogPost
# extend ActiveModel::Naming
# end
#
# 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
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def _singularize(string, replacement='_')
ActiveSupport::Inflector.underscore(string).tr('/', replacement)
end
end
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# == Active \Model \Naming
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#
# Creates a +model_name+ method on your object.
#
# To implement, just extend ActiveModel::Naming in your object:
#
# class BookCover
Adds #key and #to_param to the AMo interface This commit introduces two new methods that every AMo compliant object must implement. Below are the default implementations along with the implied interface contract. # Returns an Enumerable of all (primary) key # attributes or nil if new_record? is true def key new_record? ? nil : [1] end # Returns a string representing the object's key # suitable for use in URLs, or nil if new_record? # is true def to_param key ? key.first.to_s : nil end 1) The #key method Previously rails' record_identifier code, which is used in the #dom_id helper, relied on calling #id on the record to provide a reasonable DOM id. Now with rails3 being all ORM agnostic, it's not safe anymore to assume that every record ever will have an #id as its primary key attribute. Having a #key method available on every AMo object means that #dom_id can be implemented using record.to_model.key # instead of record.id Using this we're able to take composite primary keys into account (e.g. available in datamapper) by implementing #dom_id using a newly added record_key_for_dom_id(record) method. The user can overwrite this method to provide customized versions of the object's key used in #dom_id. Also, dealing with more complex keys that can contain arbitrary strings, means that we need to make sure that we only provide DOM ids that are valid according to the spec. For this reason, this patch sends the key provided through a newly added sanitize_dom_id(candidate_id) method, that makes sure we only produce valid HTML The reason to not just add #dom_id to the AMo interface was that it feels like providing a DOM id should not be a model concern. Adding #dom_id to the AMo interface would force these concern on the model, while it's better left to be implemented in a helper. Now one could say the same is true for #to_param, and actually I think that it doesn't really fit into the model either, but it's used in AR and it's a main part of integrating into the rails router. This is different from #dom_id which is only used in view helpers and can be implemented on top of a semantically more meaningful method like #key. 2) The #to_param method Since the rails router relies on #to_param to be present, AR::Base implements it and returns the id by default, allowing the user to overwrite the method if desired. Now with different ORMs integrating into rails, every ORM railtie needs to implement it's own #to_param implementation while already providing code to be AMo compliant. Since the whole point of AMo compliance seems to be to integrate any ORM seamlessly into rails, it seems fair that all we really need to do as another ORM, is to be AMo compliant. By including #to_param into the official interface, we can make sure that this code can be centralized in the various AMo compliance layers, and not be added separately by every ORM railtie. 3) All specs pass
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# extend ActiveModel::Naming
# end
#
# BookCover.model_name.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"
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#
# 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.
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module Naming
def self.extended(base) #:nodoc:
base.class_eval do
remove_possible_method(:model_name)
delegate :model_name, to: :class
end
end
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# Returns an ActiveModel::Name object for module. It can be
# used to retrieve all kinds of naming-related information
# (See ActiveModel::Name for more information).
#
# class Person
# include ActiveModel::Model
# end
#
# Person.model_name.name # => "Person"
# Person.model_name.class # => ActiveModel::Name
# Person.model_name.singular # => "person"
# Person.model_name.plural # => "people"
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def model_name
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@_model_name ||= begin
namespace = self.parents.detect do |n|
n.respond_to?(:use_relative_model_naming?) && n.use_relative_model_naming?
end
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ActiveModel::Name.new(self, namespace)
end
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end
# Returns the plural class name of a record or class.
#
# 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.
#
# 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.
#
# 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
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# Returns string to use while generating route names. It differs for
# namespaced models regarding whether it's inside isolated engine.
#
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# # For isolated engine:
# ActiveModel::Naming.singular_route_key(Blog::Post) # => "post"
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#
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# # For shared engine:
# ActiveModel::Naming.singular_route_key(Blog::Post) # => "blog_post"
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def self.singular_route_key(record_or_class)
model_name_from_record_or_class(record_or_class).singular_route_key
end
# Returns string to use while generating route names. It differs for
# namespaced models regarding whether it's inside isolated engine.
#
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# # For isolated engine:
# ActiveModel::Naming.route_key(Blog::Post) # => "posts"
#
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# # For shared engine:
# ActiveModel::Naming.route_key(Blog::Post) # => "blog_posts"
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#
# The route key also considers if the noun is uncountable and, in
# such cases, automatically appends _index.
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.
#
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# # For isolated engine:
# ActiveModel::Naming.param_key(Blog::Post) # => "post"
#
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# # 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
def self.model_name_from_record_or_class(record_or_class) #:nodoc:
if record_or_class.respond_to?(:model_name)
record_or_class.model_name
elsif record_or_class.respond_to?(:to_model)
record_or_class.to_model.class.model_name
else
record_or_class.class.model_name
end
end
private_class_method :model_name_from_record_or_class
end
end