# module ActiveModel::Naming

## 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.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.

### Public Class Methods

param_key(record_or_class) click to toggle source

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"

    # File lib/active_model/naming.rb, line 303
    def self.param_key(record_or_class)
      model_name_from_record_or_class(record_or_class).param_key
    end

plural(record_or_class) click to toggle source

Returns the plural class name of a record or class.

    ActiveModel::Naming.plural(post)             # => "posts"
    ActiveModel::Naming.plural(Highrise::Person) # => "highrise_people"

    # File lib/active_model/naming.rb, line 248
    def self.plural(record_or_class)
      model_name_from_record_or_class(record_or_class).plural
    end

route_key(record_or_class) click to toggle source

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"

The route key also considers if the noun is uncountable and, in such cases, automatically appends _index.

    # File lib/active_model/naming.rb, line 291
    def self.route_key(record_or_class)
      model_name_from_record_or_class(record_or_class).route_key
    end

singular(record_or_class) click to toggle source

Returns the singular class name of a record or class.

    ActiveModel::Naming.singular(post)             # => "post"
    ActiveModel::Naming.singular(Highrise::Person) # => "highrise_person"

    # File lib/active_model/naming.rb, line 256
    def self.singular(record_or_class)
      model_name_from_record_or_class(record_or_class).singular
    end

singular_route_key(record_or_class) click to toggle source

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.singular_route_key(Blog::Post) # => "post"

    # For shared engine:
    ActiveModel::Naming.singular_route_key(Blog::Post) # => "blog_post"

    # File lib/active_model/naming.rb, line 276
    def self.singular_route_key(record_or_class)
      model_name_from_record_or_class(record_or_class).singular_route_key
    end

uncountable?(record_or_class) click to toggle source

Identifies whether the class name of a record or class is uncountable.

    ActiveModel::Naming.uncountable?(Sheep) # => true
    ActiveModel::Naming.uncountable?(Post)  # => false

    # File lib/active_model/naming.rb, line 264
    def self.uncountable?(record_or_class)
      plural(record_or_class) == singular(record_or_class)
    end

### Public Instance Methods

model_name() click to toggle source

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
      extend ActiveModel::Naming
    end

    Person.model_name.name     # => "Person"
    Person.model_name.class    # => ActiveModel::Name
    Person.model_name.singular # => "person"
    Person.model_name.plural   # => "people"

    # File lib/active_model/naming.rb, line 235
    def model_name
      @_model_name ||= begin
        namespace = parents.detect do |n|
          n.respond_to?(:use_relative_model_naming?) && n.use_relative_model_naming?
        end
        ActiveModel::Name.new(self, namespace)
      end
    end