Module: ActiveModel::Naming

Included in:
Translation, ActiveRecord::Base
Defined in:
activemodel/lib/active_model/naming.rb

Overview

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.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(base) ⇒ Object

:nodoc:


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# File 'activemodel/lib/active_model/naming.rb', line 219

def self.extended(base) #:nodoc:
  base.remove_possible_method :model_name
  base.delegate :model_name, to: :class
end

.param_key(record_or_class) ⇒ Object

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"

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# File 'activemodel/lib/active_model/naming.rb', line 304

def self.param_key(record_or_class)
  model_name_from_record_or_class(record_or_class).param_key
end

.plural(record_or_class) ⇒ Object

Returns the plural class name of a record or class.

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

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# File 'activemodel/lib/active_model/naming.rb', line 249

def self.plural(record_or_class)
  model_name_from_record_or_class(record_or_class).plural
end

.route_key(record_or_class) ⇒ Object

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.


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# File 'activemodel/lib/active_model/naming.rb', line 292

def self.route_key(record_or_class)
  model_name_from_record_or_class(record_or_class).route_key
end

.singular(record_or_class) ⇒ Object

Returns the singular class name of a record or class.

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

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# File 'activemodel/lib/active_model/naming.rb', line 257

def self.singular(record_or_class)
  model_name_from_record_or_class(record_or_class).singular
end

.singular_route_key(record_or_class) ⇒ Object

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"

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# File 'activemodel/lib/active_model/naming.rb', line 277

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) ⇒ Boolean

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

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

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# File 'activemodel/lib/active_model/naming.rb', line 265

def self.uncountable?(record_or_class)
  plural(record_or_class) == singular(record_or_class)
end

Instance Method Details

#model_nameObject

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"

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# File 'activemodel/lib/active_model/naming.rb', line 236

def model_name
  @_model_name ||= begin
    namespace = self.parents.detect do |n|
      n.respond_to?(:use_relative_model_naming?) && n.use_relative_model_naming?
    end
    ActiveModel::Name.new(self, namespace)
  end
end