module ActiveModel::Naming

def self.extended(base) # :nodoc:

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

def self.model_name_from_record_or_class(record_or_class) # :nodoc:

:nodoc: 
def self.model_name_from_record_or_class(record_or_class) # :nodoc:
  if record_or_class.respond_to?(:to_model)
    record_or_class.to_model.model_name
  else
    record_or_class.model_name
  end
end

def self.param_key(record_or_class)

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

ActiveModel::Naming.param_key(Blog::Post) # => "post"
# For isolated engine:

namespaced models regarding whether it's inside isolated engine.
Returns string to use for params names. It differs for 
def self.param_key(record_or_class)
  model_name_from_record_or_class(record_or_class).param_key
end

def self.plural(record_or_class)

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

Returns the plural class name of a record or class. 
def self.plural(record_or_class)
  model_name_from_record_or_class(record_or_class).plural
end

def self.route_key(record_or_class)

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

ActiveModel::Naming.route_key(Blog::Post) # => "blog_posts"
# For shared engine:

ActiveModel::Naming.route_key(Blog::Post) # => "posts"
# For isolated engine:

namespaced models regarding whether it's inside isolated engine.
Returns string to use while generating route names. It differs for 
def self.route_key(record_or_class)
  model_name_from_record_or_class(record_or_class).route_key
end

def self.singular(record_or_class)

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

Returns the singular class name of a record or class. 
def self.singular(record_or_class)
  model_name_from_record_or_class(record_or_class).singular
end

def self.singular_route_key(record_or_class)

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

ActiveModel::Naming.singular_route_key(Blog::Post) # => "post"
# For isolated engine:

namespaced models regarding whether it's inside isolated engine.
Returns string to use while generating route names. It differs for 
def self.singular_route_key(record_or_class)
  model_name_from_record_or_class(record_or_class).singular_route_key
end

def self.uncountable?(record_or_class)

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

Identifies whether the class name of a record or class is uncountable. 
def self.uncountable?(record_or_class)
  model_name_from_record_or_class(record_or_class).uncountable?
end

def inherited(base) 

def inherited(base)
  super
  base.class_eval do
    @_model_name = nil
  end
end

def model_name

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

end
extend ActiveModel::Naming
class Person

(See ActiveModel::Name for more information).
used to retrieve all kinds of naming-related information
Returns an ActiveModel::Name object for module. It can be 
def model_name
  @_model_name ||= begin
    namespace = module_parents.detect do |n|
      n.respond_to?(:use_relative_model_naming?) && n.use_relative_model_naming?
    end
    ActiveModel::Name.new(self, namespace)
  end
end