1

我对 Ruby 还很陌生，我看不到所有这些类和方法之间的联系。您能否解释一下每种方法的具体作用：

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 do |n|
      n.respond_to?(:use_relative_model_naming?) && n.use_relativve_model_naming?
    end
    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) #=> post
#
# For shared engine:
# ActiveModel::Naming.route_key(Blog::Post) #=> blog_post
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.
#
# 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.
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

我知道每种方法都有评论，但我仍然无法理解基本的元数据。

4

1 回答 1

1

该模块是 ActiveModel 的一部分，它有助于确保命名约定。

所有这一切的目标是提供一个标准接口，帮助从单个对象进行推断：

  • 文件属于应用程序结构的位置（这是控制器背后的魔力render，例如从控制器名称推断出视图应该在哪里）
  • 哪些标准 REST 路由应指向此资源
  • form_forparams 散列中的什么键将为特定对象生成帮助器
  • 等等...

很难再解释这个模块，因为它被依赖命名约定的独立逻辑位普遍使用。

于 2013-02-28T20:08:52.140 回答