Question

我想从模型的类方法生成url。我之前通过简单地包含ActionController::UrlWriter来实现这一点 - 我尝试将其包含在实例定义范围以及类定义范围中，但无济于事。

class Foo < ActiveRecord::Base
  # only works for instance methods
  # include ActionController::UrlWriter

  class << self
    # results in this error: undefined method `default_url_options' for Class:Class
    # include ActionController::UrlWriter
    def my_method
      return user_sprockets_url(:thingy => 'blue')
    end
  end    
end

Answer 1

class ModelURL
  include ActionController::UrlWriter
end

class User
  @url_generator = ModelURL.new
  class << self
    def admin_path
      @url_generator.send :admin_path
    end
  end
end

ruby-1.9.1-p378？＆gt; User.admin_path
=> "/admin"

Answer 2

甜！

一点点重构......

class ModelURL
  include ActionController::UrlWriter
  @@singleton = ModelURL.new
  class << self
    def singleton
      @@singleton
    end
  end
end

...使用

ModelURL::singleton.send :user_sprockets_url, :thingy => 'blue', :host => DOMAIN

如何从模型的类方法访问UrlWriter url / path生成器？

2 个答案: