在创业板开启的ActiveRecord的扩展 [英] Turning extension of ActiveRecord in gem

问题描述

此扩展名来创建 cache_find 方法的应用程序的所有型号（我创建这个使用的这个帖子）。

This extension create cache_find method for all models of app (I've create this using this post).

配置/ active_record_extension.rb

config/active_record_extension.rb

module ActiveRecordExtension

  extend ActiveSupport::Concern

  # add your instance methods here
  def flush_find
    Rails.cache.delete([self.class.name, :cached_find, id])
  end

  included do
    after_commit :flush_find
  end

  module ClassMethods
    def cached_find id
      Rails.cache.fetch([self.name, :cached_find, id]) { self.find(id) }
    end
  end
end

# include the extension
ActiveRecord::Base.send(:include, ActiveRecordExtension)

我把这个code成宝石，并加入到这一回购。

所以我要动态地添加这个方法是这样的：

So I want to add this methods dynamically, something like this:

class User << ActiveRecord::Base
  # id, name, email, age...

  cached :find, :find_by_name, :find_by_email
end

和上面的code应该产生 cached_find ， flush_find ， cached_find_by_name ， flush_find_by_name ...你得到它。

and the above code should generate cached_find, flush_find, cached_find_by_name, flush_find_by_name... You get it.

我需要帮助：

1. 测试 Rails.cache 方法 model_caching 宝石。
2. 创建code动态添加方法的基础上缓存方法的参数应用模式。

1. Test Rails.cache methods in model_caching gem.
2. Create code to dynamically add methods to app models based on cached method arguments.

这帮助了我，但不符合所有的一些链接：

Some links that helped me but do not meet all:

https://github.com/radar/guides/ BLOB /主/ extending-active-record.md

http://railscasts.com/episodes/245-new-gem-与打捆

http://guides.rubyonrails.org/plugins.html

下跌免费克隆和完善宝石code 。

Fell free to clone and improve gem code.

推荐答案

您不必砍的ActiveRecord :: Base的。您可以添加什么马克 - 亚历山大说，右转进入你的关心，像这样：

You don't have to hack ActiveRecord::Base. You can add what Marc-Alexandre said right into your concern, like so:

module ActiveRecordExtension
  extend ActiveSupport::Concern

  ...

  module ClassMethods
    def cached(*args)
      define_method "cached_#{arg.to_s}" do 
        # do whatever you want to do inside cached_xx
      end

      define_method "flush_#{arg.to_s}" do
        # do whatever you want to to inside flush_xx
      end
    end
  end
end

另外，我也不会自动包括扩展名直接在ActiveRecord的，我认为这是最好明确其包含在你要使用它的车型。

Also, I would not auto include the extension directly in ActiveRecord, I think it's better to explicitly include it in the models you are going to use it.

这篇关于在创业板开启的ActiveRecord的扩展的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！