动态地创建一个类从ActiveRecord的继承？ [英] Dynamically create a class inherited from ActiveRecord?

问题描述

我希望能够超出了我的Rails应用程序，从ActiveRecord的继承动态创建类的脚本。

I want to be able to dynamically create classes, for scripting outside my Rails app, that inherit from ActiveRecord.

我卡上是这样的：

require 'active_record'

def create_arec(table_name)
  Class.new ActiveRecord::Base do
    self.table_name = table_name
    yield
  end
end

Band = create_arec 'bands' do
  scope :only_rock, -> {where genre: 'rock'}
end

rock_bands = Band.only_rock #undefined method `only_rock'

我如何使它工作，或有人可以告诉我更好的方法来做到这一点？

How do I make it work, or can someone show me better way to do it?

推荐答案

钉它：

def create_arec(table_name, &block)
  klass = Class.new(ActiveRecord::Base){self.table_name = table_name}
  klass.class_eval &block
  klass
end

由于@phoet

thanks @phoet

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