我希望能够动态创建类,用于从我的Rails应用程序之外编写,继承自ActiveRecord。
我坚持这样的事情:
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'
如何让它发挥作用,或者有人能告诉我更好的方法吗?
答案 0 :(得分:4)
Nailed it:
def create_arec(table_name, &block)
klass = Class.new(ActiveRecord::Base){self.table_name = table_name}
klass.class_eval &block
klass
end
谢谢@phoet