如何更新自我模型轨道属性

问题描述

如何更新自身模型轨道？

how to update self model in rails?

class BillSubTotal < ActiveRecord::Base
  def self.total
    self.update_attributes(:total => 150)
  end
end

我想从自我模型更新模型BillSubTotal价值？

i want update value in model BillSubTotal from self model?

推荐答案

取决于你想要做的你如何去这个问题。

Depends on what you're wanting to do as how you'd go about this.

导轨自动创建的getter / setter方法​​的数据库列，所以你不必明确创建功能，并且可以只设置方法如下所示：

Rails automatically creates the getter/setter methods for database columns, so you don't have to create that functionality explicitly, and can just set the method like so:

class BillSubTotal < ActiveRecord::Base
  def update_total
    self.total = 150
  end
end

或者，如果你正在使用的类的实例直接：

Or if you're working with an instance of the class directly:

bill_subtotal_instance.total = 150

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