Rails 在编辑表单上转换百分比值 [英] Rails Convert Percentage Value on Edit Form

问题描述

我的 Customer 模型中有以下回调和方法.

I have the following callback and method in my Customer model.

before_save :convert_commission_percentage

def convert_commission_percentage
  self.commission= commission.to_f/100.to_f
end

这允许用户输入百分比为 45 并将其存储为 .45.但是，在编辑时，此百分比的字段在编辑表单上显示为 .45，导致该数字在更新时再次除以 100.有没有办法通过将编辑字段显示为 45 来防止这种情况发生?

This allows the user to input a percentage as 45 and store it as .45. However, on edit, the field for this percentage is then displayed as .45 on the edit form, causing that number to be divided by 100 again on update. Is there a way to keep this from happening by displaying the edit field as 45?

推荐答案

有几个选项:

1. 为什么存储转换后的值，为什么不存储用户输入的任何内容而不做修改.commission_percentage 可能是一个更好的名字.如果您想使用 commission，您可以使用 alias_attribute :commission, :commission_percentage 创建一个别名 commission 到 commission_percentage> 属性而不是应用程序中的 commission_percentage 属性.

1. Why store converted value, why not store whatever the user inputs without modification. commission_percentage might be a better name. You could create an alias commission to commission_percentage with alias_attribute :commission, :commission_percentage if you'd like to use commission attribute instead of commission_percentage attribute in your application.

使用 after_initialize 回调:

before_save :convert_commission_percentage

after_initialize do 
  commission = commission.to_f * 100
end

def convert_commission_percentage
  self.commission= commission.to_f/100.to_f
end

通过 getter 和 setter:

Through getters and setters:

def commission=(value)
  write_attribute :commission, value.to_f/100
end

def commision
  read_attribute(:commission).to_f * 100
end

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