Ruby

Question

我有一个class这样的

class A
    #this array of attributes is dynamic, just give example for understanding easier
    attributes = ['abc','S1','S2','S3']
    attributes.each do |e|
        attr_accessor e.to_sym
    end
end

我想为每个属性调用 setter。所以，我尝试了这个（因为你明白我想要什么）

a = A.new
attributes = ['abc','S1','S2','S3']
attributes.each do |attr|
    #I know the following command is wrong (because 'attr' is not a attribute of class A)
    a.attr = 1
end

那么，动态属性如何调用setter呢？

P/s：使用 Ruby 1.8.7 和 Rails 2.3.5 谢谢。

Answer 1

你应该打电话给

a.send "#{attr}=", 1
a.save!

Answer 2

你可以试试这个

def set_attributes(*attributes)
    attributes.each {|attribute| self.send("#{attribute}=", 1)}
end

Ruby - 如何在 class 中设置动态属性值

Ruby - How to set value for dynamic attribute in class

ruby-on-rails

getter-setter