如何在Ruby中动态设置对象属性,例如
def set_property(obj, prop_name, prop_value)
#need to do something like > obj.prop_name = prop_value
#we can use eval but I'll prefer a faster/cleaner alternative:
eval "obj.#{prop_name} = #{prop_value}"
end
答案 0 :(得分:74)
使用send:
def set_property(obj, prop_name, prop_value)
obj.send("#{prop_name}=",prop_value)
end
答案 1 :(得分:3)
如果情况允许使用实例方法,则以下内容不会过于冒犯:
class P00t
attr_reader :w00t
def set_property(name, value)
prop_name = "@#{name}".to_sym # you need the property name, prefixed with a '@', as a symbol
self.instance_variable_set(prop_name, value)
end
end
用法:
p = P00t.new
p.set_property('w00t', 'jeremy')
答案 2 :(得分:1)
这个答案(https://stackoverflow.com/a/7466385/6094965)对我有用:
Object.send(attribute + '=', value)
attribute
必须是String
。因此,如果您通过Symbol
s(像我这样)的数组进行迭代,则可以使用to_s
。
Object.send(attribute.to_s + '=', value)