动态设置 Ruby 对象的属性
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Set Attribute Dynamically of Ruby Object
提问by neebz
How can I set an object attribute dynamically in Ruby e.g.
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
回答by lucapette
回答by Jochem Schulenklopper
Object#instance_variable_set()is what you are looking for, and is the cleaner version of what you wanted.
Object#instance_variable_set()是您正在寻找的，并且是您想要的更干净的版本。
Example:
例子：
your_object = Object.new
your_object.instance_variable_set(:@attribute, 'value')
your_object
# => <Object:0x007fabda110408 @attribute="value">
Ruby documentation about Object#instance_variable_set
Ruby 文档关于 Object#instance_variable_set
回答by Benjineer
If circumstances allow for an instance method, the following is not overly offensive:
如果情况允许使用实例方法，以下内容并不过分冒犯：
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
Usage:
用法：
p = P00t.new
p.set_property('w00t', 'jeremy')
回答by Tincho Rockss
This answer (https://stackoverflow.com/a/7466385/6094965) worked for me:
这个答案（https://stackoverflow.com/a/7466385/6094965）对我有用：
Object.send(attribute + '=', value)
attributehas to be a String. So if you are iterating trough an array of Symbols (like me), you can use to_s.
attribute必须是一个String. 因此，如果您正在遍历Symbols数组（像我一样），则可以使用to_s.
Object.send(attribute.to_s + '=', value)
