一个元编程的代码跟踪，求大神指教其中的调用顺序，有点摸不着头绪了

wukong — Wed, 10 Apr 2013 15:51:54 +0800

module TraceCalls
    def self.included(klass)
        klass.instance_methods(false).each do |existing_method|
            wrap(klass, existing_method)
        end
        def klass.method_added(method)
            puts "@@@"
            puts method
            puts @trace_calls_internal
            puts "$$$$"
            unless @trace_calls_internal
                @trace_calls_internal = true
                TraceCalls.wrap(self, method)
                @trace_calls_internal = false
            end
        end
    end
    def self.wrap(klass, method)
        puts "###{}"
        puts klass
        puts method
        puts "*****"
        klass.instance_eval do
            method_object = instance_method(method)
            define_method(method) do |*args, &block|
                puts "==> calling #{method} with #{args.inspect}"
                result = method_object.bind(self).call(*args, &block)
                puts "<== #{method} returned #{result.inspect}"
                result
            end
        end
    end
end
class Example
    def one(arg)
        puts "One called with #{arg}"
    end
end
ex1 = Example.new
ex1.one("Hello")
class Example
    include TraceCalls
    def two(arg1, arg2)
        arg1 + arg2
    end
end
ex1.one("GoodBye")
puts ex1.two(4, 5)

上面的代码跟踪有点绕，不是很清楚，希望大神们帮解析一下这其中的调用，还有像这种 ruby 元编程的东西有没有什么好方法去学习？

ruby method_missing 重写报错，望大牛给予帮助

wukong — Tue, 09 Apr 2013 12:24:09 +0800

class MyOpenStruct < BasicObject
    def initialize(initial_values = {})
        @values = initial_values
    end
    def _singleton_class
        class << self
            self
        end
    end
    def method_missing(name, *args, &block)
        if name[-1] == "="
            base_name = name[0..-2].intern
            _singleton_class.instance_exec(name) do |name|
                define_method(name) do |value|
                    @values[base_name] = value
                end
            end
            @value[base_name] = args[0]
        else
            #super unless @values.has_key? name
            _singleton_class.instance_exec(name) do |name|
                define_method(name) do
                    @values[name]
                end
            end
            @values[name]
        end
    end
end
my = MyOpenStruct.new(name: "chenchao")
my.address = "beijing"
my.likes = "beauty girl"
puts "#{my.name} lives in #{my.address} , likes #{my.likes}"

执行收到错误信息是 /home/stephan/work/test/hook.rb:61:in method_missing': undefined method[]=' for nil:NilClass (NoMethodError) from /home/stephan/work/test/hook.rb:74:in `

' 检查程序没发现错误，求指教

wukong (陈超)

一个元编程的代码跟踪， 求大神指教其中的调用顺序， 有点摸不着头绪了

ruby method_missing 重写报错， 望大牛给予帮助

一个元编程的代码跟踪，求大神指教其中的调用顺序，有点摸不着头绪了

ruby method_missing 重写报错，望大牛给予帮助