Geo*_*ieF 17 ruby dsl metaprogramming
我想在瞬间做一些魔术,并将类方法添加到某个类中.因此我尝试了以下方法:
module Magic
def self.included(base)
base.extend ClassMethods
end
module ClassMethods
def method_added(name)
puts "class method '#{name}' added"
end
def some_class_method
puts "some class method"
end
end
end
class Foo
include Magic
def self.method_added(name)
puts "instance method #{name} added"
end
end
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这种方法适用于实例方法,类方法失败.我怎么解决这个问题?有什么建议?
Joh*_*rug 26
您正在寻找singleton_method_added:
module Magic
def self.included(base)
base.extend ClassMethods
end
module ClassMethods
def method_added(name)
puts "instance method '#{name}' added"
end
def singleton_method_added(name)
puts "class method '#{name}' added"
end
end
end
class Foo
include Magic
def bla
end
def blubb
end
def self.foobar
end
end
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输出:
instance method 'bla' added
instance method 'blubb' added
class method 'foobar' added
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请享用!