在处理嵌套了几层的hash时，总是感觉很混乱，读取、修改时都很麻烦。因此想到把hash转换为对象，直接生成key的get/set方法，代码如下：
class HashObj
class << self
def load_from_hash(hash)
if hash.instance_of? Hash
obj = HashObj.new
hash.each{|k,v| obj.send :def_sget_method,k,HashObj.load_from_hash(v)}
obj
elsif hash.instance_of? Array
hash.map{|m| HashObj.load_from_hash(m) }
else
hash
end
end
end
def attributes
hash = {}
@@reg ||= /=/
self.singleton_methods.reject{|x| @@reg =~ x.to_s}.each do |m|
v = self.send(m)
if v.instance_of? HashObj
real_v = v.attributes
elsif v.instance_of? Array
real_v = []
v.each do |l|
if l.instance_of? HashObj
real_v << l.attributes
else
real_v << l
end
end
else
real_v = v
end
hash[m] = real_v
end
hash
end
protected
def def_sget_method(name,val)
self.instance_variable_set "@#{name}",val
self.define_singleton_method "#{name}=" do |n_val|
instance_variable_set "@#{name}",n_val
end
self.define_singleton_method name do
instance_variable_get "@#{name}"
end
end
end
使用demo
hash = {name:'jack',age:22,phone:['61900871','8787876'],
basic_info:{country:'USA',city:'New York'}}
obj = HashObj.load_from_hash hash
obj.name #'jack'
obj.age #22
obj.phone #['61900871','8787876']
obj.basic_info #<HashObj:0x007f9eda02b360 @country="USA", @city="New York">
obj.basic_info.country #'USA'
obj.attributes == hash #true
obj.age = 30
obj.attributes #{:name=>"jack", :age=>30, :phone=>["61900871", "8787876"],
# :basic_info=>{:country=>"USA", :city=>"New York"}}
