gistfile1.rb

class SemiOpenStruct
  def initialize(hash={})
    @hash = hash
  end

  def method_missing(method,*args,&block)
    @hash[method] ||
      __try_hash_setter(method,*args,&block) ||
      super
  end

  def __try_hash_setter(method,*args,&block)
    if m=method.to_s.match(/(\w*)=/)
      @hash[m[1].to_sym] = args.first
    end
  end

  def respond_to?(method)
    @hash[method] || super
  end
end


[1] pry(main)> require Dir.home + '/scripts/utility/semi_open_struct'
=> true
[2] pry(main)> sos=SemiOpenStruct.new({a: 1, b: 2})
=> #<SemiOpenStruct:0x007fb931c4a4e0 @hash={:a=>1, :b=>2}>
[3] pry(main)> sos.c
NoMethodError: undefined method `c` for #<SemiOpenStruct:0x007fb931c4a4e0 @hash={:a=>1, :b=>2}>
from /Users/kstannard/scripts/utility/semi_open_struct.rb:9:in `method_missing`
[4] pry(main)> sos.c = 3
=> 3
[5] pry(main)> sos.c
=> 3