initializer set attr_accessor

data_store.rb

class DataStore
  attr_accessor :hoge
  attr_accessor :fuga
  def initialize *params
    params = params.first
    unless params.empty?
      params.each do |k, v|
        if self.respond_to?(v) && self.respond_to?("#{v}=")
          self.instance_variable_set("@#{k}".to_sym, v)
        end
      end
    end
  end
end

data = DataStore.new hoge: "hoge", fuga: "fuga", nothing_val: "val"
p data # <DataStore:0x007ff4f8b903a8 @hoge="hoge", @fuga="fuga">