mass_assignment.rb

require 'pry'
require 'pry-nav'
class Person

  def initialize(att)
    self.class.class_eval do
      att.each do |method, value|
        define_method(method) do
          instance_variable_get("@#{method}")
        end
        define_method("#{method}=") do |arg|
          instance_variable_set("@#{method}", arg)
        end
      end
    end
    att.each do |key, value|
      public_send("#{key}=", value)
    end

  end

end
attributes_hash = {:name => "blake", :height => 7, :color => "green"}
person = Person.new(attributes_hash)
binding.pry
person