Question

In ruby I can say (I picked up Mongoid only for example)

class MyItem
  include Mongoid::Document
  include Mongoid::Timestamps

  #.................

  def method1(some_type)
    raise "Not symbol" unless some_type.is_a?(Symbol)
    raise "Unsupported some_type (#{some_type})" unless [:some_type1, :some_type2, :some_type3].include?(some_type)
    min_time_to_update = 60*60
    full_method_name = "#{some_type}_another_method".to_sym()

    !!self.send(full_method_name)
  end
end

and call it

result = MyItem.first.method1(:some_type2)

Here the method send is being used to call a type’s method by its name. But what if I want to do the following

  def method1(type, arg1, arg2)
     #check if it's a correct type....
     # type might be either MyItem1 or MyItem2 or anything that has a method `method123`
     "#{type}".method123(arg1, arg2)
  end

How can I do that? How can I get access to the type by its name to call its method?

Answer 1

type being a string eg. ‘MyItem1’ or ‘MyItem2’?

Try Object.const_get(type).method123(arg1, arg2).