Question

I am trying to write a ruby function that iterates through an array of strings that are method names and uses the Object#send method to save values in a new instance object (not even sure if thats legit) that is a transformation of an already existing one. That’s the best I can explain it. Here’s the idea:

@example = RelatedClass.new

def example_method
  instance_dependant_float = related_class.myvalue / other_related_class.myvalue

  ARRAY_OF_METHODS.each do |t|
    @example.send(t+'=', self.related_class.t * instance_dependant_float)
  end
end

When I try to run something like this where I call the index “t” on two separate ocassions (in my send and in the multiplier) it NoMethodError’s on the second ocassion.

Answer 1

You need to send to get the value also:

ARRAY_OF_METHODS.each do |name|
   @example.send( :"#{name}=", related_class.send(name) * some_float )
end

I always use and advocate string interpolation over String#+, and you don’t need the self. to get the related_class.