How do I split a string into three parts?

Question

I have the string "001-1776591-7", and I want to divide it into 3 parts, "-" being the split parameter.

I have already created two methods, for the first and last, but what about the second part of the string, how can I get that?

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More Info:

I created the two methods in my Class, but when loading the view I get an error, details below:

  def serie
      @serie || cedula.to_s.split('-').[0] : @serie
  end

  def identificador
      @identificador || cedula.to_s.split('-').[1] : @identificador
 end

 def verificador
      @verificador || cedula.to_s.split('-').[2] : @verificador
 end


SyntaxError in TecnicosController#index

/home/lurraca/Desktop/rails_project/ArLink/app/models/tecnico.rb:7: syntax error, unexpected '['
          @serie || cedula.to_s.split('-').[0] : @serie
                                           ^
/home/lurraca/Desktop/rails_project/ArLink/app/models/tecnico.rb:11: syntax error, unexpected '['
...dor || cedula.to_s.split('-').[1] : @identificador
...                              ^
/home/lurraca/Desktop/rails_project/ArLink/app/models/tecnico.rb:15: syntax error, unexpected '['
          @verificador || cedula.to_s.split('-').[2] : @verificador

Answer 1

The split method returns an array, so you can access the second element of it the same way you would get the second element of any other array: array[1]. Also, using the || bar can make your code simpler. Try this:

def serie
   @serie || cedula.to_s.split('-')[0]
end

def banana
   @banana || cedula.to_s.split('-')[1]
end

def verificador
   @verificador || cedula.to_s.split('-')[2]
end

Answer 2

Why not set them all at once?

@serie, @identificador, @verificador = cedula.split('-')

You can make them attributes via attr_accessor or attr_reader if you still want to access them via methods.