it's correct create multiple classes in ruby? - ruby

Question

Hi i have a question because i usually use multiple classes in Ruby but i dont know if is that correct?, for example the next code:
Class Main.rb
class Main
require_relative 'Archivo.rb'
require_relative 'Diccionario.rb'
require_relative 'Jsn.rb'
hsh = Diccionario.new
jsn = Jsn.new
fl = Archivo.new
puts "Ingresa Nombre"
nombre = gets
puts "Ingresa Correo"
correo = gets
puts "Ingresa password"
password = gets
hsh.usuario(nombre,correo,password)
jsn.convert_json(hsh.get_usuario)
fl.write('usuario.json',jsn.get_json)
fl.read('usuario.json')
puts fl.get_line
end
Class Diccionario.rb in other file
class Diccionario
$usuarios = Hash.new
require 'json'
def usuario(nombre, correo, password)
$usuarios = {nombre: nombre, correo: correo, password: password}
end
def get_usuario
$usuarios
end
end
Class Jsn.rb in other file
class Jsn
require 'json'
$cadena
def convert_json(cadena)
$cadena = cadena.to_json
end
def get_json
$cadena
end
end
Class Archivo.rb in other file
class Archivo
$line
def read(file)
File.open(file,"r") {|archivo|
$line =archivo.gets
}
end
def write(file,cadena)
File.open(file, "w+") do |f|
f.puts cadena
end
end
def get_line()
$line.to_s
end
end
Thanks :D

Answer 1

You should definitely be creating multiple classes! I would try to think in terms of SOLID principles to ascertain where behaviour belongs and which objects/classes have responsibility for implementing them.
There's an excellent book called Practical Object Oriented Design in Ruby by Sandi Metz. It's a great book about how to organise your code into classes. It talks about SRP (Single Responsibility Principle) and how to drill down to the essence of the problem you're trying to solve. If you can't buy the book then there's a talk that covers the main points here:
https://www.youtube.com/watch?v=8bZh5LMaSmE
She actually mentions that it's a common error to "not create enough classes" and that you should feel confident to break the implementation down further to smaller manageable classes.