edenjp

1 - rails new concern
rails generate model Product name company:text
rails generate model Category name:text
rails generate model Tag name:text product_id category_id:integer

2 - Arquivo seed
require 'faker'
produtos = (1..100).to_a
categorias = (1..5).to_a

edenjp

1 - rails new scope

2- rails generate model User name:string email:string born:date gender:string
rake db:migrate

3- sexo = [   "Masculino",   "Feminino"  ]

1_000.times do |i|
  User.create(name: Faker::Company.name, email: Faker::Internet.email, born: Faker::Date.between(10000.days.ago, Date.today), gender: sexo.sample)
end

edenjp

class Calculadora
  def soma(a, b)
    a + b
  end
  
  def divide(a, b)
    a / b
  end

  def multiplica(a, b)

edenjp

class User
  def name
    @name
  end

  def name=(name)
    @name = name
  end

  def age