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CREATE TABLE IF NOT EXISTS countries ( 

);

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CREATE TABLE dup_countries
AS SELECT *
FROM countries
WITH NO DATA;

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CREATE TABLE dup_countries
AS SELECT *
FROM countries;

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class CreateSmartphones < ActiveRecord::Migration[6.1]
  def change
    create_table :smartphones do |t|
      t.string :brand, null: false
      t.string :model, null: false

      t.timestamps
    end
  end
end

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<%= form_with model: @user, url: users_create_path do | field | %>
  Name
  <%= field.text_field :name %>
  <br>
  <%= field.submit :Create %>
<% end %>

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  def create
    @user = User.new(users_params)
    if @user.save
      redirect_to @user
    else
      render "new"
    end
  end

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class UsersController < ApplicationController
  def new
  end

  def create
  end

  def update
  end

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class UsersController < ApplicationController
  def new
  end

  def create
  end

  def update
  end
 end

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  create_table "passports", force: :cascade do |t|
    t.integer "number"
    t.integer "user_id", null: false
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["user_id"], name: "index_passports_on_user_id"
  end

  create_table "users", force: :cascade do |t|
    t.string "name"

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  validates_each :email do | record, attr, value |
    # extracts email service
    service = value.match(/\A\w+\.?\w*\@{1}([a-z]+)\.{1}[a-z]+\z/).to_a[1]
    # creates error for the attribute
    record.errors.add(attr, "#{service} email service is not allowed!") if service.in? %w(yahoo msn aol hotmail)
  end