tap/app/controllers/users_controller.rb

class UsersController < ApplicationController
  def new
    @user = User.new
  end

  def show
    @user = User.find(params[:id])
    @orders = @user.orders.paginate(page: params[:page])
  end

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

  def index
    @users = User.all
  end

  private

    def user_params
      params.require(:user).permit(:name, :last_name, :password,
                                   :password_confirmation, :nickname)
    end
end