guoren/app/controllers/users_controller.rb

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

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

  def edit
    @user = current_user
    render 'edit'
  end


  def update
    if @user.update_attributes(user_params)
      flash[:success]="profile updated"
      redirect_to @user
    else
      render 'edit'
    end
  end


  private

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

end