using_sessions_to_store_user_data

🔑 Using Sessions to Store User Data

Sessions let you persist small bits of data (like a user ID) between requests without manually handling cookies. In Rails, you can assign or read session values via the session hash in your controller. This is perfect for things like keeping track of a logged‑in user.

class ApplicationController < ActionController::Base
  def create
    user = User.find_by(email: params[:email])
    if user&.authenticate(params[:password])
      session[:user_id] = user.id
      redirect_to dashboard_path, notice: "Logged in!"
    else
      render :new, alert: "Invalid login"
    end
  end

  def current_user
    @current_user ||= User.find_by(id: session[:user_id])
  end
end