module ApplicationHelper

  def logged_in?
    session[:user_id]
  end

  def current_user
    if session[:user_id]
      return User.find(session[:user_id])
    end
  end

end


------------------------------------------------
class PatientsController < ApplicationController

  def new
    @patient = current_user.patients.new
  end

  def create
    @patient = Patient.new(params[:patient])

    if @patient.save
      flash[:notice] = "Patient Saved"
      session[:user_id] = @patient.id
      redirect_to patient_path(@patient)
    else
      flash[:notice] = "Try Again!"
      render :new
    end
  end

  def show
    @patient = Patient.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @patient }
    end

  # GET /products/new
  # GET /products/new.json
  end

end


---------------------------------------------------------------