old_contents: from flask import Flask, render_template, session, redirect, url_for, flash
  from app import app, forms, models
  
  @app.route('/', methods=['GET', 'POST'])
  def index():
      login_form = forms.LoginForm()
      if login_form.validate_on_submit():
          user = models.User.query.filter_by(username = login_form.username.data).first()
          if user:
              # Used to display user-specific nav items
              session['logged_in'] = True
              return redirect(url_for('create'))
          else:
              flash('Invalid username or password.')
      return render_template('login.html', form=login_form)
  
  
  @app.route('/logout')
  def logout():
      session['logged_in'] = False
      flash('You have been logged out.')
      return redirect('/')
  
  
  @app.route('/create/', methods=['GET', 'POST'])
  def create():
      form = forms.CreateForm()
      if form.validate_on_submit():
          # TODO: If save was a success, inform user
          # Otherwise report error message.
          flash('The form has been submitted successfully.')
      return render_template('create.html', form=form)
  
  
  @app.errorhandler(404)
  def page_not_found(e):
      return render_template('404.html'), 404
  
new_contents: from flask import Flask, render_template, session, redirect, url_for, flash
  from app import app, forms, models, db
  import datetime
  
  @app.route('/', methods=['GET', 'POST'])
  def index():
      login_form = forms.LoginForm()
      if login_form.validate_on_submit():
          user = models.User.query.filter_by(username = login_form.username.data).first()
          if user:
              # Used to display user-specific nav items
              session['logged_in'] = True
              return redirect(url_for('create'))
          else:
              flash('Invalid username or password.')
      return render_template('login.html', form=login_form)
  
  
  @app.route('/logout')
  def logout():
      session['logged_in'] = False
      flash('You have been logged out.')
      return redirect('/')
  
  
  @app.route('/create/', methods=['GET', 'POST'])
  def create():
      if not session['logged_in']:
          flash('You are not logged into the system.')
          return redirect('/')
  
      create_form = forms.CreateForm()
      if create_form.validate_on_submit():
          # Create a patient from user input
          patient = models.Patient(forename = create_form.forename.data,
                                   surname = create_form.surname.data,
                                   dob = datetime.datetime.strptime(create_form.dob.data, "%d/%m/%Y"),
                                   mobile = create_form.mobile.data
                                  )
          # Add patient data to database
          db.session.add(patient)
          db.session.commit()
      # Reset the form & redirect to self.
      flash('The form has been submitted successfully.')
      create_form.reset()
      return render_template('create.html', form=create_form,error='error')
  
  
  @app.errorhandler(404)
  def page_not_found(e):
      return render_template('404.html'), 404
  
subject: Add patient data from the create form to the database.