def sign_up():
"""Registration form."""
form = SignUpForm()
if form.validate_on_submit():
user = User.fetch_by_email(form.primary_email.data)
if user:
form.add_error('email', 'User with such e-mail address already exists.')
else:
user = User()
with db.transaction as session:
user.name = form.name.data
user.password = form.password.data
session.add(user)
with db.transaction:
user.primary_email = form.primary_email.data
return redirect(url_for('sign_in'))
return render_template('sign_up.html', form=form)
