Failing a few tests. Please help

from flask import Flask, g, render_template, flash, redirect, url_for
from flask.ext.bcrypt import check_password_hash
from flask.ext.login import (LoginManager, login_user,
                             logout_user, login_required, current_user)

import forms
import models

DEBUG = True
PORT = 8000
HOST = '0.0.0.0'

app = Flask(__name__)
app.secret_key = 'youdontknowmysecretkey'

login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'

@login_manager.user_loader
def load_user(userid):
  try:
      return models.User.get(models.User.id == userid)
  except models.DoesNotExist:
      return None

@app.before_request
def before_request():
  """Connect to the database before each request."""
  g.db = models.DATABASE
  g.db.connect()
  g.user = current_user

@app.after_request
def after_request(response):
  """Close the database connection after each request."""
  g.db.close
  return response

@app.route('/register', methods=('GET', 'POST'))
def register():
  form = forms.RegisterForm()
  if form.validate_on_submit():
      flash("Yay, you registered!", "success")
      models.User.create_user(
          email = form.email.data,
          password = form.password.data
      )
      return redirect(url_for('index'))
  return render_template('register.html', form=form)

@app.route('/login', methods=('GET', 'POST'))
def login():
  form = forms.LoginForm()
  if form.validate_on_submit():
    try:
        user = models.User.get(models.User.email == form.email.data)
    except models.DoesNotExist:
        flash("Email is incompatible", "error")
    else:
        if check_password_hash(user.password, form.password.data):
            login_user(user)
            flash("You are logged in", "success")
            return redirect(url_for('index'))
        else:
            flash("Password does not match", "error")
  return render_template('login.html', form=form)

@app.route('/logout')
@login_required
def logout():
    logout_user()
    flash("You've been logged out! Come back soon!", "success")
    return redirect(url_for('index'))

@app.route('/new_taco', methods=('GET','POST'))
@login_required
def taco():
    form = forms.TacoForm()
    if form.validate_on_submit():
        models.Taco.create(user = g.user._get_current_object(),
                           protein = form.protein.data,
                           shell = form.shell.data,
                           cheese = form.cheese.data,
                           extras = form.extras.data.strip()
                          )
        flash("Your taco has been added!!", "success")
        return redirect(url_for('index'))
    return render_template('taco.html', form=form)


@app.route('/')
def index():
  tacos = models.Taco.select().limit(10)
  return render_template('index.html', tacos=tacos)


if __name__== '__main__':
  models.initialize()
  try:
    with models.DATABASE.transaction():
        models.User.create_user(
          email = 'billy@example.com',
          password = 'password'
        )
  except ValueError:
    pass
  app.run(debug=DEBUG, host=HOST, port=PORT)

import datetime

from flask.ext.bcrypt import generate_password_hash
from flask.ext.login import UserMixin
from peewee import *

DATABASE = SqliteDatabase('taco.db')

class User(UserMixin, Model):
    email = CharField(unique=True)
    password = CharField(max_length=100)

    class Meta:
      database = DATABASE

    def get_tacos(self):
      return Taco.select().where(Taco.user == self)

    def get_stream(self):
      return Taco.select().where(
          (Taco.user == self)
      )



    @classmethod
    def create_user(cls, email, password):
      try:
        cls.create(
          email = email,
          password = generate_password_hash(password))
      except IntegrityError:
        raise ValueError("User already exists")

class Taco(Model):
    protein = CharField()
    shell = CharField()
    cheese = BooleanField(default=True)
    extras = TextField()
    user = ForeignKeyField(
        rel_model = User,
        related_name = 'tacos'
    )

    class Meta:
      database = DATABASE


def initialize():
  DATABASE.connect()
  DATABASE.create_tables([User, Taco], safe=True)
  DATABASE.close()

from flask_wtf import Form
from wtforms import StringField, PasswordField, BooleanField, TextAreaField
from wtforms.validators import (DataRequired, ValidationError, Email,
                               Length, EqualTo)

from models import User

def email_exists(form, field):
    if User.select().where(User.email == field.data).exists():
        raise ValidatationError('User with that email already exists')

class RegisterForm(Form):
    email = StringField(
        'Email',
        validators = [
            DataRequired(),
            Email(),
            email_exists,
      ])
    password2 = PasswordField(
        'Confirm Password',
        validators = [DataRequired()]
    )
    password = PasswordField(
        'Password',
        validators=[
            DataRequired(),
            Length(min=2),
            EqualTo(password2, message='Passwords must match')
      ])

class LoginForm(Form):
    email = StringField('Email', validators = [DataRequired(), Email()])
    password = PasswordField('Password', validators = [DataRequired()])

class TacoForm(Form):
    protein = StringField('Protein')
    shell = StringField('Shell', validators = [DataRequired()])
    cheese = BooleanField('Cheese')
    extras = TextAreaField("Any extras?")