Don't know whats wrong with the tacocat program?

from flask import (Flask, g, render_template, flash, redirect, url_for, abort)
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 = 'neiofh23tipQ3RWHGREJFK;SJDWR2I4TG34QW=oglvo0e5ujhynhrjaefpo'

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 == username)
    except models.DoesNotExist:
        return None


@app.before_request
def before_request():
    g.db = models.DATABASE
    g.db.connect()
    g.user = current_user


@app.after_request
def after_request(response):
    g.db.close()
    return response


@app.route('/register', methods=('GET', 'POST'))
def register():
    form = forms.RegisterForm()
    if form.validate_on_submit():
        models.User.create_user(
            username=form.username.data,
            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("Your email or password doesn't match!")
        else:
            if check_password_hash(user.password, form.password.data):
                login_user(user)
                flash("You logged in!")
                return redirect(url_for('index'))
            else:
                flash("Your email or password doesn't match!")
    return render_template('login.html', form=form)


@app.route('/logout')
@login_required
def logout():
    logout_user()
    return redirect(url_for('index'))


@app.route('/')
def index():
    tacos = models.Taco.select().limit(25)
    return render_template('index.html', index=index, tacos=tacos)


@app.route('/new-taco', methods=('GET', 'POST'))
@login_required
def tacos():
    form = forms.TacoForm()
    if form.validate_on_submit():
        models.Taco.create(user=g.user._get_current_object(),
                            protein=form.protein.data.strip(),
                            shell=form.shell.data.strip(),
                            cheese=form.cheese.data.strip(),
                            extra=form.extra.data.strip())
        return redirect(url_for('index'))
    return render_template('taco.html', form=form)


@app.route('/tacos/<int:taco_id>')
def veiw_tacos(post_id):
    tacos = models.Taco.select().where(models.Taco.id == taco_id)
    if tacos.count() == 0:
        flash("New site sorry We will have stuff on soon you could make the first post!")
    return render_template('index.html', tacos=tacos)









if __name__ == '__main__':
    models.initialize()
    app.run(debug=DEBUG, host=HOST, port=PORT)

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

from models import User


def name_exists(form, field):
    if User.select().where(User.username == field.data).exists():
        raise ValidationError("User with that name allready exists.")


def email_exists(form, field):
    if User.select().where(User.email == field.data).exists():
        raise ValidatorsError("User with that email allready exists.")

class RegisterForm(Form):
    username = StringField(
        'Username',
        validators=[
            DataRequired(),
            Regexp(
                r'^[a-zA-Z0-9_]+$',
                message=("Username should be one word, letters, "
                         "numbers, and underscores only.")
            ),
            name_exists
        ])
    email = StringField(
        'Email',
        validators=[
            DataRequired(),
            Email(),
            email_exists
        ])
    password = PasswordField(
        'Password',
        validators=[
            DataRequired(),
            Length(min=4),
            EqualTo('password2', message='Passwords must match')
        ])
    password2 = PasswordField(
        'Confirm Password',
        validators=[DataRequired()]
    )


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


class TacoForm(Form):
    protein = StringField("What type of protein is in your taco? Beans? Beef?", validators=[DataRequired()])
    shell = StringField("What type of shell is your taco?", validators=[DataRequired()])
    cheese = BooleanField("Cheese", default=True)
    extras = TextAreaField("Add any other detail.", validators=[DataRequired()])

import datetime

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

DATABASE = SqliteDatabase('tacocat.db')

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

    class Meta:
        database = DATABASE

    @classmethod
    def create_user(cls, username, email, password, admin=False):
        try:
            with DATABASE.transaction():
                cls.create(
                    username=username,
                    email=email,
                    password=generate_password_hash(password),
                    is_admin=admin
                )
        except IntegrityError:
            raise ValueError("User allready exists")


class Taco(Model):
    timestamp = DateTimeField(default=datetime.datetime.now)
    user = ForeignKeyField(
        rel_model=User,
        related_name='tacos'
    )
    protein = CharField(max_length=25)
    shell = CharField(max_length=25)
    cheese = BooleanField()
    extras = TextField()

    class Meta:
        databse = DATABASE
        order_by = ('-timestamp',)






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