[Python] DataError: (psycopg2.DataError) invalid input syntax for integer

I'm trying to add Flask-Login to my Flask-Python app but I'm having this error and I don't know why. I guess thats my user.loader that isnt correct but the idea is to load the user based on the ID or email.

What am I doing wrong?

full error:

DataError: (psycopg2.DataError) invalid input syntax for integer:
"t@t.pt" LINE 3: WHERE users.uid = 't@t.pt'


app.py

from flask import Flask, render_template, request, session, redirect, url_for
from models import db, User
from forms import SignupForm, LoginForm
from flask_login import LoginManager, UserMixin, \
login_required, login_user, logout_user

app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://localhost/polex'
db.init_app(app)

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

app.secret_key = "development-key"


@login_manager.user_loader
def user_loader(uid):
"""Given *user_id*, return the associated User object.

aram unicode user_id: user_id (email) user to retrieve
"""
return User.query.get(uid)


@app.route("/")
def index():
return render_template("index.html")

@app.route("/about")
def about():
return render_template("about.html")

@app.route("/signup", methods=["GET", "POST"])
def signup():
if 'email' in session:
return redirect(url_for('home'))

form = SignupForm()

if request.method == "POST":
if form.validate() == False:
return render_template('signup.html', form=form)
else:
newuser = User(form.first_name.data, form.last_name.data, form.email.data, form.password.data)
db.session.add(newuser)
db.session.commit()

session['email'] = newuser.email
return redirect(url_for('home'))

elif request.method == "GET":
return render_template('signup.html', form=form)

@app.route("/login", methods=["GET", "POST"])
def login():
print db

form = LoginForm()

if request.method == "POST":
if form.validate() == False:
return render_template("login.html", form=form)
else:
email = form.email.data
password = form.password.data

user = User.query.filter_by(email=email).first()
if user is not None and user.check_password(password):
login_user(user, remember=True)
return redirect(url_for('home'))
else:
return redirect(url_for('login'))

elif request.method == 'GET':
return render_template('login.html', form=form)

@app.route("/logout")
def logout():
session.pop('email', None)
return redirect(url_for('index'))

@app.route("/home", methods=["GET", "POST"])

def home():


return render_template("home.html")

if __name__ == "__main__":
app.run(debug=True)


models.py

from flask_sqlalchemy import SQLAlchemy
from werkzeug import generate_password_hash, check_password_hash
from flask_login import UserMixin

db = SQLAlchemy()

class User(db.Model):
__tablename__ = 'users'
uid = db.Column(db.Integer, primary_key = True)
firstname = db.Column(db.String(100))
lastname = db.Column(db.String(100))
email = db.Column(db.String(120), unique=True)
pwdhash = db.Column(db.String(54))

#-----login requirements-----
def is_active(self):
#all users are active
return True

def get_id(self):
# returns the user e-mail. not sure who calls this
return self.email

def is_authenticated(self):
return self.authenticated

def is_anonymous(self):
# False as we do not support annonymity
return False

def __init__(self, firstname, lastname, email, password):
self.firstname = firstname.title()
self.lastname = lastname.title()
self.email = email.lower()
self.set_password(password)

def set_password(self, password):
self.pwdhash = generate_password_hash(password)

def check_password(self, password):
return check_password_hash(self.pwdhash, password)

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