Working Example

app/__init__.py

@@ -1,9 +1,14 @@
 from flask import Flask
+from config import Config
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
 from flask_login import LoginManager
 
 app = Flask(__name__)
-app.config["SECRET_KEY"] = "fdsaGHJ768fdsGHKJHG656&*(&%&*(fsd"
+app.config.from_object(Config)
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)
 login = LoginManager(app)
 login.login_view = "login"
 
-from app import routes
+from app import routes, models

app/forms.py

@@ -6,5 +6,4 @@ from wtforms.validators import DataRequired
 class LoginForm(FlaskForm):
     username = StringField("Username", validators=[DataRequired()])
     password = PasswordField("Password", validators=[DataRequired()])
-    remember_me = BooleanField("Remember Me")
     submit = SubmitField("Sign In")

app/models.py

@@ -1,9 +1,18 @@
-from werkzeug.security import generate_password_hash, check_password_hash
 from flask_login import UserMixin
-from app import login
+from werkzeug.security import check_password_hash, generate_password_hash
+
+from app import db, login
 
 
-class User(UserMixin):
+class User(UserMixin, db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(64), index=True, unique=True)
+    email = db.Column(db.String(120), index=True, unique=True)
+    password_hash = db.Column(db.String(128))
+
+    def __repr__(self):
+        return "<User {}>".format(self.username)
+
     def set_password(self, password):
         self.password_hash = generate_password_hash(password)
 
@@ -13,4 +22,4 @@ class User(UserMixin):
 
 @login.user_loader
 def load_user(id):
-    return 0
+    return User.query.get(int(id))

app/routes.py

@@ -1,10 +1,19 @@
-from flask import render_template, flash, redirect, url_for
+from flask import flash, redirect, render_template, url_for
+from flask_login import current_user, login_required, login_user, logout_user
+
 from app import app
 from app.forms import LoginForm
-from flask_login import current_user, login_user, login_required
 from app.models import User
 
 
+@app.route("/")
+@app.route("/index")
+@login_required
+def index():
+    user = {"username": "Miguel"}
+    return render_template("index.html", title="Home", user=user)
+
+
 @app.route("/login", methods=["GET", "POST"])
 def login():
     if current_user.is_authenticated:
@@ -20,13 +29,7 @@ def login():
     return render_template("login.html", title="Sign In", form=form)
 
 
-@app.route("/")
-@app.route("/index")
-@login_required
-def index():
-    user = {"username": "Miguel"}
-    posts = [
-        {"author": {"username": "John"}, "body": "Beautiful day in Portland!"},
-        {"author": {"username": "Susan"}, "body": "The Avengers movie was so cool!"},
-    ]
-    return render_template("index.html", title="Home", user=user, posts=posts)
+@app.route("/logout")
+def logout():
+    logout_user()
+    return redirect(url_for("index"))

app/templates/login.html

@@ -4,11 +4,17 @@
     {{ form.hidden_tag() }}
     <p>
         {{ form.username.label }}<br>
-        {{ form.username(size=32) }}
+        {{ form.username(size=32) }}<br>
+        {% for error in form.username.errors %}
+        <span style="color: red;">[{{ error }}]</span>
+        {% endfor %}
     </p>
     <p>
         {{ form.password.label }}<br>
-        {{ form.password(size=32) }}
+        {{ form.password(size=32) }}<br>
+        {% for error in form.password.errors %}
+        <span style="color: red;">[{{ error }}]</span>
+        {% endfor %}
     </p>
     <p>{{ form.submit() }}</p>
 </form>