class Post(db.Model):
id = db.Column(db.Integer, primary_key=True)
body = db.Column(db.String(140))
timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
def __repr__(self):
return '<Post {}>'.format(self.body)
class Notification(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(128), index=True)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
timestamp = db.Column(db.Float, index=True, default=time)
payload_json = db.Column(db.Text)
def get_data(self):
return json.loads(str(self.payload_json))
class Post(SearchableMixin, db.Model):
__searchable__ = ['body'] # dunder field tells sqlalchemy not to add field to database
id = db.Column(db.Integer, primary_key=True)
body = db.Column(db.String(140))
timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow) # passing a function
user_id = db.Column(db.Integer, db.ForeignKey('user.id')) # uses relationship
language = db.Column(db.String(5)) # five chars for language identification
def __repr__(self):
return f"<Post {self.body}, belongs to {self.user_id}>"
@staticmethod
def get_posts(filter_attr=None, filter_arg=None):
posts = None
if filter_attr is None: # get all posts
posts = Post.query.all()
elif filter_attr == 'user_id': # filter by username
posts = Post.query.filter_by(user_id=filter_arg).all()
elif filter_attr == 'timestamp':
posts = Post.query.filter_by(timestamp=filter_arg).all()
return posts
class User(UserMixin, db.Model): # UserMixin makes model compatible with flask-login
id = db.Column(db.Integer, primary_key=True) # flask login writes User.id to session
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))
posts = db.relationship('Post', backref='author', lazy='dynamic')
about_me = db.Column(db.String(140))
last_visited = db.Column(db.DateTime, default=datetime.utcnow())
followed = db.relationship(
'User', secondary=followers,
primaryjoin=(followers.c.follower_id == id),
secondaryjoin=(followers.c.followed_id == id),
backref=db.backref('followers', lazy='dynamic'),
lazy='dynamic'
)
messages_sent = db.relationship('Message',
foreign_keys='Message.sender_id',
backref='author', lazy='dynamic')
messages_received = db.relationship('Message',
foreign_keys='Message.recipient_id',
backref='recipient', lazy='dynamic')
last_message_read_time = db.Column(db.DateTime)
notifications = db.relationship('Notification', backref='user',
lazy='dynamic')
def __repr__(self): # used as representation of row data in the database used for each instance of a model
return f"<user {self.username}>"
def check_password(self, sanitized_password): # upon login
return check_password_hash(self.password_hash, sanitized_password)
def pull_avatar(self, size):
digest = md5(self.email.lower().encode('utf-8')).hexdigest()
return f"https://www.gravatar.com/avatar/{digest}?d=identicon&s={size}"
def set_password(self, sanitized_password): # upon register
self.password_hash = generate_password_hash(sanitized_password)
def timestamp_on_request(self): # time stamp to update last_visited in db upon request of any page
self.last_visited = datetime.utcnow()
# db.session.add(self)
db.session.commit()
def follow(self, user):
if not self.is_following(user):
self.followed.append(user) # follow the target user
# db.session.commit()
def unfollow(self, user):
if self.is_following(user):
self.followed.remove(user)
def is_following(self, user):
return self.followed.filter(followers.c.followed_id == user.id).count() > 0
def followed_posts(self):
followed = Post.query.join(
followers, (followers.c.followed_id == Post.user_id)
).filter(followers.c.follower_id == self.id)
return followed.union(self.posts).order_by(Post.timestamp.desc())
def get_reset_password_token(self, expires_in=600):
return jwt.encode(
{'reset_password': self.id, 'exp': time() + expires_in}, # user id as payload
app.config['SECRET_KEY'], algorithm='HS256').decode('utf-8')
@staticmethod
def verify_reset_password_token(token):
try:
decoded_token_dict = jwt.decode(token, app.config['SECRET_KEY'], algorithms=['HS256'])
id = decoded_token_dict['reset_password']
except Exception as some_exception:
return None
return User.query.get(id)
def new_messages(self):
last_read_time = self.last_message_read_time or datetime(1900, 1, 1)
return Message.query.filter_by(recipient=self).filter(
Message.timestamp > last_read_time).count()
def add_notification(self, name, data):
self.notifications.filter_by(name=name).delete()
n = Notification(name=name, payload_json=json.dumps(data), user=self)
db.session.add(n)
return n
@classmethod
def reindex(cls):
for obj in cls.query:
add_to_index(cls.__tablename__, obj)
# db signal handling for text search
db.event.listen(db.session, 'before_commit', SearchableMixin.before_commit)
db.event.listen(db.session, 'after_commit', SearchableMixin.after_commit)
# strong entity
followers = db.Table(
'followers',
db.Column('follower_id', db.Integer, db.ForeignKey('user.id')),
db.Column('followed_id', db.Integer, db.ForeignKey('user.id'))
)
class User(UserMixin, db.Model): # UserMixin makes model compatible with flask-login
id = db.Column(db.Integer, primary_key=True) # flask login writes User.id to session
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))
posts = db.relationship('Post', backref='author', lazy='dynamic')
about_me = db.Column(db.String(140))
last_visited = db.Column(db.DateTime, default=datetime.utcnow())
followed = db.relationship(
'User', secondary=followers,
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))
posts = db.relationship('Post', backref='author', lazy='dynamic')
about_me = db.Column(db.String(140))
last_seen = db.Column(db.DateTime, default=datetime.utcnow)
followed = db.relationship('User',
secondary=followers,
primaryjoin=(followers.c.follower_id == id),
secondaryjoin=(followers.c.followed_id == id),
backref=db.backref('followers', lazy='dynamic'),
lazy='dynamic')
def __repr__(self):
return '<User {}>'.format(self.username)
def set_password(self, password):
self.password_hash = generate_password_hash(password)
def check_password(self, password):
return check_password_hash(self.password_hash, password)
def avatar(self, size):
digest = md5(self.email.lower().encode('utf-8')).hexdigest()
return 'https://www.gravatar.com/avatar/{}?d=mp&s={}'.format(
digest, size)
def follow(self, user):
if not self.is_following(user):
self.followed.append(user)
def unfollow(self, user):
if self.is_following(user):
self.followed.remove(user)
def is_following(self, user):
return self.followed.filter(
followers.c.followed_id == user.id).count() > 0
def followed_posts(self):
followed = Post.query.join(
followers, (followers.c.followed_id == Post.user_id)).filter(
followers.c.follower_id == self.id)
own = Post.query.filter_by(user_id=self.id)
return followed.union(own).order_by(Post.timestamp.desc())
def get_reset_password_token(self, expires_in=600):
return jwt.encode(
{
'reset_password': self.id,
'exp': time() + expires_in
},
app.config['SECRET_KEY'],
algorithm='HS256').decode('utf-8')
@staticmethod
def verify_reset_password_token(token):
try:
id = jwt.decode(token,
app.config['SECRET_KEY'],
algorithms=['HS256'])['reset_password']
except:
return
return User.query.get(id)