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)