class Message(db.Model):
id = db.Column(db.Integer, primary_key=True)
sender_id = db.Column(db.Integer, db.ForeignKey('user.id'))
recipient_id = db.Column(db.Integer, db.ForeignKey('user.id'))
body = db.Column(db.String(140))
timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
def __repr__(self):
return '<Message {}>'.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
@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,