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models.py
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models.py
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"""SQLAlchemy models for Warbler."""
from datetime import datetime
from flask_bcrypt import Bcrypt
from flask_sqlalchemy import SQLAlchemy
bcrypt = Bcrypt()
db = SQLAlchemy()
class Follows(db.Model):
"""Connection of a follower <-> followed_user."""
__tablename__ = 'follows'
user_being_followed_id = db.Column(
db.Integer,
db.ForeignKey('users.id', ondelete="cascade"),
primary_key=True,
)
user_following_id = db.Column(
db.Integer,
db.ForeignKey('users.id', ondelete="cascade"),
primary_key=True,
)
class Likes(db.Model):
"""Mapping user likes to warbles."""
__tablename__ = 'likes'
id = db.Column(
db.Integer,
primary_key=True
)
user_id = db.Column(
db.Integer,
db.ForeignKey('users.id', ondelete='cascade')
)
message_id = db.Column(
db.Integer,
db.ForeignKey('messages.id', ondelete='cascade'),
unique=True
)
class User(db.Model):
"""User in the system."""
__tablename__ = 'users'
id = db.Column(
db.Integer,
primary_key=True,
)
email = db.Column(
db.Text,
nullable=False,
unique=True,
)
username = db.Column(
db.Text,
nullable=False,
unique=True,
)
image_url = db.Column(
db.Text,
default="/static/images/default-pic.png",
)
header_image_url = db.Column(
db.Text,
default="/static/images/warbler-hero.jpg"
)
bio = db.Column(
db.Text,
)
location = db.Column(
db.Text,
)
password = db.Column(
db.Text,
nullable=False,
)
messages = db.relationship('Message')
followers = db.relationship(
"User",
secondary="follows",
primaryjoin=(Follows.user_being_followed_id == id),
secondaryjoin=(Follows.user_following_id == id)
)
following = db.relationship(
"User",
secondary="follows",
primaryjoin=(Follows.user_following_id == id),
secondaryjoin=(Follows.user_being_followed_id == id)
)
likes = db.relationship(
'Message',
secondary="likes"
)
def __repr__(self):
return f"<User #{self.id}: {self.username}, {self.email}>"
def is_followed_by(self, other_user):
"""Is this user followed by `other_user`?"""
found_user_list = [user for user in self.followers if user == other_user]
return len(found_user_list) == 1
def is_following(self, other_user):
"""Is this user following `other_use`?"""
found_user_list = [user for user in self.following if user == other_user]
return len(found_user_list) == 1
@classmethod
def signup(cls, username, email, password, image_url):
"""Sign up user.
Hashes password and adds user to system.
"""
hashed_pwd = bcrypt.generate_password_hash(password).decode('UTF-8')
user = User(
username=username,
email=email,
password=hashed_pwd,
image_url=image_url,
)
db.session.add(user)
return user
@classmethod
def authenticate(cls, username, password):
"""Find user with `username` and `password`.
This is a class method (call it on the class, not an individual user.)
It searches for a user whose password hash matches this password
and, if it finds such a user, returns that user object.
If can't find matching user (or if password is wrong), returns False.
"""
user = cls.query.filter_by(username=username).first()
if user:
is_auth = bcrypt.check_password_hash(user.password, password)
if is_auth:
return user
return False
class Message(db.Model):
"""An individual message ("warble")."""
__tablename__ = 'messages'
id = db.Column(
db.Integer,
primary_key=True,
)
text = db.Column(
db.String(140),
nullable=False,
)
timestamp = db.Column(
db.DateTime,
nullable=False,
default=datetime.utcnow(),
)
user_id = db.Column(
db.Integer,
db.ForeignKey('users.id', ondelete='CASCADE'),
nullable=False,
)
user = db.relationship('User')
def connect_db(app):
"""Connect this database to provided Flask app.
You should call this in your Flask app.
"""
db.app = app
db.init_app(app)