I am creating a system where users can subscribe to one-another.
This is my current code:
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.sql.schema import Column, ForeignKey
from sqlalchemy.sql.sqltypes import BigInteger, String, Integer, TIMESTAMP
Base = declarative_base()
engine = None
session = None
class User(Base):
__tablename__ = 'users'
id = Column(BigInteger, primary_key=True)
email = Column(String(100), nullable=False)
displayname = Column(String(255), nullable=False)
password = Column(String(80), nullable=False)
uhash = Column(String(80), nullable=False)
verified = Column(Integer, nullable=False)
registerdate = Column(TIMESTAMP, nullable=True)
def __init__(self, email, password, displayname, uhash, verified,
registerdate):
self.email = email
self.password = password
self.displayname = displayname
self.uhash = uhash
self.verified = verified
self.registerdate = registerdate
def __repr__(self):
return "User(%s, %s, %s, %s)" % (self.email, self.password,
self.displayname, self.verified)
class Video(Base):
__tablename__ = 'videos'
id = Column(BigInteger, primary_key=True)
name = Column(String(255))
def __init__(self, name):
self.name = name
class UserSubscription(Base):
__tablename__ = 'usersubscriptions'
id = Column(BigInteger, primary_key=True)
subscriber_id = Column("subscriber_id", BigInteger,
ForeignKey("users.id"))
subscriber = relationship("User", backref="subsciptions",
primaryjoin=(User.id == subscriber_id))
subscribed_id = Column("subscribed_id", BigInteger,
ForeignKey("users.id"))
subscribed = relationship("User", backref="subscribers",
primaryjoin=(User.id == subscribed_id))
def __init__(self, subscriber, subscribed):
self.subscriber = subscriber
self.subscribed = subscribed
def setup_mysqldb(uri):
engine = create_engine(uri)
session = sessionmaker()
session.configure(bind=engine)
Base.metadata.create_all(engine)
return session()
Whenever I start up my Flask server (that uses this), it produces this
error:
Traceback (most recent call last):
File
"/home/midnightas/.p2/pool/plugins/org.python.pydev_5.1.2.201606231256/pysrc/_pydevd_bundle/pydevd_reload.py",
line 345, in _update
if oldobj != newobj and str(oldobj) != str(newobj) and repr(oldobj) !=
repr(newobj):
File
"/usr/local/lib/python3.4/dist-packages/sqlalchemy/sql/operators.py", line
310, in __ne__
return self.operate(ne, other)
File
"/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/attributes.py", line
175, in operate
return op(self.comparator, *other, **kwargs)
File
"/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/relationships.py",
line 1333, in __ne__
return _orm_annotate(self.__negated_contains_or_equals(other))
File
"/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/relationships.py",
line 1245, in __negated_contains_or_equals
state = attributes.instance_state(other)
File
"/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/attributes.py", line
193, in __getattr__
key)
AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator'
object associated with UserSubscription.subscribed has an attribute
'_sa_instance_state'
What did I do wrong in UserSubscription?
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