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  2. Traceback (most recent call last)
  3. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1994, in __call__
  4. return self.wsgi_app(environ, start_response)
  5. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
  6. response = self.handle_exception(e)
  7. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception
  8. reraise(exc_type, exc_value, tb)
  9. File "/usr/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
  10. raise value
  11. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
  12. response = self.full_dispatch_request()
  13. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
  14. rv = self.handle_user_exception(e)
  15. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
  16. reraise(exc_type, exc_value, tb)
  17. File "/usr/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
  18. raise value
  19. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
  20. rv = self.dispatch_request()
  21. File "/usr/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
  22. return self.view_functions[rule.endpoint](**req.view_args)
  23. File "/home/quechon/PycharmProjects/untitled3/myapp/login/routes.py", line 66, in _register_process
  24. timecreated=datetime.datetime.utcnow()
  25. File "<string>", line 4, in __init__
  27. File "/usr/lib/python3.6/site-packages/sqlalchemy/orm/state.py", line 414, in _initialize_instance
  28. manager.dispatch.init_failure(self, args, kwargs)
  29. File "/usr/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
  30. compat.reraise(exc_type, exc_value, exc_tb)
  31. File "/usr/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
  32. raise value
  33. File "/usr/lib/python3.6/site-packages/sqlalchemy/orm/state.py", line 411, in _initialize_instance
  34. return manager.original_init(*mixed[1:], **kwargs)
  35. File "/home/quechon/PycharmProjects/untitled3/myapp/models.py", line 80, in __init__
  36. self.follow(self)
  37. File "/home/quechon/PycharmProjects/untitled3/myapp/models.py", line 47, in follow
  38. if not self.is_following(user):
  39. File "/home/quechon/PycharmProjects/untitled3/myapp/models.py", line 57, in is_following
  40. return self.followed.filter_by(followed_id=user.id).first() is not None
  41. File "/usr/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 1517, in filter_by
  42. return self.filter(sql.and_(*clauses))
  43. File "<string>", line 2, in filter
  45. File "/usr/lib/python3.6/site-packages/sqlalchemy/orm/base.py", line 198, in generate
  46. self = args[0]._clone()
  47. File "/usr/lib/python3.6/site-packages/sqlalchemy/orm/dynamic.py", line 278, in _clone
  48. orm_util.instance_str(instance), self.attr.key))
  49. sqlalchemy.orm.exc.DetachedInstanceError: Parent instance <User at 0x7fe2ac0e6e80> is not bound to a Session, and no contextual session is established; lazy load operation of attribute 'followed' cannot proceed
  55. class User(db.Model):
  57. __tablename__ = 'user'
  59. id = db.Column(db.Integer, primary_key=True)
  60. username = db.Column(db.String(100), unique=True)
  61. email = db.Column(db.String(100))
  62. password = db.Column(db.Binary)
  63. profilepic = db.Column(db.String)
  64. timecreated = db.Column(db.DateTime)
  66. #picture = db.relationship('Picture', backref='owner', lazy='dynamic')
  67. comment = db.relationship('Comment', backref='user', lazy='dynamic')
  68. post = db.relationship('Post', backref='user', lazy='dynamic')
  70. followed = db.relationship('Follow', foreign_keys=[Follow.follower_id],
  71. backref=db.backref('follower', lazy='joined'),
  72. lazy='dynamic',
  73. cascade='all, delete-orphan')
  74. followers = db.relationship('Follow',
  75. foreign_keys=[Follow.followed_id],
  76. backref=db.backref('followed', lazy='joined'),
  77. lazy='dynamic',
  78. cascade='all, delete-orphan')
  80. def follow(self, user):
  81. if not self.is_following(user):
  82. f = Follow(follower=self, followed=user)
  83. db.session.add(f)
  85. def unfollow(self, user):
  86. f = self.followed.filter_by(followed_id=user.id).first()
  87. if f:
  88. db.session.delete(f)
  90. def is_following(self, user):
  91. return self.followed.filter_by(followed_id=user.id).first() is not None
  93. def is_followed_by(self, user):
  94. return self.followers.filter_by(follower_id=user.id).first() is not None
  96. @property
  97. def followed_posts(self):
  98. return Post.query.join(Follow.followed_id == Post.user_id)\
  99. .filter(Follow.follower_id == self.id)
  101. def is_authenticated(self):
  102. return True
  104. def is_active(self):
  105. return True
  107. def is_anonymous(self):
  108. return False
  110. def get_id(self):
  111. return str(self.id)
  113. def __init__(self, **kwargs):
  114. self.follow(self)
  116. def __repr__(self):
  117. return f'<id - {self.id} | - {self.username}>'
  118.  
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