Migration Value Error

[nadermx]

I'm trying to start a new project wit the migrations feature.

I currently have a models.py file that looks like such

# -*- coding: utf-8 -*-
from flask import current_app
from datetime import datetime
from pony.orm import *
from passlib.hash import bcrypt_sha256
from itsdangerous import (TimedJSONWebSignatureSerializer as Serializer, BadSignature, SignatureExpired)
from flask_login import UserMixin

db = Database()

class User(UserMixin, db.Entity):
    username = Optional(unicode, unique=True)
    password_hash = Optional(unicode)
    email = Required(unicode)
    dt_registered = Optional(datetime, default=datetime.utcnow())
    dt_last_visit = Optional(datetime, default=datetime.utcnow())
    verified = Optional(bool, default=False)
    failed_login = Optional(int)
    last_failed_login = Optional(datetime, default=datetime.now)
    questions = Set(lambda: Question)
    answers = Set(lambda: Answer)
    votes = Set(lambda: Vote)
    comments = Set(lambda: Comment)
    info = Optional(Json)
    favorites = Optional(lambda: Favorite)
    tags = Optional(lambda: Tag)
    reputation = Optional(lambda: Reputation)
    status = Optional(bool)
    moderator = Optional(unicode)

    def hash_password(self, password):
        self.password_hash = bcrypt_sha256.hash(password)

    def verify_password(self, password):
        return bcrypt_sha256.verify(password, self.password_hash)

    @staticmethod
    def verify_auth_token(token):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except SignatureExpired:
            return None  # valid token, but expired
        except BadSignature:
            return None  # invalid token
        if not data['id']:
            return None
        user = User[data['id']]
        return user

class Comment(db.Entity):
    user = Required(lambda: User)
    question = Optional(lambda: Question)
    answer = Optional(lambda: Answer)
    votes = Optional(lambda: Vote)

class Question(db.Entity):
    content = Optional(unicode)
    user = Required(lambda: User)
    views = Optional(int)
    comments = Set(lambda: Comment)
    answers = Set(lambda: Answer)
    votes = Set(lambda: Vote)

class Answer(db.Entity):
    votes = Set(lambda: Vote)
    user = Required(lambda: User)
    comments = Set(lambda: Comment)
    question = Optional(lambda: Question)
    correct = Optional(bool, default=False)

class Tag(db.Entity):
    user = Required(lambda: User)

class Vote(db.Entity):
    user = Required(lambda: User)
    answer = Optional(lambda: Answer)
    question = Optional(lambda: Question)
    comment = Optional(lambda: Comment)
    content = Optional(unicode)


class Reputation(db.Entity):
    user = Required(lambda: User)

class Favorite(db.Entity):
    user = Required(lambda: User)

sql_debug(False)

Then in my app.py I have the following (Noting that it's a new database so i don't need to run models.db.generate_mapping(allow_auto_upgrade=True) or models.db.generate_mapping(create_tables=True)?

app.config.from_object('config')
# set a global db session for the app
app.wsgi_app = models.db_session(app.wsgi_app)
models.db.bind(app.config['DB_PROVIDER'], **app.config['DB_CONFIG'])

This works when I run my app.py. But when I try and run the migrate.py file that I have set up as following

#!/usr/bin/env python
import models
import config

models.db.migrate(config.DB_PROVIDER, **config.DB_CONFIG)

note my config.py file has the following

DB_PROVIDER = 'sqlite'
DB_CONFIG = {
  'filename': 'db.sqlite',
  'create_db': True,
}

I run python migrate.py make and I get

Traceback (most recent call last):
  File "migrate.py", line 5, in <module>
    models.db.migrate(config.DB_PROVIDER, **config.DB_CONFIG)
  File "<string>", line 2, in migrate
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/utils/utils.py", line 58, in cut_traceback
    return func(*args, **kwargs)
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/orm/core.py", line 682, in migrate
    return migrate(self, command)
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/command.py", line 61, in migrate
    return _migrate(db, cmd, **kwargs)
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/command.py", line 96, in _migrate
    return graph.make(db=db, empty=empty, custom=custom, description=name)
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/migration.py", line 228, in make
    generated = MigrationWriter(leaves, None, db).as_string()
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/writer.py", line 347, in as_string
    body = self._get_define_entities_block(imports)
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/writer.py", line 323, in _get_define_entities_block
    entities.append(serialize_entity_declaration(entity, imports=imports))
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/serializer.py", line 30, in serialize_entity_declaration
    return serializer.serialize_entity_declaration(entity)
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/serializer.py", line 148, in serialize_entity_declaration
    lines.append('%s = %s' % (name, self.serialize(value)))
  File "/home/john/.virtualenvs/ca/lib/python3.6/site-packages/pony/migrate/serializer.py", line 245, in serialize
    raise ValueError
ValueError

[kozlovsky]

Thanks for reporting, should be fixed now

[jgirardet]

I had the same errors. I updated today with latest git version, andnow I have the same error message but with one line more :

Traceback (most recent call last):
  File "migrate2.py", line 19, in <module>
    db.migrate(**db_params, migration_dir='mapistar/migrations')
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/orm/core.py", line 684, in migrate
    return migrate(self, command)
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/command.py", line 61, in migrate
    return _migrate(db, cmd, **kwargs)
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/command.py", line 96, in _migrate
    return graph.make(db=db, empty=empty, custom=custom, description=name)
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/migration.py", line 228, in make
    generated = MigrationWriter(leaves, None, db).as_string()
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/writer.py", line 347, in as_string
    body = self._get_define_entities_block(imports)
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/writer.py", line 323, in _get_define_entities_block
    entities.append(serialize_entity_declaration(entity, imports=imports))
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/serializer.py", line 30, in serialize_entity_declaration
    return serializer.serialize_entity_declaration(entity)
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/serializer.py", line 149, in serialize_entity_declaration
    lines.append('%s = %s' % (name, self.serialize(value)))
  File "/home/jim/.local/share/virtualenvs/mapistar-u3z0Ka1e/src/pony/pony/migrate/serializer.py", line 246, in serialize
    raise TypeError(type(value))
TypeError: <class 'descriptors.classproperty'>