PyMongo 3 compatibility

[ajdavis]

"auto_start_request" option is gone, "max_pool_size" renamed to "maxPoolSize", "safe" is gone, "_connect" is renamed "connect".

[atuljain]

i am also getting errro while using syncdb , and i can't able to work with mongoDB , any help, how can i solve it

I was following the instructions from this site and am now encountering issues I believe are related.
https://django-mongodb-engine.readthedocs.org/en/latest/topics/setup.html

(djangotest):~/develop/djangotest/djangotest$ ./manage.py syncdb
ConfigurationError: Unknown option auto_start_request
(djangotest):~/develop/djangotest/djangotest$ ./manage.py syncdb
ConfigurationError: Unknown option safe
(djangotest):~/develop/djangotest/djangotest$ ./manage.py syncdb
ConfigurationError: Unknown option _connect
(djangotest):~/develop/djangotest/djangotest$ ./manage.py syncdb
ConfigurationError: Unknown option max_pool_size
(djangotest):~/develop/djangotest/djangotest$ ./manage.py syncdb
Creating tables ...
TypeError: __init__() got an unexpected keyword argument 'fields'
Exception AttributeError: "'DebugCursor' object has no attribute '_Cursor__id'" in <bound method DebugCursor.__del__ of <django_mongodb_engine.utils.DebugCursor object at 0x7f693c021590>> ignored

while attempting to circumvent by modifying django_mongodb_engine/base.py:

        conn_options = dict(
            host=host,
            port=int(port),
#            max_pool_size=None,
            document_class=dict,
            tz_aware=False,
#            _connect=True,
#            auto_start_request=True,
#            safe=False

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/commands/syncdb.py", line 112, in handle_noargs
    emit_post_sync_signal(created_models, verbosity, interactive, db)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/core/management/sql.py", line 216, in emit_post_sync_signal
    interactive=interactive, db=db)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/dispatch/dispatcher.py", line 185, in send
    response = receiver(signal=self, sender=sender, **named)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/contrib/auth/management/__init__.py", line 93, in create_permissions
    'content_type', 'codename')[:1000000]:
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/db/models/query.py", line 96, in __iter__
    self._fetch_all()
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/db/models/query.py", line 857, in _fetch_all
    self._result_cache = list(self.iterator())
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django/db/models/query.py", line 1071, in iterator
    for row in self.query.get_compiler(self.db).results_iter():
  File "~/develop/djangotest/local/lib/python2.7/site-packages/djangotoolbox/db/basecompiler.py", line 380, in results_iter
    for entity in results:
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django_mongodb_engine/compiler.py", line 104, in fetch
    results = self.get_cursor()
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django_mongodb_engine/compiler.py", line 139, in get_cursor
    cursor = self.collection.find(self.mongo_query, fields=fields)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django_mongodb_engine/utils.py", line 75, in find
    return DebugCursor(self, self.collection, *args, **kwargs)
  File "~/develop/djangotest/local/lib/python2.7/site-packages/django_mongodb_engine/utils.py", line 100, in __init__
    super(DebugCursor, self).__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'fields'
Exception AttributeError: "'DebugCursor' object has no attribute '_Cursor__id'" in <bound method DebugCursor.__del__ of <django_mongodb_engine.utils.DebugCursor object at 0x3097290>> ignored

Versions:
MongoDB 2.4.5
Python 2.7.5+
Django-1.5.11-py2.7
pymongo-3.0.1-py2.7
django_mongodb_engine-0.5.2-py2.7
djangotoolbox-1.6.2-py2.7

Is there something I'm missing?

[ajdavis]

Cursor's "fields" argument was renamed "projection" in PyMongo 3:

https://github.com/mongodb/mongo-python-driver/blob/3.0.1/pymongo/cursor.py#L101

The change was made to match the new CRUD API spec that unifies argument names among all MongoDB drivers (Java, C++, etc. etc.).

An irritating quirk of Python is that object destructors run, even if the constructor couldn't be called due to an argument error. So in this case the Cursor.__id attribute was never set because the constructor wasn't called, but the destructor tries to access it anyway.

Short story: once we deal with the test failures, part of upgrading django_mongodb_engine to PyMongo 3 will be replacing the "fields" argument name with "projection" when creating a Cursor.

[sreenathramu]

Exception AttributeError: "'DebugCursor' object has no attribute '_Cursor__id'"

Is there any way to clear the error?
Versions:
Pymongo-3.0.2
django_mongodb_engine-0.5.2-py2.7
djangotoolbox-1.6.2-py2.7

[jayachandp]

Try installing older stable version of Pymongo

[markunsworth]

Yes. You need to fix your pymongo version to be

pymongo<3.0

There's a fix for this in #213

On Friday, June 19, 2015, jayachandp notifications@github.com wrote:

Try installing older stable version of Pymongo

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[markunsworth]

You can close this one out now.

Fixed in #214

[ajdavis]

Thanks for picking this up Mark!