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pymongo find_and_modify not honoring sort?
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Zac Witte  
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 More options Dec 14 2011, 7:21 pm
From: Zac Witte <zacwi...@gmail.com>
Date: Wed, 14 Dec 2011 16:21:44 -0800 (PST)
Local: Wed, Dec 14 2011 7:21 pm
Subject: pymongo find_and_modify not honoring sort?
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I'm I missing something here?

ubuntu@mongo1:~/pubnub-analytics$ python
Python 2.7.1+ (r271:86832, Apr 11 2011, 18:13:53)
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

>>> from pymongo import Connection
>>> from pymongo import ASCENDING, DESCENDING
>>> conn = Connection()
>>> db = conn.pb2
>>> db.log_files.find_and_modify(

...     query={'status':'unprocessed'},
...     update={'$set':{}},
...     sort=[('file_name',ASCENDING)],
...     new=True)
{u'status': u'unprocessed', u'file_name':
u'2011-12-03_23:04:34.288091_50.18.36.76.log.bz2', u'_id':
ObjectId('4ee805931d011c644f003260')}
>>> db.log_files.find_one({'status':'unprocessed'})

{u'status': u'unprocessed', u'file_name':
u'2011-12-03_23:04:34.288091_50.18.36.76.log.bz2', u'_id':
ObjectId('4ee805931d011c644f003260')}
>>> db.log_files.find_one({'status':'unprocessed'}, sort=[('file_name',ASCENDING)])

{u'status': u'unprocessed', u'file_name':
u'2011-09-30_10:48:23.843037_46.137.255.217.log', u'_id':
ObjectId('4ee805981d011c644f00916c'), u'end_time':
datetime.datetime(2011, 12, 14, 2, 35, 52, 160000)}

 
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Zac Witte  
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 More options Dec 14 2011, 9:37 pm
From: Zac Witte <zacwi...@gmail.com>
Date: Wed, 14 Dec 2011 18:37:01 -0800 (PST)
Local: Wed, Dec 14 2011 9:37 pm
Subject: Re: pymongo find_and_modify not honoring sort?
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I should maybe clarify - the code I pasted shows me doing the
following:

1) find_and_modify while sorting by file_name and it returning a
file_name starting with 2011-12-03
2) a normal find with the same query, but without the sort returning
the same file_name starting with 2011-12-03
3) a find with the same query and WITH the sort and returning
2011-09-30.

2011-09-30 is what SHOULD be returned when sorting, but 2011-12-03 is
what is returned without sorting. 2011-12-03 is what is returned
during a find_and_modify (or update) even though I include the sort
parameter. Am I doing the sort wrong or could there be some other
issue involved?

Thanks,

On Dec 14, 4:21 pm, Zac Witte <zacwi...@gmail.com> wrote:


 
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Nat  
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 More options Dec 14 2011, 10:14 pm
From: Nat <nat.lu...@gmail.com>
Date: Wed, 14 Dec 2011 19:14:20 -0800 (PST)
Local: Wed, Dec 14 2011 10:14 pm
Subject: Re: pymongo find_and_modify not honoring sort?
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- What mongod version? If it's 1.6.x, I remember that there was a bug
related to that
- Do you have an index on filename, status?
- Can you do explain() on the query?


 
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Bernie Hackett  
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 More options Dec 14 2011, 11:48 pm
From: Bernie Hackett <ber...@10gen.com>
Date: Wed, 14 Dec 2011 20:48:35 -0800 (PST)
Local: Wed, Dec 14 2011 11:48 pm
Subject: Re: pymongo find_and_modify not honoring sort?
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sort={'file_name': ASCENDING} will work.

On Dec 14, 4:21 pm, Zac Witte <zacwi...@gmail.com> wrote:


 
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Zac Witte  
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 More options Dec 15 2011, 12:57 am
From: Zac Witte <zacwi...@gmail.com>
Date: Wed, 14 Dec 2011 21:57:38 -0800 (PST)
Local: Thurs, Dec 15 2011 12:57 am
Subject: Re: pymongo find_and_modify not honoring sort?
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Thanks Bernie, that did the trick. I think the documentation could use
some fixing, since there's no indication of a different syntax from
the find command and there's no OperationFailure thrown when the wrong
parameter is supplied.

Zac

On Dec 14, 8:48 pm, Bernie Hackett <ber...@10gen.com> wrote:


 
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Nat  
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 More options Dec 15 2011, 1:18 am
From: Nat <nat.lu...@gmail.com>
Date: Wed, 14 Dec 2011 22:18:00 -0800 (PST)
Subject: Re: pymongo find_and_modify not honoring sort?
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I think it should take key_or_list just like find() since the order of the
sorting actually matters, right? Especially, if you have more than one
sorting order.


 
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Walter Woods  
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 More options Sep 25 2012, 10:18 pm
From: Walter Woods <woodswal...@gmail.com>
Date: Tue, 25 Sep 2012 19:18:08 -0700 (PDT)
Local: Tues, Sep 25 2012 10:18 pm
Subject: Re: pymongo find_and_modify not honoring sort?
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Just want to vote in support that this should be fixed to take
key_or_list... after all, a dict in python can change sort after the
definition, so something like { 'b': 1, 'a': -1 } would end up sorting on
'a' descending BEFORE 'b' ascending, which isn't what would be intended.


 
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Bernie Hackett  
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 More options Sep 26 2012, 7:39 am
From: Bernie Hackett <ber...@10gen.com>
Date: Wed, 26 Sep 2012 07:39:31 -0400
Local: Wed, Sep 26 2012 7:39 am
Subject: Re: [mongodb-user] Re: pymongo find_and_modify not honoring sort?
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You can use either son.SON (supported back to python 2.4) or
collections.OrderedDict for this.

http://api.mongodb.org/python/current/api/bson/son.html#bson.son.SON

http://docs.python.org/library/collections.html#collections.OrderedDict


 
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aliane abdelouahab  
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 More options Sep 26 2012, 7:43 am
From: aliane abdelouahab <alabdeloua...@gmail.com>
Date: Wed, 26 Sep 2012 04:43:19 -0700 (PDT)
Local: Wed, Sep 26 2012 7:43 am
Subject: Re: pymongo find_and_modify not honoring sort?
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