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Type:
Improvement
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: None
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Component/s: None
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Environment:debian 7 (Wheezy) mongodb 2.4.10
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I understand why one would appreciate $pull success whether or not the item was actually pulled (since the effect is the same), but it would be nice to be able to determine if something was removed/if the document was changed.
> db.test.findOne({})
{
"_id" : ObjectId("53a9e45a9593e7fb44ad0aae"),
"credits" : [
"11111",
"22222",
"33333"
]
}
>>> x = db.test.update({'_id': ObjectId("53a9e45a9593e7fb44ad0aae")},{'$pull': {'test': '2222'}})
>>> x
{u'updatedExisting': True, u'connectionId': 7, u'ok': 1.0, u'err': None, u'n': 1}
>>> x = db.test.update({'_id': ObjectId("53a9e45a9593e7fb44ad0aae")},{'$pull': {'test': '2222'}})
>>> x
{u'updatedExisting': True, u'connectionId': 7, u'ok': 1.0, u'err': None, u'n': 1}
If some field:value could be added, such as
{'documentChanged': True}, then one could programmatically determine if a $pull query has made any modifications to the document.