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Operating System:
ALL
Steps To Reproduce:
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Start with a record:

{ "_id" : ObjectId("53c7cf02449a3606a7037755"), "guid" : NumberLong("279172874564"), "region_id" : "US"}

Call update on the collection (this example is in python)

collection.update({'guid': 279172874564}, {}, safe=True, w=1, wtimeout=250)

Observe that the record has now been cleared.

{ "_id" : ObjectId("53c7cf02449a3606a7037755") }

The expected behavior is that this is treated as a no-op.
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Start with a record: { "_id" : ObjectId("53c7cf02449a3606a7037755"), "guid" : NumberLong("279172874564"), "region_id" : "US"} Call update on the collection (this example is in python) collection.update({'guid': 279172874564}, {}, safe=True, w=1, wtimeout=250) Observe that the record has now been cleared. { "_id" : ObjectId("53c7cf02449a3606a7037755") } The expected behavior is that this is treated as a no-op.

mongo 2.6.1
pymongo 2.5.1

Calling Collection.update with an empty dictionary will delete all but the _id field.