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- db.collection.updateMany()
db.collection.updateMany()¶
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Definition¶
-
db.collection.
updateMany
(filter, update, options)¶ New in version 3.2.
Updates multiple documents within the collection based on the filter.
The
updateMany()
method has the following form:The
updateMany()
method takes the following parameters:Parameter Type Description filter
document The selection criteria for the update. The same query selectors as in the
find()
method are available.Specify an empty document
{ }
to update all documents in the collection.update
document The modifications to apply.
Use Update Operators such as
$set
,$unset
, or$rename
.Using the update() pattern of
field: value
for theupdate
parameter throws an error.upsert
boolean Optional. When
true
,updateMany()
either:- Creates a new document if no documents match the
filter
. For more details see upsert behavior. - Updates documents that match the
filter
.
To avoid multiple upserts, ensure that the
filter
fields are uniquely indexed.Defaults to
false
.writeConcern
document Optional. A document expressing the write concern. Omit to use the default write concern. Returns: A document containing: - A boolean
acknowledged
astrue
if the operation ran with write concern orfalse
if write concern was disabled matchedCount
containing the number of matched documentsmodifiedCount
containing the number of modified documentsupsertedId
containing the_id
for the upserted document
- Creates a new document if no documents match the
Behavior¶
updateMany()
updates all matching documents in
the collection that match the filter
, using the update
criteria
to apply modifications.
If upsert: true
and no documents match the filter
,
updateMany()
creates a new
document based on the filter
and update
parameters. See
Update Multiple Documents with Upsert.
Capped Collections¶
If an update operation changes the document size, the operation will fail.
Examples¶
Update Multiple Documents¶
The restaurant
collection contains the following documents:
The following operation updates all documents where violations
are
greater than 4
and $set
a flag for review:
The operation returns:
The collection now contains the following documents:
If no matches were found, the operation instead returns:
Setting upsert: true
would insert a document if no match was found.
Update Multiple Documents with Upsert¶
The inspectors
collection contains the following documents:
The following operation updates all documents with Sector
greater
than 4 and inspector
equal to "R. Coltrane"
:
The operation returns:
The collection now contains the following documents:
Since no documents matched the filter, and upsert
was true
,
updateMany
inserted the document with a
generated _id
, the equality conditions from the filter
, and the
update
modifiers.
Update with Write Concern¶
Given a three member replica set, the following operation specifies a
w
of majority
and wtimeout
of 100
:
If the acknowledgement takes longer than the wtimeout
limit, the following
exception is thrown:
The wtimeout
error only indicates that the operation did not complete on
time. The write operation itself can still succeed outside of the set time
limit.