modify
Event
On this page
Summary
modify
New in version 6.0.
A
modify
event occurs when a collection is modified, such as when thecollMod
command adds or remove options from a collection or view. This event is received only if the change stream has the showExpandedEvents option set totrue
.Note
Disambiguation
To learn more about events that occur when individual documents are updated, see the
update
event.
Description
Field | Type | Description | |||
---|---|---|---|---|---|
| Document | A BSON object which serves as an identifier for the
change stream event. This value is used as the
The For an example of resuming a change stream by | |||
| Timestamp |
Due to oplog size limits,
multi-document transactions may create multiple
oplog entries. In a transaction, change stream events staged in a given oplog
entry share the same On sharded clusters, events with the same To identify events for a single transaction, you can use the
combination of | |||
| UUID | If the change occurred on a collection, New in version 6.0. | |||
| document | The identifier for the session associated with the transaction. Only present if the operation is part of a multi-document transaction. | |||
| document | The namespace (database and or collection) affected by the event. | |||
| string | The name of the database where the event occurred. | |||
| string | The name of the collection where the event occurred. | |||
| document | Additional information on the change operation. This document and its subfields only appears when the change stream uses expanded events. New in version 6.0. | |||
operationDescription. index | document | The index that was modified. New in version 6.0. | |||
operationDescription. indexes | array | An array of documents listing the indexes that were changed by the operation. | |||
| string | The type of operation that the change notification reports. Returns a value of | |||
| document | Document shows collection and index options before the operation changed them. | |||
stateBeforeChange. collectionOptions | document | Document shows collection options before the operation changed them. | |||
stateBeforeChange. indexOptions | document | Document shows index options before the operation changed them. | |||
| NumberLong | Together with the lsid, a number that helps uniquely identify a transction. Only present if the operation is part of a multi-document transaction. | |||
| The server date and time of the database operation. New in version 6.0. |
Example
The following example shows a modify
event:
{ "_id": { <ResumeToken> }, "operationType": "modify", "clusterTime": Timestamp({ t: 1654878543, i: 1 }), "collectionUUID": UUID("47d6baac-eeaa-488b-98ae-893f3abaaf25"), "wallTime": ISODate("2022-06-10T16:29:03.704Z"), "ns": { "db": "test", "coll": "authors" }, "operationDescription": { "index": { "name": "age_1", "hidden": true } }, "stateBeforeChange": { "collectionOptions": { "uuid": UUID("47d6baac-eeaa-488b-98ae-893f3abaaf25") }, "indexOptions": { "hidden": false } } }