pabloem commented on a change in pull request #14927:
URL: https://github.com/apache/beam/pull/14927#discussion_r653794490
##########
File path:
sdks/java/io/mongodb/src/main/java/org/apache/beam/sdk/io/mongodb/MongoDbIO.java
##########
@@ -106,6 +109,28 @@
* .withNumSplits(30))
*
* }</pre>
+ *
+ * *
+ *
+ * <p>To configure a MongoDB sink and update, you must specify a connection
{@code URI}, a {@code
+ * Database} * name, a {@code Collection} name. It matches the key with _id in
target collection.
+ * For instance: * *
+ *
+ * <pre>{@code
+ * * pipeline
+ * * .apply(...)
+ * * .apply(MongoDbIO.write()
+ * * .withUri("mongodb://localhost:27017")
+ * * .withDatabase("my-database")
+ * * .withCollection("my-collection")
+ * * .withIsUpdate(true)
+ * * .withUpdateKey("key-to-match")
+ * * .withUpdateField("field-to-update")
+ * * .withUpdateOperator("$set")
+ * * .withNumSplits(30))
Review comment:
my guess is that maybe we have an document like this in the database:
```
{
"name": "ironman",
"status": "active",
"age": 55,
"location": "malibu",
"lastUpdated": "(SOME TIMESTAMP)"
}
```
And perhaps the PCollection that comes as input contains the following
element:
```
{
"name": "ironman",
"status": "inactive",
"age": 56,
"location": "malibu"
}
```
In this case, we could do:
```
.withUpdateKey("name")
.withUpdateFields(
UpdateField.of("$set", "status"),
UpdateField.of("$currentDate", "lastUpdated"),
UpdateField.of("$set", "age")))
```
Does that make sense? Another thing I wonder about is - what if we just want
to update all the fields without having to list them all one by one on the
`updateFields` attribute of the transform.
thoughts?
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