Can you launch a RunRequest while creating partition keys for a DynamicPartition

[dagsir[bot]]

Hi!
Is it possible to launch a RunRequest in single-run mode when dynamically creating some partition keys for a DynamicPartition?

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The question was originally asked in Dagster Slack.

[clairelin135]

Yes, it is possible. Here's an example:

stations_partition = DynamicPartitionsDefinition(name="stations")

@asset(partitions_def=stations_partition)
def my_asset():
    ...

@sensor(asset_selection=AssetSelection.keys(my_asset.key))
def stations_sensor(context):
    stations = ["1", "2", "3"]
    return SensorResult(
        run_requests=[RunRequest(run_key=None, tags={ASSET_PARTITION_RANGE_START_TAG: "1", ASSET_PARTITION_RANGE_END_TAG: "3"})],
        dynamic_partitions_requests=[stations_partition.build_add_request(stations)],
    )