How can I make a static partition depend on a specific upstream asset?

To define dependencies between a static partition and a specific upstream asset, you can use a

PartitionMapping

to explicitly map the relationship between the partitions of the upstream and downstream assets. The documentation provides several types of

PartitionMapping

that you can use depending on your specific use case: 1. StaticPartitionMapping: This allows you to define an explicit correspondence between two

StaticPartitionsDefinitions

. You can specify a single or multi-valued correspondence from upstream keys to downstream keys. 2. SpecificPartitionsPartitionMapping: This mapping is used to map to a specific subset of partitions in the upstream asset. Here's an example from the documentation using `SpecificPartitionsPartitionMapping`:

python from dagster import SpecificPartitionsPartitionMapping, StaticPartitionsDefinition, asset  @asset(partitions_def=StaticPartitionsDefinition(["a", "b", "c"])) def upstream():     ...  @asset(     ins={         "upstream": AssetIn(partition_mapping=SpecificPartitionsPartitionMapping(["a"]))     } ) def a_downstream(upstream):     ...

In this example, the downstream asset

a_downstream

depends on the "a" partition of the upstream asset

upstream

. Remember to choose the appropriate

PartitionMapping

based on whether you want a one-to-one mapping, a one-to-many mapping, or a mapping to a specific subset of partitions. The

PartitionMapping

you choose will define how the downstream asset's partitions relate to the upstream asset's partitions.

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