What is the best way to have a partitioned graph backed asset depend on the latest materialization of some other (non-partitioned) asset?

I have defined something like this:

@asset(
    key_prefix=KEY_PREFIX,
    ins={
        'types_mapping': AssetIn(
            key=[KEY_PREFIX, 'types_mapping'],
            partition_mapping=LastPartitionMapping()
        )
    }
)

Even if the upstream asset has no partitions?

yes, if the input is not partitioned there shouldn't be a problem

That looks like it should work, but when I try and materialize a downstream partition, I get an error saying it cannot be materialized because upstream partitions are missing

is upstream partition materialized too?

Yes

could you show the error or definition of your assets?

its basically like:

@asset
def asset1():
 ...

@op
def op1(asset1):
 ....

@graph_asset(
  partitions_def=HourlyPartition(...),
  ins = {
     'asset1': AssetIn('asset1', partition_mapping = LastPartitionMapping())
  }
)
def g1(asset1):
  op1(asset1)

Sorry for the retype, I can't copy and paste from the environment

in that case you don't need partition_mapping as your upstream is not partitioned.

and passing it plain just works... :headbang: I just made it way too complicated