Support dynamic partitioning in AssetSlice

python_modules/dagster/dagster/_core/asset_graph_view/asset_graph_view.py

@@ -21,6 +21,7 @@
 from dagster._core.definitions.partition import (
     AllPartitionsSubset,
     DefaultPartitionsSubset,
+    DynamicPartitionsDefinition,
     StaticPartitionsDefinition,
 )
 from dagster._core.definitions.time_window_partitions import (
@@ -207,8 +208,8 @@ def time_windows(self) -> Sequence[TimeWindow]:
                 check.failed(
                     f"Unsupported subset value in generated subset {self._compatible_subset.subset_value} created by keys {tw_partition_keys}"
                 )
-        else:
-            check.failed(f"Unsupported subset value: {self._compatible_subset.subset_value}")
+
+        check.failed(f"Unsupported subset value: {self._compatible_subset.subset_value}")
 
     def _time_window_partitions_def_in_context(self) -> Optional[TimeWindowPartitionsDefinition]:
         pd = self._partitions_def
@@ -403,10 +404,9 @@ def create_latest_time_window_slice(self, asset_key: AssetKey) -> AssetSlice:
         TODO: add language for dynamic partitioning when we support it
         """
         partitions_def = self._get_partitions_def(asset_key)
-        if partitions_def is None:
-            return self.get_asset_slice(asset_key)
-
-        if isinstance(partitions_def, StaticPartitionsDefinition):
+        if partitions_def is None or isinstance(
+            partitions_def, (DynamicPartitionsDefinition, StaticPartitionsDefinition)
+        ):
             return self.get_asset_slice(asset_key)
 
         if isinstance(partitions_def, TimeWindowPartitionsDefinition):
@@ -482,7 +482,8 @@ def _build_multi_partition_slice(
                     last_tw
                 )
                 for secondary_pk in multi_dim_info.secondary_partition_def.get_partition_keys(
-                    dynamic_partitions_store=self._queryer, current_time=self.effective_dt
+                    current_time=self.effective_dt,
+                    dynamic_partitions_store=self._queryer,
                 )
             }
         )

python_modules/dagster/dagster/_core/definitions/partition.py

@@ -525,7 +525,9 @@ def get_partition_keys(
                 check.failed(
                     "The instance is not available to load partitions. You may be seeing this error"
                     " when using dynamic partitions with a version of dagster-webserver or"
-                    " dagster-cloud that is older than 1.1.18."
+                    " dagster-cloud that is older than 1.1.18. The other possibility is that an"
+                    " internal framework error where a dynamic partitions store was not properly"
+                    " threaded down a call stack."
                 )
 
             return dynamic_partitions_store.get_dynamic_partitions(
@@ -545,7 +547,9 @@ def has_partition_key(
                 check.failed(
                     "The instance is not available to load partitions. You may be seeing this error"
                     " when using dynamic partitions with a version of dagster-webserver or"
-                    " dagster-cloud that is older than 1.1.18."
+                    " dagster-cloud that is older than 1.1.18. The other possibility is that an"
+                    " internal framework error where a dynamic partitions store was not properly"
+                    " threaded down a call stack."
                 )
 
             return dynamic_partitions_store.has_dynamic_partition(

python_modules/dagster/dagster_tests/asset_defs_tests/asset_graph_view_tests/test_latest_time_window.py

@@ -11,7 +11,10 @@
     MultiPartitionKey,
     MultiPartitionsDefinition,
 )
-from dagster._core.definitions.partition import StaticPartitionsDefinition
+from dagster._core.definitions.partition import (
+    DynamicPartitionsDefinition,
+    StaticPartitionsDefinition,
+)
 from dagster._core.definitions.time_window_partitions import DailyPartitionsDefinition, TimeWindow
 from dagster._core.execution.context.compute import AssetExecutionContext
 from dagster._core.instance import DagsterInstance
@@ -255,3 +258,61 @@ def multi_dimensional(context: AssetExecutionContext) -> None: ...
     assert asset_graph_view.create_latest_time_window_slice(
         multi_dimensional.key
     ).compute_partition_keys() == set(partition_keys)
+
+
+def test_dynamic_partitioning_latest_time_window() -> None:
+    dynamic_partition_def = DynamicPartitionsDefinition(name="letters")
+    instance = DagsterInstance.ephemeral()
+    partition_keys = {"A", "B", "C"}
+    instance.add_dynamic_partitions("letters", list(partition_keys))
+
+    @asset(partitions_def=dynamic_partition_def)
+    def dynamic_asset() -> None: ...
+
+    daily_partitions_def = DailyPartitionsDefinition(
+        start_date=pendulum.datetime(2020, 1, 1), end_date=pendulum.datetime(2020, 1, 3)
+    )
+    multi_partitions_definition = MultiPartitionsDefinition(
+        {"daily": daily_partitions_def, "dynamic": dynamic_partition_def}
+    )
+
+    @asset(partitions_def=multi_partitions_definition)
+    def dynamic_multi_dimensional() -> None: ...
+
+    defs = Definitions([dynamic_asset, dynamic_multi_dimensional])
+
+    asset_graph_view = AssetGraphView.for_test(defs, instance)
+    assert (
+        asset_graph_view.get_asset_slice(dynamic_asset.key).compute_partition_keys()
+        == partition_keys
+    )
+    assert (
+        asset_graph_view.create_latest_time_window_slice(dynamic_asset.key).compute_partition_keys()
+        == partition_keys
+    )
+
+    partition_keys = []
+    jan_2_keys = []
+    for daily_pk in daily_partitions_def.get_partition_keys(dynamic_partitions_store=instance):
+        for dynamic_pk in dynamic_partition_def.get_partition_keys(
+            dynamic_partitions_store=instance
+        ):
+            if daily_pk == "2020-01-02":
+                jan_2_keys.append(MultiPartitionKey({"daily": daily_pk, "dynamic": dynamic_pk}))
+
+            partition_keys.append(MultiPartitionKey({"daily": daily_pk, "dynamic": dynamic_pk}))
+
+    assert asset_graph_view.get_asset_slice(
+        dynamic_multi_dimensional.key
+    ).compute_partition_keys() == set(partition_keys)
+    assert asset_graph_view.create_latest_time_window_slice(
+        dynamic_multi_dimensional.key
+    ).compute_partition_keys() == set(jan_2_keys)
+
+    assert _tw(
+        asset_graph_view.create_latest_time_window_slice(dynamic_multi_dimensional.key)
+    ).start == pendulum.datetime(2020, 1, 2)
+
+    assert _tw(
+        asset_graph_view.create_latest_time_window_slice(dynamic_multi_dimensional.key)
+    ).end == pendulum.datetime(2020, 1, 3)