added test for lzin passthrough in workflows

pydra/compose/tests/test_workflow_run.py

@@ -6,6 +6,7 @@
 import typing as ty
 import attr
 from pathlib import Path
+from fileformats.generic import File
 from pydra.engine.tests.utils import (
     Add2,
     Add2Wait,
@@ -4606,3 +4607,18 @@ def Worky(x: int, y: ty.List[int]):
     outputs = Worky(x=10, y=[1, 2, 3, 4])(cache_root=tmp_path)
     assert outputs.sum == 100
     assert outputs.products == [10, 20, 30, 40]
+
+
+def test_wf_lzin_passthrough(tmp_path: Path) -> None:
+    @workflow.define
+    def IdentityWorkflow(x: int) -> int:
+        return x
+
+    @workflow.define
+    def OuterWorkflow(x: int) -> int:
+        ident = workflow.add(IdentityWorkflow(x=x))
+        add2 = workflow.add(Add2(x=ident.out))
+        return add2.out
+
+    wf = OuterWorkflow(x=1)
+    assert wf(cache_root=tmp_path).out == 3

pydra/compose/workflow.py

@@ -12,7 +12,7 @@
     extract_fields_from_class,
 )
 from pydra.utils.general import attrs_values
-from pydra.utils.typing import StateArray
+from pydra.utils.typing import StateArray, is_lazy
 
 if ty.TYPE_CHECKING:
     from pydra.engine.workflow import Workflow
@@ -334,7 +334,10 @@ def _from_job(cls, job: "Job[WorkflowTask]") -> ty.Self:
         values = {}
         lazy_field: LazyOutField
         for name, lazy_field in attrs_values(workflow.outputs).items():
-            val_out = lazy_field._get_value(workflow=workflow, graph=exec_graph)
+            if is_lazy(lazy_field):
+                val_out = lazy_field._get_value(workflow=workflow, graph=exec_graph)
+            else:
+                val_out = lazy_field  # handle non-lazy inputs that are passed through
             if isinstance(val_out, StateArray):
                 val_out = list(val_out)  # implicitly combine state arrays
             values[name] = val_out

pydra/engine/workflow.py

@@ -187,7 +187,8 @@ def construct(
                 )
             for outpt, outpt_lf in zip(output_fields, output_lazy_fields):
                 # Automatically combine any uncombined state arrays into a single lists
-                outpt_lf._type = State.combine_state_arrays(outpt_lf._type)
+                if isinstance(outpt_lf, LazyOutField):
+                    outpt_lf._type = State.combine_state_arrays(outpt_lf._type)
                 setattr(outputs, outpt.name, outpt_lf)
         else:
             if unset_outputs := [