Fix bulk download path generation

Author: naglepuff

nmdc_server/crud.py

@@ -439,7 +439,7 @@ def construct_zip_file_path(data_object: models.DataObject) -> str:
     #   - We probably want to reference the workflow activity but that
     #     involves a complicated query... need a way to join that information
     #     in the original query (possibly in the sqlalchemy relationship)
-    omics_processing = data_object.omics_processing
+    omics_processing = data_object.omics_processings[0]
     biosamples = cast(Optional[list[models.Biosample]], omics_processing.biosample_inputs)
 
     def safe_name(name: str) -> str:

nmdc_server/models.py

@@ -824,6 +824,16 @@ class DataObject(Base):
     omics_processing_id = Column(String, ForeignKey("omics_processing.id"), nullable=True)
     omics_processing = relationship(OmicsProcessing)
 
+    # Note that we're telling mypy to ignore this weird typing.
+    # We are declaring this as a list of OmicsProcessing (which it is),
+    # but mypy expects a RelationshipValue. This might be avoidable in
+    # SQLAlchemy 2.0 using Mapped[...]
+    omics_processings: List[OmicsProcessing] = relationship(
+        OmicsProcessing,
+        secondary=omics_processing_output_association,
+        back_populates="outputs",
+    )  # type: ignore
+
     # Define a property that can be used to shortcut calculating counts.
     # Useful when downstream code can more efficiently determine download
     # counts for a batch of DataObjects and inject those counts.