Assure changes to process ids are updated in the cache on a file save,

and remove old references that no longer exist.  Still some work to do here.

spiffworkflow-backend/src/spiffworkflow_backend/services/spec_file_service.py

@@ -160,6 +160,8 @@ class SpecFileService(FileSystemService):
             (ref for ref in references if ref.is_primary and ref.is_executable), None
         )
 
+        SpecFileService.clear_caches_for_file(file_name, process_model_info)
+
         for ref in references:
             # If no valid primary process is defined, default to the first process in the
             # updated file.
@@ -235,6 +237,14 @@ class SpecFileService(FileSystemService):
         SpecFileService.update_message_trigger_cache(ref)
         SpecFileService.update_correlation_cache(ref)
 
+    @staticmethod
+    def clear_caches_for_file(file_name: str, process_model_info: ProcessModelInfo) -> None:
+        """Clear all caches related to a file"""
+        db.session.query(SpecReferenceCache).\
+            filter(SpecReferenceCache.file_name == file_name).\
+            filter(SpecReferenceCache.process_model_id == process_model_info.id).delete()
+        # fixme:  likely the other caches should be cleared as well, but we don't have a clean way to do so yet.
+
     @staticmethod
     def clear_caches() -> None:
         """Clear_caches."""
@@ -254,6 +264,7 @@ class SpecFileService(FileSystemService):
         if process_id_lookup is None:
             process_id_lookup = SpecReferenceCache.from_spec_reference(ref)
             db.session.add(process_id_lookup)
+            db.session.commit()
         else:
             if ref.relative_path != process_id_lookup.relative_path:
                 full_bpmn_file_path = SpecFileService.full_path_from_relative_path(

spiffworkflow-backend/tests/spiffworkflow_backend/unit/test_spec_file_service.py

@@ -119,6 +119,45 @@ class TestSpecFileService(BaseTest):
             == self.call_activity_nested_relative_file_path
         )
 
+    def test_change_the_identifier_cleans_up_cache (
+        self,
+        app: Flask,
+        client: FlaskClient,
+        with_db_and_bpmn_file_cleanup: None,
+        with_super_admin_user: UserModel,
+    ) -> None:
+        """ When a BPMN processes identifier is changed in a file, the old id
+        is removed from the cache"""
+        old_identifier = "ye_old_identifier"
+        process_id_lookup = SpecReferenceCache(
+            identifier=old_identifier,
+            relative_path=self.call_activity_nested_relative_file_path,
+            file_name=self.bpmn_file_name,
+            process_model_id=f"{self.process_group_id}/{self.process_model_id}",
+            type='process'
+        )
+        db.session.add(process_id_lookup)
+        db.session.commit()
+
+        self.create_group_and_model_with_bpmn(
+            client=client,
+            user=with_super_admin_user,
+            process_group_id=self.process_group_id,
+            process_model_id=self.process_model_id,
+            bpmn_file_name=self.bpmn_file_name,
+            bpmn_file_location=self.process_model_id,
+        )
+
+        bpmn_process_id_lookups = SpecReferenceCache.query.all()
+        assert len(bpmn_process_id_lookups) == 1
+        assert bpmn_process_id_lookups[0].identifier != old_identifier
+        assert bpmn_process_id_lookups[0].identifier == "Level1"
+        assert (
+            bpmn_process_id_lookups[0].relative_path
+            == self.call_activity_nested_relative_file_path
+        )
+
+
     def test_load_reference_information(
         self,
         app: Flask,