Unwrap TermSetWrapper in ObjectMapper and no the IO

src/hdmf/backends/hdf5/h5tools.py

@@ -1103,10 +1103,6 @@ def write_dataset(self, **kwargs):  # noqa: C901
             data = data.data
         else:
             options['io_settings'] = {}
-        if isinstance(data, TermSetWrapper):
-            # This is for when the wrapped item is a dataset
-            # (refer to objectmapper.py for wrapped attributes)
-            data = data.value
         attributes = builder.attributes
         options['dtype'] = builder.dtype
         dset = None

src/hdmf/build/builders.py

@@ -145,6 +145,7 @@ def __init__(self, **kwargs):
         name, groups, datasets, links, attributes, parent, source = getargs(
             'name', 'groups', 'datasets', 'links', 'attributes', 'parent', 'source', kwargs)
         # NOTE: if groups, datasets, or links are dicts, their keys are unused
+        # breakpoint()
         groups = self.__to_list(groups)
         datasets = self.__to_list(datasets)
         links = self.__to_list(links)

src/hdmf/build/manager.py

@@ -768,7 +768,6 @@ def build(self, **kwargs):
         if manager is None:
             manager = BuildManager(self)
         builder = obj_mapper.build(container, manager, builder=builder, source=source, spec_ext=spec_ext, export=export)
-
         # add additional attributes (namespace, data_type, object_id) to builder
         namespace, data_type = self.get_container_ns_dt(container)
         builder.set_attribute('namespace', namespace)

src/hdmf/build/objectmapper.py

@@ -757,6 +757,10 @@ def build(self, **kwargs):
                             msg = 'could not resolve dtype for %s \'%s\'' % (type(container).__name__, container.name)
                             raise Exception(msg) from ex
                         builder = DatasetBuilder(name, bldr_data, parent=parent, source=source, dtype=dtype)
+        if isinstance(builder, DatasetBuilder) and isinstance(builder.data, TermSetWrapper):
+            builder.data = builder.data.value
+        else:
+            pass
 
         # Add attributes from the specification extension to the list of attributes
         all_attrs = self.__spec.attributes + getattr(spec_ext, 'attributes', tuple())