diff --git a/src/portal_visualization/assays.py b/src/portal_visualization/assays.py
index 1726ab3..ad6ec9f 100644
--- a/src/portal_visualization/assays.py
+++ b/src/portal_visualization/assays.py
@@ -11,3 +11,4 @@
 SCATAC_SEQ_SCI = "sc_atac_seq_sci"
 SCATAC_SEQ_SNARE = "sc_atac_seq_snare"
 SCATAC_SEQ_SN = "sn_atac_seq"
+SALMON_RNASSEQ_SLIDE = "salmon_rnaseq_slideseq"
\ No newline at end of file
diff --git a/src/portal_visualization/builder_factory.py b/src/portal_visualization/builder_factory.py
index f45e9f3..82d562a 100644
--- a/src/portal_visualization/builder_factory.py
+++ b/src/portal_visualization/builder_factory.py
@@ -18,18 +18,33 @@
 from .assays import (
     SEQFISH,
     MALDI_IMS,
-    NANODESI
+    NANODESI,
+    SALMON_RNASSEQ_SLIDE
 )
 
+# get_assaytype response example:
+# {
+#   "assaytype": "image_pyramid",
+#   "description": "Image Pyramid",
+#   "vitessce_hints": [
+#     "is_image",
+#     "pyramid"
+#   ]
+# }
 
-def get_view_config_builder(entity, get_assay):
-    data_types = entity["data_types"]
-    assay_objs = [get_assay(dt) for dt in data_types]
-    assay_names = [assay.name for assay in assay_objs]
-    hints = [hint for assay in assay_objs for hint in assay.vitessce_hints]
+
+def get_ancestor_assaytypes(entity, get_assaytype):
+    return [get_assaytype(ancestor.get('uuid')).get('assaytype') for ancestor in entity['immediate_ancestors']]
+
+
+def get_view_config_builder(entity, get_assaytype):
+    assay = get_assaytype(entity.get('uuid'))
+    assay_name = assay.get('assaytype')
+    hints = assay.get('vitessce_hints', [])
     dag_provenance_list = entity.get('metadata', {}).get('dag_provenance_list', [])
     dag_names = [dag['name']
                  for dag in dag_provenance_list if 'name' in dag]
+    print(entity.get('uuid'), assay_name)
     if "is_image" in hints:
         if 'sprm' in hints and 'anndata' in hints:
             return MultiImageSPRMAnndataViewConfBuilder
@@ -40,17 +55,17 @@ def get_view_config_builder(entity, get_assay):
         # Both SeqFISH and IMS were submitted very early on, before the
         # special image pyramid datasets existed.  Their assay names should be in
         # the `entity["data_types"]` while newer ones, like NanoDESI, are in the parents
-        if SEQFISH in assay_names:
+        if assay_name == SEQFISH:
             return SeqFISHViewConfBuilder
-        if MALDI_IMS in assay_names:
+        if assay_name == MALDI_IMS:
             return IMSViewConfBuilder
-        if NANODESI in [dt for e in entity["immediate_ancestors"] for dt in e["data_types"]]:
+        if NANODESI in [assaytype for assaytype in get_ancestor_assaytypes(entity, get_assaytype)]:
             return NanoDESIViewConfBuilder
         return ImagePyramidViewConfBuilder
     if "rna" in hints:
         # This is the zarr-backed anndata pipeline.
         if "anndata-to-ui.cwl" in dag_names:
-            if "salmon_rnaseq_slideseq" in data_types:
+            if assay_name == SALMON_RNASSEQ_SLIDE:
                 return SpatialRNASeqAnnDataZarrViewConfBuilder
             return RNASeqAnnDataZarrViewConfBuilder
         return RNASeqViewConfBuilder
@@ -59,6 +74,6 @@ def get_view_config_builder(entity, get_assay):
     return NullViewConfBuilder
 
 
-def has_visualization(entity, get_assay):
-    builder = get_view_config_builder(entity, get_assay)
+def has_visualization(entity, get_assaytype):
+    builder = get_view_config_builder(entity, get_assaytype)
     return builder != NullViewConfBuilder