diff --git a/pyproject.toml b/pyproject.toml
index f92a7af..2e3eec3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,9 @@ test = ["pytest==8.4.1"]
 minversion = "6.0"
 testpaths = ["tests"]
 python_files = ["tests.py"]
+pythonpath = [
+  "."
+]
 
 [tool.uv.build-backend]
 module-name = "sqlonfhir"
diff --git a/sqlonfhir/sqlonfhir.py b/sqlonfhir/sqlonfhir.py
index d2e53c2..e4377c5 100644
--- a/sqlonfhir/sqlonfhir.py
+++ b/sqlonfhir/sqlonfhir.py
@@ -5,10 +5,6 @@
 from fhirpathpy.models import models
 
 
-def upper_first(string):
-    return string[:1].upper() + string[1:]
-
-
 # This is here to change identified.ofType(boolean) to identifiedBoolean.ofType(boolean)
 # This function should be replaced at some point as fhirpathpy and the SQL on FHIR specifications converge
 def escape_path(path):
@@ -204,9 +200,7 @@ def move_functions(view, function, sub_functions):
 
 
 def replace_constants(path, view_definition):
-    if "constant" not in view_definition:
-        return path
-    for constant in view_definition["constant"]:
+    for constant in view_definition.get("constant") or []:
         value_key = [vk for vk in constant.keys() if vk.startswith("value")]
         if "valueBoolean" in constant:
             path = path.replace(