ENH: Raise error in case of multiprops

src/caosadvancedtools/json_schema_exporter.py

@@ -94,7 +94,7 @@ def _make_prop_from_prop(prop, additional_options_for_text_props):
         json_prop["type"] = "integer"
     elif prop.datatype == db.DOUBLE:
         json_prop["type"] = "number"
-    elif prop.datatype.startswith("LIST"):
+    elif isinstance(prop.datatype, str) and prop.datatype.startswith("LIST"):
         json_prop["type"] = "array"
         list_element_prop = db.Property(
             name=prop.name, datatype=_extract_elemet_dtyp_from_list_dtype(prop.datatype))
@@ -170,6 +170,12 @@ def recordtype_to_json_schema(rt: db.RecordType, additional_properties: bool = T
         props["description"] = _make_text_property("The description of the Record to be created")
 
     for prop in rt.properties:
+        if prop.name in props:
+            # Multi property
+            raise NotImplementedError(
+                "Creating a schema for multi-properties is not specified. "
+                f"Property {prop.name} occurs more than once."
+            )
         props[prop.name] = _make_prop_from_prop(prop, additional_options_for_text_props)
 
     schema["properties"] = props

unittests/test_json_schema_exporter.py

@@ -232,3 +232,24 @@ def test_rt_with_references():
     with raises(NotImplementedError):
 
         rtjs(rt)
+
+
+def test_broken():
+
+    rt = db.RecordType()
+    rt.add_property(name="something", datatype=None)
+
+    with raises(ValueError) as ve:
+
+        rtjs(rt)
+        assert str(ve).startswith("Unknown or no property datatype.")
+
+    rt = db.RecordType()
+    rt.add_property(name="MultiProp", datatype=db.INTEGER)
+    rt.add_property(name="MultiProp", datatype=db.INTEGER)
+
+    with raises(NotImplementedError) as nie:
+
+        rtjs(rt)
+        assert "MultiProp" in str(nie)
+        assert str(nie).startswith("Creating a schema for multi-properties is not specified.")