Allow mapping aesthetic to None

closes #791
has2k1 · Sep 19, 2024 · 737611e · 737611e
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diff --git a/doc/changelog.qmd b/doc/changelog.qmd
@@ -39,6 +39,8 @@ title: Changelog
   by giving them no shape, now they do not affect the limits of the plot.
   ({{< issue 814 >}})
 
+- Made it possile to map an aesthetic value to `None`. ({{< issue 791 >}})
+
 ### New Features
 
 - [](:class:`~plotnine.geom_text`) has gained new aesthetics

diff --git a/plotnine/mapping/evaluation.py b/plotnine/mapping/evaluation.py
@@ -242,7 +242,7 @@ def evaluate(
                 )
                 raise PlotnineError(msg)
             evaled[ae] = col
-        elif is_known_scalar(col):
+        elif is_known_scalar(col) or col is None:
             if not len(evaled):
                 col = [col]
             evaled[ae] = col