selection: implement for nil as well

meh · Jul 4, 2014 · 367e6c5 · 367e6c5
1 parent e94993a
commit 367e6c5
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/lib/amnesia/selection.ex b/lib/amnesia/selection.ex
@@ -3,3 +3,17 @@ defprotocol Amnesia.Selection do
   def next(self)
   def values(self)
 end
+
+defimpl Amnesia.Selection, for: Atom do
+  def coerce(nil, _) do
+    nil
+  end
+
+  def next(nil) do
+    nil
+  end
+
+  def values(nil) do
+    []
+  end
+end