1 files changed, 5 insertions, 2 deletions
diff --git a/activemodel/lib/active_model/attribute_assignment.rb b/activemodel/lib/active_model/attribute_assignment.rb
index 930e89d611..aa931119ff 100644
--- a/activemodel/lib/active_model/attribute_assignment.rb
+++ b/activemodel/lib/active_model/attribute_assignment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_support/core_ext/hash/keys"
 
 module ActiveModel
@@ -42,8 +44,9 @@ module ActiveModel
       end
 
       def _assign_attribute(k, v)
-        if respond_to?("#{k}=")
-          public_send("#{k}=", v)
+        setter = :"#{k}="
+        if respond_to?(setter)
+          public_send(setter, v)
         else
           raise UnknownAttributeError.new(self, k)
         end