Replace with map!

Author: grzegorz-jakubiak

lib/active_admin/mongoid/filter_form_builder.rb

@@ -25,7 +25,7 @@ def default_input_type(method, options = {})
   end
 
   def is_association?(method)
-    @object.klass.associations.to_a.map(&:first).include?(method.to_s)
+    @object.klass.associations.to_a.map!(&:first).include?(method.to_s)
   end
 
   def column_for(method)