Add a deprecation cycle for `NullColumn` from `column_for_attribute`

This is public API, and `simple_form` depends on the `nil` return value.
We need to go through a deprecation cycle to return a null object. If
people want hash access, they can access the hash.

1 files changed, 0 insertions, 6 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index 8be4678ace..1f1e2c46f4 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -57,12 +57,6 @@ module ActiveRecord
         end
       end
     end
-
-    class NullColumn < Column
-      def initialize(name)
-        super name, nil, Type::Value.new
-      end
-    end
   end
   # :startdoc:
 end