1 files changed, 8 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
index 9ec0a67c8f..7e3760d34b 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
@@ -93,7 +93,7 @@ module ActiveRecord
       # Override to return the quoted table name for assignment. Defaults to
       # table quoting.
       #
-      # This works for mysql and mysql2 where table.column can be used to
+      # This works for mysql2 where table.column can be used to
       # resolve ambiguity.
       #
       # We override this in the sqlite3 and postgresql adapters to use only
@@ -102,9 +102,13 @@ module ActiveRecord
         quote_table_name("#{table}.#{attr}")
       end
 
-      def quote_default_expression(value, column) #:nodoc:
-        value = lookup_cast_type(column.sql_type).serialize(value)
-        quote(value)
+      def quote_default_expression(value, column) # :nodoc:
+        if value.is_a?(Proc)
+          value.call
+        else
+          value = lookup_cast_type(column.sql_type).serialize(value)
+          quote(value)
+        end
       end
 
       def quoted_true