Revert "Remove Marshal support from SchemaCache"

This reverts commit 65f2eeaaf5774f0891fff700f4defb0b90a05789.

1 files changed, 11 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/schema_cache.rb b/activerecord/lib/active_record/connection_adapters/schema_cache.rb
index 5b598620d3..07453b4403 100644
--- a/activerecord/lib/active_record/connection_adapters/schema_cache.rb
+++ b/activerecord/lib/active_record/connection_adapters/schema_cache.rb
@@ -114,6 +114,17 @@ module ActiveRecord
         @indexes.delete name
       end
 
+      def marshal_dump
+        # if we get current version during initialization, it happens stack over flow.
+        @version = connection.migration_context.current_version
+        [@version, @columns, @columns_hash, @primary_keys, @data_sources, @indexes]
+      end
+
+      def marshal_load(array)
+        @version, @columns, @columns_hash, @primary_keys, @data_sources, @indexes = array
+        @indexes = @indexes || {}
+      end
+
       private
         def prepare_data_sources
           connection.data_sources.each { |source| @data_sources[source] = true }