1 files changed, 9 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
index 6657491c06..b8e7687b21 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid.rb
@@ -145,6 +145,14 @@ module ActiveRecord
           end
         end
 
+        class Json < Type
+          def type_cast(value)
+            return if value.nil?
+
+            ConnectionAdapters::PostgreSQLColumn.string_to_json value
+          end
+        end
+
         class TypeMap
           def initialize
             @mapping = {}
@@ -244,6 +252,7 @@ module ActiveRecord
         register_type 'polygon', OID::Identity.new
         register_type 'circle', OID::Identity.new
         register_type 'hstore', OID::Hstore.new
+        register_type 'json', OID::Json.new
 
         register_type 'cidr', OID::Cidr.new
         alias_type 'inet', 'cidr'