common time tracking fields

Signed-off-by: David Lawrence <david.lawrence@docker.com> (github: endophage)

storage/rethinkdb/rethinkdb.go

@@ -1,12 +1,22 @@
 package rethinkdb
 
 import (
+	"time"
+
 	"github.com/dancannon/gorethink"
 	"github.com/docker/go-connections/tlsconfig"
 )
 
 var session *gorethink.Session
 
+// Timing can be embedded into other gorethink models to
+// add time tracking fields
+type Timing struct {
+	CreatedAt *time.Time `gorethink:"created_at"`
+	UpdatedAt *time.Time `gorethink:"updated_at"`
+	DeletedAt *time.Time `gorethink:"deleted_at"`
+}
+
 // Connection sets up a RethinkDB connection to the host (`host:port` format)
 // using the CA .pem file provided at path `caFile` and the authKey
 func Connection(caFile, host, authKey string) (*gorethink.Session, error) {