Ensure record ID changes are detected in diff

util/diff/diff.go

@@ -277,7 +277,7 @@ func (o *operations) vals(old, now interface{}, path string) {
 		}
 	case *sql.Thing:
 		nv := now.(*sql.Thing)
-		if ov.TB != nv.TB && ov.ID != nv.ID {
+		if ov.TB != nv.TB || ov.ID != nv.ID {
 			o.op("replace", "", path, old, now)
 		}
 	case bool:

util/diff/diff_test.go

@@ -17,11 +17,14 @@ package diff
 import (
 	"testing"
 
+	"github.com/abcum/surreal/sql"
+
 	. "github.com/smartystreets/goconvey/convey"
 )
 
 var old = map[string]interface{}{
-	"age": 18,
+	"age":  18,
+	"item": sql.NewThing("test", 1),
 	"name": map[string]interface{}{
 		"first": "T",
 		"last":  "M H",
@@ -32,7 +35,8 @@ var old = map[string]interface{}{
 }
 
 var now = map[string]interface{}{
-	"age": 29,
+	"age":  29,
+	"item": sql.NewThing("test", 2),
 	"name": map[string]interface{}{
 		"first": "Tobie",
 		"last":  "Morgan Hitchcock",
@@ -97,6 +101,11 @@ var chg = []interface{}{
 		"path":  "/different",
 		"value": true,
 	},
+	map[string]interface{}{
+		"op":    "replace",
+		"path":  "/item",
+		"value": sql.NewThing("test", 2),
+	},
 	map[string]interface{}{
 		"op":    "change",
 		"path":  "/name/first",