remove Rev field in record

Author: Hongchao Deng

db/backend.go

@@ -78,7 +78,6 @@ func (b *backend) Put(rev int, path Path, data []byte) {
 
 	b.rev++
 	offset, err := b.log.Append(&message.Record{
-		Rev:  b.rev,
 		Key:  path.p,
 		Data: data,
 	})

db/log/encoder_test.go

@@ -13,7 +13,6 @@ func TestEncoderDecoder(t *testing.T) {
 		rec *message.Record
 	}{
 		{&message.Record{
-			Rev:  1,
 			Key:  "/test",
 			Data: []byte("some data"),
 		}},

db/log/log_test.go

@@ -21,12 +21,10 @@ func TestAppendAndGetRecord(t *testing.T) {
 		rec    *message.Record
 	}{
 		{-1, &message.Record{
-			Rev:  1,
 			Key:  "/test",
 			Data: []byte("some data"),
 		}},
 		{-1, &message.Record{
-			Rev:  2,
 			Key:  "/test2",
 			Data: []byte("some other data"),
 		}},

db/message/record.go

@@ -3,7 +3,6 @@ package message
 import "encoding/json"
 
 type Record struct {
-	Rev  int
 	Key  string
 	Data []byte
 }

db/message/record_test.go

@@ -10,7 +10,6 @@ func TestLogRecord(t *testing.T) {
 		rec *Record
 	}{
 		{&Record{
-			Rev:  1,
 			Key:  "/test",
 			Data: []byte("some data"),
 		}},