.

wcfs/δbtail.go

@@ -746,13 +746,15 @@ func (δBtail *ΔBtail) Update(δZ *zodb.EventCommit) (_ ΔB, err error) {
 	// update .trackIdx and vδB from .trackNew
 	δBtail.rebuild()
 
-	tracef("Update δZ: %v\n", δZ.Changev)
+	tracef("Update @%s -> @%s\n", δBtail.Head(), δZ.Tid)
+	tracef("δZ:\t%v\n", δZ.Changev)
 	tracef("trackIdx:       %v\n", δBtail.trackIdx)
 	tracef("holeIdxByRoot:  %v\n", δBtail.holeIdxByRoot)
 
-
 	// XXX dup wrt rebuild?
 
+	δBtail.δZtail.Append(δZ.Tid, δZ.Changev)
+
 	δZTC, δtopsByRoot := δZConnectTracked(δZ.Changev, δBtail.trackIdx)
 
 	δB := ΔB{Rev: δZ.Tid, ByRoot: make(map[zodb.Oid]map[Key]ΔValue)}
@@ -789,7 +791,8 @@ func (δBtail *ΔBtail) Update(δZ *zodb.EventCommit) (_ ΔB, err error) {
 				// this root was not tracked before -> create δTtail for it with empty changes
 				// XXX do not keep entries with empty δkv ?
 				var vδT []ΔTree
-				for _, δZj := range δBtail.δZtail.Data() {
+				vδZ := δBtail.δZtail.Data()
+				for _, δZj := range vδZ[:len(vδZ)-1] {
 					vδT = append(vδT, ΔTree{Rev: δZj.Rev, ΔKV: make(map[Key]ΔValue)})
 				}
 				δTtail = &ΔTtail {
@@ -807,7 +810,6 @@ func (δBtail *ΔBtail) Update(δZ *zodb.EventCommit) (_ ΔB, err error) {
 		}
 	}
 
-	δBtail.δZtail.Append(δZ.Tid, δZ.Changev)
 	return δB, nil
 }