.

wcfs/δbtail.go

@@ -690,8 +690,8 @@ func (δBtail *ΔBtail) rebuild() (err error) {
 			if !ok {
 				// this root was not tracked before -> create δTtail for it with empty changes
 				var vδT []ΔTree
-				for i := 0; i < len(vδZ); i++ {
-					vδT = append(vδT, ΔTree{Rev: vδZ[i].Rev, ΔKV: make(map[Key]ΔValue)})
+				for j := 0; j < len(vδZ); j++ {
+					vδT = append(vδT, ΔTree{Rev: vδZ[j].Rev, ΔKV: make(map[Key]ΔValue)})
 				}
 				δTtail = &ΔTtail{
 					vδT: vδT,
@@ -785,12 +785,24 @@ func (δBtail *ΔBtail) Update(δZ *zodb.EventCommit) (_ ΔB, err error) {
 
 		if len(δT) > 0 { // an object might be resaved without change
 			δB.ByRoot[root] = δT
+			δTtail, ok := δBtail.byRoot[root]
+			if !ok {
+				// this root was not tracked before ... XXX
+				δTtail = &ΔTtail {
+					// XXX vδT: ...
+					// XXX KVAtTail: ...,
+					// XXX lastRevOf: ...,
+				}
+				δBtail.byRoot[root] = δTtail
+			}
+
+			δTtail.vδT = append(δTtail.vδT, ΔTree{Rev: δZ.Tid, ΔKV: δT})
+
+			// XXX rebuild KVAtTail
+			// XXX rebuild lastRevOf
 		}
 	}
 
-	// XXX .δBtail <- (δZ.rev, [](root, []key))
-	// XXX rebuild lastRevOf
-
 	return δB, nil
 }