#6, update trigger expressions when renaming datapoints

main.go

@@ -711,8 +711,15 @@ func actionDatapointUpdate(w http.ResponseWriter, r *http.Request, _ *session.T)
 	var nodataSeconds int
 	nodataSeconds, _ = strconv.Atoi(r.FormValue("nodata_seconds"))
 
+	// Datapoint needs to be retrieved from database for the name.
+	// If name has changed, trigger expressions needs to be updated.
 	var dp Datapoint
-	dp.ID = id
+	dp, err = DatapointRetrieve(id, "")
+	if err != nil {
+		httpError(w, werr.Wrap(err).WithData(id).Log())
+		return
+	}
+	prevDatapointName := dp.Name
 	dp.Group = r.FormValue("group")
 	dp.Name = r.FormValue("name")
 	dp.Datatype = DatapointType(r.FormValue("datatype"))
@@ -724,6 +731,29 @@ func actionDatapointUpdate(w http.ResponseWriter, r *http.Request, _ *session.T)
 		return
 	}
 
+	// Update the trigger expressions using this
+	// datapoint name if changed.
+	if prevDatapointName != dp.Name {
+		var triggers []Trigger
+		triggers, err = TriggersRetrieveByDatapoint(dp.Name)
+		if err != nil {
+			httpError(w, werr.Wrap(err).WithData(dp.Name))
+			return
+		}
+		for _, trigger := range triggers {
+			err = trigger.RenameDatapoint(prevDatapointName, dp.Name)
+			if err != nil {
+				httpError(w, werr.Wrap(err).WithData([]string{prevDatapointName, dp.Name}))
+				return
+			}
+			err = trigger.Update()
+			if err != nil {
+				httpError(w, werr.Wrap(err).WithData([]string{prevDatapointName, dp.Name, trigger.Name}))
+				return
+			}
+		}
+	}
+
 	w.Header().Add("Location", "/datapoints")
 	w.WriteHeader(302)
 } // }}}