solved issues when moving tasks

core/src/main/java/de/srsoftware/umbrella/core/model/Task.java

@@ -70,6 +70,10 @@ public class Task implements Mappable {
 		return estimatedTime;
 	}
 
+	public boolean hasMember(UmbrellaUser user) {
+		return members.containsKey(user.id());
+	}
+
 	public long id(){
 		return id;
 	}
@@ -215,8 +219,9 @@ public class Task implements Mappable {
 		return map;
 	}
 
-	public boolean hasMember(UmbrellaUser user) {
-		return members.containsKey(user.id());
-	}
 
+	@Override
+	public String toString() {
+		return name;
+	}
 }

frontend/src/routes/task/ListTask.svelte

@@ -12,6 +12,7 @@
     let {
         estimated_time,
         show_closed,
+        siblings,
         task
     } = $props();
     let children = $state(null);
@@ -39,34 +40,25 @@
         }
     }
 
-    function drag(ev,task){
+    function ondragstart(ev){
         ev.stopPropagation();
-        task.new_parent = false;
+        dragged.element  = task;
-        dragged.element = task;
+        dragged.siblings = siblings;
     }
 
-    function dragend(ev,task){
-        ev.stopPropagation();
-        setTimeout(() => {
-        if (dragged.moved){
-            console.log("removing",ev.target);
-            ev.target.remove();
-        }
-        },500);
-    }
 
-    async function dropAt(ev,target){
+    async function ondrop(ev){
         ev.stopPropagation();
-        if (dragged.element.id == target.id) return;
+        if (dragged.element.id == task.id) return;
         const  url = api(`task/${dragged.element.id}`);
         const resp = await fetch(url,{
             credentials : 'include',
             method      : 'PATCH',
-            body        : JSON.stringify({ parent_task_id : target.id})
+            body        : JSON.stringify({ parent_task_id : task.id})
         });
         if (resp.ok) {
-            dragged.moved = true;
             children[dragged.element.id]=dragged.element;
+            if (dragged.siblings[dragged.element.id]) delete dragged.siblings[dragged.element.id];
         } else {
             error = await resp.text();
         }
@@ -125,7 +117,7 @@
 </script>
 
 {#if !deleted}
-<li draggable="true" ondrop={ev => dropAt(ev, task)} ondragover={e => e.preventDefault()} ondragend={e => dragend(e,task)} ondragstart={e => drag(e,task)} class="task {task.status.name.toLowerCase()}">
+<li draggable="true" {ondrop} ondragover={e => e.preventDefault()} {ondragstart} class="task {task.status.name.toLowerCase()}">
     <LineEditor bind:value={task.name} onclick={openTask} editable={true} onSet={setName} type="a" />
     {#if task.estimated_time}
     <span class="estimated_time">({+task.estimated_time}&nbsp;h)</span>

frontend/src/routes/task/TaskList.svelte

@@ -10,6 +10,6 @@
 
 <ul>
     {#each sortedTasks as task}
-    <ListTask {task} {estimated_time} show_closed={show_closed || task.show_closed} />
+    <ListTask {task} siblings={tasks} {estimated_time} show_closed={show_closed || task.show_closed} />
     {/each}
 </ul>

task/src/main/java/de/srsoftware/umbrella/task/TaskModule.java

@@ -277,12 +277,22 @@ public class TaskModule extends BaseHandler implements TaskService {
 		if (json.has(DROP_MEMBER) && json.get(DROP_MEMBER) instanceof Number id) dropMember(task,id.longValue());
 		if (json.has(MEMBERS) && json.get(MEMBERS) instanceof JSONObject memberJson) patchMembers(task,memberJson);
 		if (json.has(NEW_MEMBER) && json.get(NEW_MEMBER) instanceof Number num) addMember(task,num.longValue());
-
+		if (json.has(PARENT_TASK_ID) && json.get(PARENT_TASK_ID) instanceof Number ptid && newParentIsSubtask(task,ptid.longValue())) throw forbidden("Task must not be sub-task of itself.");
 		taskDb.save(task.patch(json));
 
 		return sendContent(ex,task);
 	}
 
+	private boolean newParentIsSubtask(Task task, long newParent) {
+		var parent = taskDb.load(newParent);
+		while (parent != null){
+			if (task.id() == parent.id()) return true;
+			if (parent.parentTaskId() == null) break;
+			parent = taskDb.load(parent.parentTaskId());
+		}
+		return false;
+	}
+
 	private boolean postNewTask(UmbrellaUser user, HttpExchange ex) throws IOException {
 		var json = json(ex);
 		if (!(json.has(PROJECT_ID) && json.get(PROJECT_ID) instanceof Number pid)) throw missingFieldException(PROJECT_ID);