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POCannot attach an entity that already exists
 

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    <p>I get this error whenever i try to update one of my models. The update is pretty simple:</p> <pre><code>Todo bn = service.GetTodos().Single(t =&gt; t.todoId == 1); bn.Note.noteTitle = "Something new"; service.SaveTodo(bn); </code></pre> <p>And the models have this kind of structure:</p> <ul> <li>A Todo has a Note</li> <li>A Todo has a list of Tasks</li> </ul> <p>I have my service's SaveTodo look a little something like this:</p> <pre><code>public void SaveTodo ( TodoWrapper note ) { using (Repository repo = new Repository(new HpstrDataContext())) { if (note != null) { Todo todo = repo.Todos.SingleOrDefault(t =&gt; t.todoId == note.todoId); if (todo == null) { todo = new Todo(); todo.Note = new Note(); } todo.dueDate = note.dueDate; todo.priority = (short)note.priority; todo.Note.isTrashed = note.Note.isTrashed; todo.Note.permission = (short)note.Note.permission; todo.Note.noteTitle = note.Note.noteTitle; repo.SaveTodo(todo); } } } </code></pre> <p>And the Repository's SaveTodo method is pretty simple and looks like this:</p> <pre><code>public void SaveTodo ( Todo todo ) { if (todo.Note.noteId == 0) { dc.NoteTable.InsertOnSubmit(todo.Note); } else { dc.NoteTable.Attach(todo.Note); dc.NoteTable.Context.Refresh(RefreshMode.KeepCurrentValues , todo.Note); } if (todo.todoId == 0) { dc.TodoTable.InsertOnSubmit(todo); } else { dc.TodoTable.Attach(todo); dc.TodoTable.Context.Refresh(RefreshMode.KeepCurrentValues , todo); } dc.SubmitChanges(); } </code></pre> <p>The error is being thrown at this line in the Repository: <code>dc.NoteTable.Attach(todo.Note);</code>. I've tried a lot of different things to get this to work but nothing seems to work. </p> <p>Any help would be greatly appreciated</p>
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    1. USCollin O'Connor
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