A relationship is in the Deleted state

Question

When I am trying to clear a collection (calling .Clear) I get the following exception:

An error occurred while saving entities that do no

Answer 1

In case someone has the same problem using SQLite:

Unfortunately the accepted answer does not work with SQLite because SQLite does not support auto increment for composite keys.

You can also override the SaveChanges() Method in the Database context to delete the children:

//// Long Version
//var localChilds = this.SubCategories.Local.ToList();
//var deletedChilds = localChilds.Where(w => w.Category == null).ToList();
//foreach(var child in deletedChilds) {
//   this.SubCategories.Remove(child);
//}

// Short in LINQ
this.SubCategories.Local
    .Where(w => w.Category == null).ToList()
    .ForEach(fe => this.SubCategories.Remove(fe));
#endregion

See this great Blogpost as my source (Unfortunately written in german).