graphdiff

I have following entities in my DbContext : public class A { public A() { Bs = new List<B>(); } public ICollection<B> Bs { set; get; } } Sometimes I Want to update a graph: var a = dbContext.As .AsNoTracking() .Include(x=>x.Bs) .firstOrDefault(); var c = new C(); a.Bs.Add(c); var d = new D(); var e1 = new E(); var e2 = new E(); d.Es.Add(e1); //<-- added new E d.Es.Add(e2); //<-- added new E a.Bs.Add(d); I want to update a with its Bs (update C , D , E too) using graphdiff : dbContext.UpdateGraph(a,map=>map.OwnedCollection(x=>x.Bs)); This updates A , B s, C s, D s, but not E s. So I think, I

This is my model: - Business - BusinesType - FK - Categories (*) - FK - Branch (*) - BranchType - FK - Address - Phone (*) - CustomFields (*) - OpeningTimes (*) - WorkingPeriods (*) - ..... Now I have a controller-action that accepts a form that consists of the whole bunch of data as a single Business entity with all its properties and collections set fine. Now I have to walk thru all the properties and collections recursively, and compare with the database graph; if they don't exist, add them, if they do walk thru all properties again and perform the same to a deeper level until no navigation

I get following error during update with EF: The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable. When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another non-null value, or the unrelated object must be deleted. Is there any general way to find which foreign-key properties cause above error? [Update] For one case following code cause above error(I