Question

I have a simple relationship:

I have a “Note” object, which has a related “Company” object.
When creating a “Note”, you select an existing “Company”, and enter the other neccessary fields.

My issue is that whenever I save, it inserts a new version of the “Company” object, and I can’t figure out why.

I have tried all the options in the accepted answer here Insert new object with existing object but nothing works.

Currently, I am doing the following:

var company = db.Company.FirstOrDefault(i => i.ID == note.Company.ID);
note.Company = company;

db.Notes.AddObject(note);
db.ObjectStateManager.ChangeObjectState(company, EntityState.Unchanged);
db.ObjectStateManager.ChangeObjectState(note, EntityState.Added);

db.SaveChanges();

But, it keeps adding a new “Company” object. What is strange, is that it doesn’t add all the fields, just the CompanyName” field, (and creates a new Id).

Answer 1

If this is an existing company, set the CompantID field and not the entity

note.CompanyID = company.ID;