Question

Why when ever i call

db.SaveChanges();

i git this error

The relationship between the two objects cannot be defined because they are attached to different ObjectContext objects

after debugging i noticed that the issue occurs when i call getX() function inside my model :

public ICollection<Dish> getX()
        {
            if (this.x== null)
            {
                return x= this.initX().ToList<X>();
            }
            return x;
        } 

while the initX is a simple linq query

why i cant set the value of x? so when i change the line to

return this.initX().ToList<X>(); // whithout x=...

it works fine …

Answer 1

Make sure that you are using the same instance of the ObjectContext for all the querys on this transaction.