public void Save()
{
RemoveEmptyNewNinjas();
_context.SaveChanges();
}
/// <summary>
/// This is for disconnected apps like websites,api service.
/// Take deep look at disconnected model this is just the surface
/// Take EF enterpise course for patterns to solve data persistance
/// </summary>
private static void UpdateNinjaDisconnectedModel()
{
//----note:
//object to be changed
Ninja ninja;
//-----note:
//imaginge the server is retriving a client object and sending
//it back to the client
using (var context = new NinjaContext())
{
context.Database.Log = Console.WriteLine;
ninja = context.Ninjas.FirstOrDefault();
}
//-------note:
//change: imagine the client updates said object and sends it back
ninja.ServedInObiOne = (!ninja.ServedInObiOne);
//---------note:
//updating = false : EF has no way of nowing the state of the object
//All this does is reinsatiate the context and call save()
//the resut is only the query gets executed but save changes doesnt:
//has no clue of the history of ninja,
using (var context = new NinjaContext())
{
//DBcontext Log:
context.Database.Log = Console.WriteLine;
//--------note:
//lets make aware of ninja for argument sake:
//lets add said ninja object: EF will add without being aware of the
//state of ninja.EF is not a human and will do what you tell it:
//----------------code:-----------commeted out for reason above !!!!!!!!
//context.Ninjas.Add(ninja);
//-------note:
//if we use the attach method (we say hey watch this data
//But it still has no way of knowing the state of ninja object
//and how it used to have a different value:
//this would be usefull to use if the value being changed was underneath
//the attach statment:
context.Ninjas.Attach(ninja);
//-------note:Entery state
//So we have to make EF context aware of the state of the object state
//This is a great way to force entity framework to update all of the object
//only downside is it goes through all the coloums:
context.Entry(ninja).State = EntityState.Modified;
context.SaveChanges();
//reasources:--read more
//--https://stackoverflow.com/questions/30987806/dbset-attachentity-vs-dbcontext-entryentity-state-entitystate-modified
}
}