I have an EF query in which I am returning an 'Item' by it's unique identifier. I'm using the scaffolded controller provided by MVC and this works ok, but now I want it to return a list of tags which belong to the item.
I thought I might be able to use 'Include' as shown below to eager fetch the tags. However this does not seem to be allowed when using async.
Item item = await db.Items.Include("Tags").FindAsync(id);
Can anybody explain why this won't work and suggest an alternative way to bring back the item's tags?
FindAsync() are methods on type
DbSet (which is what
Include() returns a
DbQuery object, which is why
FindAsync() is not available. Use
SingleOrDefaultAsync() to do the same thing as
FindAsync() (the difference is it will go straight to the database and won't look in the context to see if the entity exists first)...
Item item = await db.Items.Include("Tags").SingleOrDefaultAsync(i => i.Id == id);
Followed by @Anthony and @Korayem answer, I recommend to do as below for safer code.
Item item = await db.Items.Include(o => o.Tags).FirstOrDefaultAsync(i => i.Id == id); if(item == default(Item)) return NotFound();