public async Task <IActionResult> Create([Bind("Id,Title,ReleaseDate,Genre,Price")] Movie movie)
{
if (ModelState.IsValid)
{
_context.Add(movie);
await _context.SaveChangesAsync();
return(RedirectToAction(nameof(Index)));
}
return(View(movie));
}
static void AddAMovie()
{
using (var db = new MoviesDBContext(options))
{
// get first alphabetical name
// (no network access yet!)
var firstMovieQuery = db.Movie.Include(m => m.Genre).OrderBy(m => m.Name);
Movie movie = firstMovieQuery.First();
// that fetched only the one movie, not all of them
var newMovie = new Movie {
Name = movie.Name + " 2", Genre = movie.Genre
};
// few different ways to add this. (aka track the entity)
db.Add(newMovie); // this one guesses which DbSet based on the type.
//db.Movie.Add(newMovie);
// we can add this movie to the genre's navigation property "Movie" collection.
//movie.Genre.Movie.Add(newMovie);
// after doing any of those, the change to the database is recorded in the DbContext
// but not yet applied to the DB.
// SaveChanges applies all the tracked changes in one transaction
db.SaveChanges();
// now, those extra properties on the newMovie that we didn't set (like Id)
// have been filled in by the dbcontext.
// (you can continue working and savechanges multiple times on one dbcontext)
}
// objects you get out of the DbSets are "tracked" by the context.
// any changes you make to them will be noticed and applied to the DB
// on the next SaveChanges.
// objects you create yourself are NOT tracked - track them with db.Add,
// db.Update, or adding them to a tracked entity's navigation property.
}
