Entity Framework 6 entity mapping

Giordano bruno 0
Viewed 40

I am trying to write a simple CRUD on C#.

I am having troubles defining the relationships between these entities:

public class Movie
{
    [Key]
    public int Id { get; set; } 
    public string Title { get; set; }  
    public Director Director { get; set; }
}

public class Director
{
    [Key]
    public int Id { get; set; }     
    public string Name { get; set; }
    public ICollection<Movie> DirectedMovies { get; set; }
}

How do I make it so that one director can have multiple movies and one movie can have one director?

The Movie table has the DirectorId column but I cannot find a way to add a director to the movie from the frontend side.

In MovieController, I have this code:

public ActionResult performAddMovie(Movie movie) 
{
    try
    {
        ctx.Movies.Add(movie);
        ctx.SaveChanges();
        return RedirectToAction("Index", "Home");
    }
    catch(Exception ex) 
    {
        ModelState.AddModelError("Messaggio", ex.Message);
    }

    return RedirectToAction("Index", "Home");
}

This lets me add a new movie to the database, but I don't know how to add a director too.

Thank you

entity-framework c#
3 Answers

The Director is just another property. Presumably, before you pass a particular Movie object to performAddMovie, you're setting the title of the Movie.

If you've got the ID of Director, you can do:

var director = ctx.Directors.FirstOrDefault(d => d.Id == directorId);
movie.Director = director;

return performAddMovie(movie);
Quasipickle0

you have add DirectorId property in Movie class

KHYT0

Check this following code

Check this following code 

public class Movie
{
    public int Id { get; set; } 
    public string Title { get; set; }
    public int DirectorId { get; set; }
    
    [ForeignKey("DirectorId")] 
    public Director Director { get; set; }
 }

public class Director
{
    public int DirectorId { get; set; }     
    public string Name { get; set; }
    public ICollection<Movie> DirectedMovies { get; set; }
}
Mehdi Kacim0
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