C#•3y ago

❔ Entity Framework

im trying to make spotify like application but anytime i try to get the user who created the playlist it turns up null.

public List<PlaylistDTO> GetAllPlaylists()
        { 
            using (var db = new SurroundDbContext())
            {
                return db.Playlists.Include(p => p.Creator).ToList();
            }
        }


public class PlaylistDTO
    {
        [Key]
        public int Id { get; set; }
        public string Name { get; set; } = null!;
        public ICollection<SongDTO> Songs { get; set; } = null!;
        [ForeignKey("UserId")]
        public int CreatorId { get; set; }
        public UserDTO Creator { get; set; } = null!;
    }

public class UserDTO
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int UserID { get; set; }
        public string? Username { get; set; }
        public string? Email { get; set; }
        public string? Password { get; set; }
        public string? VerPass;
        public DateTime CreatedDate { get; set; }
        public ICollection<PlaylistDTO> PlayLists { get; set; } = null!;
    }

public List<PlaylistDTO> GetAllPlaylists()
        { 
            using (var db = new SurroundDbContext())
            {
                return db.Playlists.Include(p => p.Creator).ToList();
            }
        }


public class PlaylistDTO
    {
        [Key]
        public int Id { get; set; }
        public string Name { get; set; } = null!;
        public ICollection<SongDTO> Songs { get; set; } = null!;
        [ForeignKey("UserId")]
        public int CreatorId { get; set; }
        public UserDTO Creator { get; set; } = null!;
    }

public class UserDTO
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int UserID { get; set; }
        public string? Username { get; set; }
        public string? Email { get; set; }
        public string? Password { get; set; }
        public string? VerPass;
        public DateTime CreatedDate { get; set; }
        public ICollection<PlaylistDTO> PlayLists { get; set; } = null!;
    }

13 Replies

phaseshift•3y ago

$code

MODiX•3y ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat If your code is too long, post it to: https://paste.mod.gg/

phaseshift•3y ago

Please format code properly

poopkakaOP•3y ago

how can i format it?

phaseshift•3y ago

Read the message above Include should work. Presume you don't have data in the db or something like that

poopkakaOP•3y ago

{
        "id": 1,
        "name": "test123",
        "songs": null,
        "creator": {
            "userID": 0,
            "username": null,
            "email": null,
            "createdDate": "0001-01-01T00:00:00",
            "playLists": null
        }
    },
    {
        "id": 10,
        "name": "test123766",
        "songs": null,
        "creator": {
            "userID": 0,
            "username": null,
            "email": null,
            "createdDate": "0001-01-01T00:00:00",
            "playLists": null
        }
    },
    {
        "id": 11,
        "name": "test1qqq",
        "songs": null,
        "creator": {
            "userID": 0,
            "username": null,
            "email": null,
            "createdDate": "0001-01-01T00:00:00",
            "playLists": null
        }
    }

{
        "id": 1,
        "name": "test123",
        "songs": null,
        "creator": {
            "userID": 0,
            "username": null,
            "email": null,
            "createdDate": "0001-01-01T00:00:00",
            "playLists": null
        }
    },
    {
        "id": 10,
        "name": "test123766",
        "songs": null,
        "creator": {
            "userID": 0,
            "username": null,
            "email": null,
            "createdDate": "0001-01-01T00:00:00",
            "playLists": null
        }
    },
    {
        "id": 11,
        "name": "test1qqq",
        "songs": null,
        "creator": {
            "userID": 0,
            "username": null,
            "email": null,
            "createdDate": "0001-01-01T00:00:00",
            "playLists": null
        }
    }

i get this back creator should be filled with a user

phaseshift•3y ago

All the ids are 0, so looks like you didn't add the user data correctly There's also no creatorId in your returned json ...

FusedQyou•3y ago

Why do you assign null! to everything? Anyway you probably forgot to specify how to map your creator? That or the id is not saved at all. Did you check your database?

phaseshift•3y ago

It's one way to avoid Compiler warnings

FusedQyou•3y ago

This is a null forgiving operator on null. How this is valid? Is the whole point to throw an error when the value is not set?

phaseshift•3y ago

The point is just to shut the compiler up. The value will be set by EF, so we don't care about it not being set in the constructor

poopkakaOP•3y ago

exactly that

Accord•3y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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