Sqlite.net extentions, Cant get data with GetWithChildren - sqlite

Question

I'm creating a database with serveral classes as children of other classes. Writing with foreign keys works fine however when i try to get the data back it throws the error:
An unhandled exception of type 'SQLiteNetExtensions.Exceptions.IncorrectRelationshipException' occurred in SQLiteNetExtensions.dll
Additional information: MatchDetail.timeline: At least one entity in a OneToOne relationship must have Foreign Key
This is my creation code:
SQLiteConnection db = new SQLiteConnection(new SQLite.Net.Platform.Win32.SQLitePlatformWin32(), "Matches.db3");
db.CreateTable<ParticipantIdentity>();
db.CreateTable<MatchDetail>();
db.CreateTable<Timeline>();
db.InsertWithChildren(md, true);
var m = db.GetWithChildren<MatchDetail>(matchId, true);
And my class:
[Table("Matches")]
public class MatchDetail
{
[PrimaryKey]
public long matchId { get; set; }
public int mapId { get; set; }
[JsonConverter(typeof(DateTimeConverterFromLong))]
public DateTime MatchCreation { get; set; }
public long matchDuration { get; set; }
public MatchMode matchMode { get; set; }
public MatchType matchType { get; set; }
public string matchVersion { get; set; }
public string platformId { get; set; }
public Queuetype queueType { get; set; }
public Region region { get; set; }
public Season season { get; set; }
[ForeignKey(typeof(Timeline), Name = "TimelineId"), Indexed]
public int timelineId { get; set; }
[OneToOne("TimelineId", CascadeOperations = CascadeOperation.All)]
public Timeline timeline { get; set; }
[ForeignKey(typeof(ParticipantIdentity), Name = "ParticipantId"), Indexed]
public int participantIdentitiesId { get; set; }
[ManyToOne("ParticipantId", CascadeOperations = CascadeOperation.All)]
public List<ParticipantIdentity> participantIdentities { get; set; }
}
The other classes are just an id and some other basic types, I've been trying to work this out but it just doesnt want to work.
Edit:
[ForeignKey(typeof(ParticipantIdentity))]
public int participantIdentitiesId { get; set; }
[OneToMany(CascadeOperations = CascadeOperation.All)]
public List<ParticipantIdentity> participantIdentities { get; set; }
With error:
An unhandled exception of type 'SQLiteNetExtensions.Exceptions.IncorrectRelationshipException' occurred in SQLiteNetExtensions.dll
Additional information: MatchDetail.participantIdentities: Unable to find foreign key for OneToMany relationship

Answer 1

You are manually specifying that the foreign key is named 'TimelineId' but in reality the foreign key is named 'timelineId' (note capitalization of the first letter).
Change this:
[ForeignKey(typeof(Timeline), Name = "TimelineId"), Indexed]
public int timelineId { get; set; }
[OneToOne("TimelineId", CascadeOperations = CascadeOperation.All)]
public Timeline timeline { get; set; }
To this:
[ForeignKey(typeof(Timeline)]
public int timelineId { get; set; }
[OneToOne(CascadeOperations = CascadeOperation.All)]
public Timeline timeline { get; set; }
Explicitly declaring the foreign key name can lead to refactoring issues, so this is the recommended way unless otherwise is strictly required.
The other relationship is declared as a ManyToOne but it's in fact a OneToMany. To make it work you have to change the attribute type and move the foreign key to the other end.
Change the relationship from:
[ForeignKey(typeof(ParticipantIdentity), Name = "ParticipantId"), Indexed]
public int participantIdentitiesId { get; set; }
[ManyToOne("ParticipantId", CascadeOperations = CascadeOperation.All)]
public List<ParticipantIdentity> participantIdentities { get; set; }
With this:
[OneToMany(CascadeOperations = CascadeOperation.All)]
public List<ParticipantIdentity> participantIdentities { get; set; }
And add the foreign key to MatchDetail to the ParticipantIdentity class:
[ForeignKey(typeof(MatchDetail)]
public int matchDetailId { get; set; }
Take a look at the SQLite-Net Extensions documentation and sample project for more examples.