流畅的映射SQLite中的奇怪外键约束

Question

I have a model written using FluentNhibernate and I am trying to create some test data in an in-memory SQLite database.

var fConfig =
                Fluently.Configure()
                        .Database(config)
                        .Mappings(m => m.FluentMappings.AddFromAssembly(Assembly.GetAssembly(exampleClass))
                        .Conventions.Add(AutoImport.Never())
                        .Conventions.Add(new SQLiteGeometryTypeConvention())
                         .Conventions.Add(FluentNHibernate.Conventions.Helpers.DefaultLazy.Never()))
                        .ExposeConfiguration(cfg => configuration = cfg);

The problem I am getting is that one of the tables is created like this in the generated sql something like this :

 create table myTable (
       myID  integer primary key autoincrement,
       ...{skip normal columns} 
       ForeignTable1ID INT,
       ParentID BIGINT,
       constraint FK1A2E045AFEC6908F foreign key (ForeignTable1ID) references ForeignTable1,
       constraint FK1A2E045ABB4EBD1F foreign key (ParentID) references Parent,
       constraint FKE21911CF6853D06E foreign key (myID) references Parent
)

I don't want that third constraint but don't know what's causing it! The effect being that I can only create records in myTable which have valid foreign keys BUT ALSO have a myID value which exists in the Parent table. This is unnecessary, and I can't see what's causing it.

The mapping file looks like this:

Table("dbo.PalslagInventering");
            Id(x => x.myId).Column("myID");
            References(x => x.ForeignTable1).Column("ForeignTable1ID");
            References(x => x.Parent).Column("ParentID");

            Map(x => x.{other columns here});

HasMany(x => x.Child).KeyColumn("myID");
            HasOne(x => x.Child2).ForeignKey("MyID");

            HasMany(x => x.Child2).KeyColumn("MyID").ForeignKeyConstraintName("Child2");
            HasMany(x => x.Child3).KeyColumn("MyID").ForeignKeyConstraintName("Child3");

The parent table (being referenced) has a simple

public virtual IList<MyTable> myTableRecords { get; private set; }

Type of code mapped as:

HasMany(x => x.myTableRecords)
                .KeyColumn("myID")
                .Inverse();

What is causing the "foreign key" reference back to it's own myId?

Answer 1

The error seems to be:

HasMany(x => x.myTableRecords)
                .KeyColumn("myID")
                .Inverse();

Where it's the Child table (ie "MyTable") which has the ID "myID" and the KeyColumn should point to the Parent table (ie the foreign key in "MyTable").

So:

HasMany(x => x.myTableRecords)
                .KeyColumn("ParentID")
                .Inverse();

Seems to have fixed the problem. That the error was in the parent class's mapping file meant I missed it at first.