CLI model generation issues with Index attribute

[mangelito]

This what is generated by create-models:

    [Type(DatabaseType.MySQL, "mediumint", false)]
    [Column("RakenskapsarFK")]
    public virtual int RakenskapsarFK { get; set; }

    [Index("RakenskapsarFK_Kontonummer", IndexCharacteristic.Unique, IndexType.BTREE)]
    [Type(DatabaseType.MySQL, "smallint", false)]
    [Column("Kontonummer")]
    public virtual int Kontonummer { get; set; }

The actual database index is on both RakenskapsarFK and Kontonummer, but the Index attribute only appears on the Kontonummer column.

You can try to manually "correct" it, though I'm not sure this is correct:

    [Index("RakenskapsarFK_Kontonummer", IndexCharacteristic.Unique, IndexType.BTREE, nameof(RakenskapsarFK), nameof(Kontonummer))]
    [Type(DatabaseType.MySQL, "mediumint", false)]
    [Column("RakenskapsarFK")]
    public virtual int RakenskapsarFK { get; set; }

    [Index("RakenskapsarFK_Kontonummer", IndexCharacteristic.Unique, IndexType.BTREE, nameof(RakenskapsarFK), nameof(Kontonummer))]
    [Type(DatabaseType.MySQL, "smallint", false)]
    [Column("Kontonummer")]
    public virtual int Kontonummer { get; set; }

But if you do this model generation fails with the following call stack:

Unhandled exception. System.InvalidOperationException: Sequence contains no matching element
   at System.Linq.ThrowHelper.ThrowNoMatchException()
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
   at DataLinq.Metadata.MetadataFactory.<>c__DisplayClass0_0.<ParseIndices>b__4(String colName) in D:\git\DataLinq\src\DataLinq\Metadata\MetadataFactory.cs:line 44
   at System.Linq.Enumerable.SelectArrayIterator`2.Fill(ReadOnlySpan`1 source, Span`1 destination, Func`2 func)
   at System.Linq.Enumerable.SelectArrayIterator`2.ToList()
   at DataLinq.Metadata.MetadataFactory.ParseIndices(DatabaseMetadata database) in D:\git\DataLinq\src\DataLinq\Metadata\MetadataFactory.cs:line 43
   at DataLinq.Metadata.MetadataFromFileFactory.ReadFiles(String csType, IEnumerable`1 srcPaths) in D:\git\DataLinq\src\DataLinq.Tools\MetadataFromFileFactory.cs:line 130
   at DataLinq.Tools.ModelGenerator.CreateModels(DataLinqDatabaseConnection connection, String basePath, String databaseName) in D:\git\DataLinq\src\DataLinq.Tools\ModelGenerator.cs:line 136
   at DataLinq.CLI.Program.<>c.<Main>b__12_2(CreateModelsOptions options) in D:\git\DataLinq\src\DataLinq.CLI\Program.cs:line 155
   at CommandLine.ParserResultExtensions.WithParsed[T](ParserResult`1 result, Action`1 action)
   at DataLinq.CLI.Program.Main(String[] args) in D:\git\DataLinq\src\DataLinq.CLI\Program.cs:line 88