Hotchocolate: Nullable fields are not sortable

[hognevevle]

Per https://hotchocolategraphql.slack.com/archives/CD9TNKT8T/p1581887583149800

In version 10.3.5 with .UseSorting(), nullable fields such as DateTime? are not sortable by default.

Attempts to sort by such fields will throw the error "The specified input object field xxx does not exist."

Was able to work around it by creating a custom SortInputType, and explicitly marking the nullable field as sortable (descriptor.Sortable(i => i.MyNullableField);).

[michaelstaib]

Hi @hognevevle there is a fix already merged into 10.4.0. So, if you grab one of the 10.4.0 previews it should already work.

[michaelstaib]

https://github.com/ChilliCream/hotchocolate/commit/012c4719bfb67889eb75c7037bb00ab4b0c598e4

https://github.com/ChilliCream/hotchocolate/pull/1419

[michaelstaib]

I am closing this issue since @PascalSenn already fixed it :)