Cannot resolve output-type System.DateTime

[OneCyrus]

Describe the bug
there looks to be a regression with 0.7.0 (alpha.34) after upgrading from 0.6.11.

To Reproduce
we get the following error

HotChocolate.SchemaException: 'testGraphQuery.date: Cannot resolve output-type `System.DateTime` - Type: TestGraphQuery'

with registering this simple type (c.RegisterQueryType<TestGraphQuery>())

public class TestGraphQuery
    {
        public string Version { get; set; } = "0.0.1-alpha.1";
        public DateTime Date { get; set; } = DateTime.Now;
    }

Expected behavior
with 0.6.11 we get a Date GraphType

Desktop (please complete the following information):

• OS: Windows 10
• Version 0.7.0 (alpha 34)

[scottrabara]

Hi Daniel,

There were some changes done for #433 made to address custom extended scalars. Since then, the stock built-in extended scalars must now be explicitly registered during schema configuration if you do not intend to override them:

var schema = Schema.Create(c =>
{
    // Register all 6 pre-built extended scalar types
    c.RegisterExtendedScalarTypes();
});

or

var schema = Schema.Create(c =>
{
    // Register only pre-built date time type
    c.RegisterType<DateTimeType>();
});

[scottrabara]

Perhaps I can add a migration section in the Scalar Type Support documentation to make light of this situation @michaelstaib

[OneCyrus]

oh good to know. thanks!

[michaelstaib]

Hey @scottrabara, that is a good point ...

but let's create a separate section and put all migration steps there since we have another breaking change with the DataLoader.

[michaelstaib]

@OneCyrus thanks for reporting this one

[michaelstaib]

This one is now done .... https://hotchocolate.io/docs/next/migration