How to get a DynamoFormat[T] from a external case class? about scanamo HOT 8 CLOSED

I pushed a small repro here.

I must be tired. 💩

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Turns out I just need some implicit formats for certain properties of my case classes.

ie. EntityId, ConferenceId, OffsetDateTime, etc...

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Just one more hurdle....how can I create a DynamoFormat for an ADT.

see this

Not sure it's the best way, but it's an ADT and not changing. So it works for me.

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To be clear for anyone reading this in the future....

Make sure all properties in a case class have a DynamoFormat in scope. If not, you won't get any helpful errors. It will just say that there's not a format for your class.

See this link for examples.

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Sorry, only just noticed this. It looks pretty good to me.

The pattern with the sealed trait seems reasonably common and is something I'd like to provide a way of deriving, to avoid all that boilerplate.

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Oh. I forgot about this. I actually wrote a macro for this. I will post it later

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Here's the macro I ended up with. Hope it helps.

https://gist.github.com/trbngr/75195f0f8fd8f5b33491b1dc22707249

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I had been building my own local scanamo 6.1-SNAPSHOT locally with #55 applied. I had been using a simple case class with a derived format created by scanamo-scrooge, like case class AFormatWrapper(rowkey: Array[Byte],det: AFormat) . Now updating to scanamo 7 and getting:

could not find implicit value for evidence parameter of type com.gu.scanamo.DynamoFormat[com.example.AFormatWrapper]

I think I'm facing the same issue. @philwills this seems to be a related issue. Any suggestions?

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