Awesome
nullable
This is a POC implementation of a Nullable
type that allows knowing whether a field was nullable and/or optional in Go, meant for JSON serialization and deserialization.
It relies on Go generics, but rather than using a custom struct, it relies on a map as its underlying type. The problem with using a struct is that:
- on deserialization from JSON, any `null`` value in the JSON input combined with a struct pointer leads Go to skip the UnmarhalJSON for that value
- on serializaton to JSON, we do want the benefits of a
nil
pointer to be combined withomitempty
in order for a non-specified field to not appear in the resulting JSON
Using a map as underlying type allows using nil
while still making use of a non-explicit-pointer to a struct.
This is inspired from this post by KumanekoSakura.
See some examples of usage in nullable_test.go
.