JSONB is not nullable

[benjaminjb]

Description

Feature request: a nullable JSONB field.

slices.Map does not handle a nullable JSONB field. gobuffalo/nulls has replacements for the built-in null types in the sql package, but since jsonb is not a sql native type, there is no null handling in that package.

(I have a fix that I am experimenting with locally, so will create a PR and link to that in a moment.)

Steps to Reproduce the Problem

1. Add a fizz migration with a nullable jsonb field: add_column("table", "column", "jsonb", {"null": true})
2. Attempt to retrieve an object from that table. (In my case, I'm using Insomnia to call to the api.)

Expected Behavior

The JSONB field to be marshalled as a null object.

Actual Behavior

Error from API:

"error": "scan source was not []byte nor string but <nil>"

Info

Pop (through Buffalo): github.com/gobuffalo/pop/v5@v5.3.3
Go: go1.16.2 darwin/amd64
MacOS: 10.14.6 (18G6032)