422 on challenge updates

[scarroll32]

Updating some of the checkboxes in the challenge configuration is leading to a 422.

Running in dev

Seems to be a 5.2 upgrade issue

rails/rails@ec4a836

[scarroll32]

Temporary workaround 9fec8d6

From https://stackoverflow.com/a/48762137/993592

[spMohanty]

@seanfcarroll : Did you look at this : rails/rails#22965 (comment)

[scarroll32]

Thanks for the tip @spMohanty, I thought that could be the issue, esp with #747

But the issue also occurs locally where there is no CDN. After much investigation, the issue is somehow tied to Turbolinks + 5.2. There may be some gem dependency causing the issue, but I haven't tracked it down.
Disabled turbolinks on forms for now, more investigation to come when time permits.

[scarroll32]

Possibly related rails/rails#24257