RA v4 blocks validation due to empty array

What you were expecting: Before RA v4, returning an empty array from the validator meant that RA treated the form as being valid. After the new update it seems that this is no longer the case, and we get a popup saying that form isn’t valid.

Not sure if this is a bug, or if it’s new behaviour that needs to be documented.

You can test this out here

You can enter some text into the array field.

If the value is less than 2 characters, it will add an array to the backlinks’ error array. if it’s larger, then it’ll just return the empty array.

What do you suggest, is this a bug or just a change in behaviour?

What happened instead:

Steps to reproduce:

Related code:

• Preferably, a CodeSandbox forked from https://codesandbox.io/s/github/marmelab/react-admin/tree/next/examples/simple
• A link to a GitHub repo with the minimal codebase to reproduce the issue

insert short code snippets here

Other information:

Environment

• React-admin version:
• Last version that did not exhibit the issue (if applicable):
• React version:
• Browser:
• Stack trace (in case of a JS error):

[WiXSL]

@fzaninotto, I don’t think @andrico1234 read it anywhere, he is just implying that react-final-form allowed this “undocumented” behavior, and now react-admin v4 doesn’t.

[fzaninotto]

OK, I didn’t manage to do it in 5 minutes, so I’ll let it open for anyone willing to try. The solution probably comes from https://github.com/lodash/lodash/issues/2240.