External fields might not work in tools

[adrianthedev]

Describe the bug

I tried to use the new marksmith field on avodemo and figured it does not work on resource tools.

I narrowed it down to here. I think we should use this strategy.

Reproduction repository for the bug

Steps to use in the reproduction repository

Steps to reproduce the behavior:

1. Go to https://main.avodemo.com/avo/resources/cities/1230/edit
2. see the page crash

Expected behavior & Actual behavior

System configuration

Avo version:

Rails version:

Ruby version:

License type:

• [ ] Community
• [ ] Pro
• [ ] Advanced

Are you using Avo monkey patches, overriding views or view components?

• [ ] Yes. If so, please post code samples.
• [ ] No

Screenshots or screen recordings

Additional context

Impact

• [ ] High impact (It makes my app un-usable.)
• [ ] Medium impact (I'm annoyed, but I'll live.)
• [x] Low impact (It's really a tiny thing that I could live with.)

Urgency

• [ ] High urgency (I can't continue development without it.)
• [ ] Medium urgency (I found a workaround, but I'd love to have it fixed.)
• [x] Low urgency (It can wait. I just wanted you to know about it.)