Document prefixes in InlineFormsets

[Jay Welborn]

When using ​inlineformset_factory to create an Inline Formset, django sets the formset's prefix to the related name from the child model. The ​Inline Formset topic guide doesn't mention this.

I struggled with this trying to test an InlineFormset, and I'd like to add an example to the documentation to clarify this behavior. If this is something the community wants, I'll write the example and send a PR.

[Tim Martin]

This looks good, thanks for documenting. I added one (and a half!) comments on the pull request.

[Jay Welborn]

Thanks for reviewing this. I agree printing the formset looked messy, so I've updated ​the PR

[Tim Martin]

Since you've addressed my comments, I think it's correct to remove the "patch needs improvement" flag so that it's visible in the reports. I'll re-review now.

[Tim Martin]

Looks good to me. The two commits will need to be squashed into a single commit that follows ​the guidelines for commit messages.

[Jay Welborn]

I squashed my commits, but now I'm failing one of the automated checks. Not exactly sure why, and I'm not super familiar with Jenkins.

If there's anything I can do on my end to fix it let me know.

[Tim Graham]

The latest version of the patch hasn't been reviewed yet.

[Carlton Gibson]

Patch looks good. It's just lacking an addition to AUTHORS (and query the CLA submission).

[Carlton Gibson]

Clearing the "Patch needs improvement" to not block on the AUTHOR edit and CLA submission.

[Tim Graham <timograham@…>]

In 56e590cc:

Fixed #28761 -- Documented how an inline formset's prefix works.

[Tim Graham <timograham@…>]

In e5acbbe:

[2.0.x] Fixed #28761 -- Documented how an inline formset's prefix works.

Backport of 56e590cc0be4d8c8b6fe0967583a6e02d18ee03e from master