Data loss on Content preview

[jordanaubert]

Not sure if really a bug but there is a specific case where fields are removed on content preview.

Details

Question	Answer
Relevant Bolt Version	5.1.4
Install type	Composer install
BC Break	no
PHP version	7.4

Reproduction

The condition is to have a contentType with bad typed field, for example :

entries:
    name: Entries
    singular_name: Entry
    fields:
        title:
            type: string # instead of text
            class: large
            group: content

On edit, we can save the content with a valid title, but the field will be persisted with the generic type

After some investigation, I understood that the field is removed beforehand because of the type check in hasField https://github.com/bolt/core/blob/2d02f5d4893ab00ea18ca5d2a909e30c71102f18/src/Controller/Backend/ContentEditController.php#L483-L493

The point is that the Preview behaviour is to reproduce the Save behaviour without persist, but the removed field is still flushed, thus losing data.

I know the issue won't happen with a correct configuration but I still wanted to warn those who'd face the same case as me.

[github-actions[bot]]

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