Export and import content revisions

[pbauer]

#105

[pbauer]

I think this is ready.

[mauritsvanrees]

LGTM, and it works for me when exporting a few Dexterity items from Plone 4.3 into Plone 6.0. The history viewlet looks the same afterwards. So fine to merge.

Just two inline comments that could be addressed. But since it works, I approve.
Thanks!

[fredvd]

Finally finished the ordeal of recording a screencast on my own. I'll quickly test this branch with the setup I used for recording my WPD talk.

[fredvd]

I have 'end user' tested with a small Plone 4.3.20 site with around 90 content items of which 10 documents. The revisions are exported and imported, but when I look into the revision details, only the number of revisions match. Import into Plone 6.0a4 classic setup.

• The date of all revisions is set to the date of the newest revision(live version).
• Also If I try to compare revisions no changes at all displayed. When I do this in the Plone 4 site I do see changes in the main text being highlighted etc. etc.
• the creation, initial revision and publish lines in the history have the correct author set. All subsequent revisions are ownd by the user under which I ran the import (admin).

[pbauer]

Oh, yes, I totally forgot a very important detail! I guess you tested exporting Archetypes content on 4.3.x?
To serialize versions of AT content you need this fix in plone.restapi: plone/plone.restapi#1335). It is merged in the branch 7.x.x of plone.restapi (8.x.x no longer supports AT) and until a new releasae of 7.x is done you need a source checkout. Sorry.