Introduction of draft versions to be able to work with a page without publishing every action

Indeed, this is a very important aspect of the full solution. Since Geysir allows authors to manipulate pages in such a quick way, we definitely need a way to "group" these changes and publish them all at once. A few things are needed here:

• A way to "start" a group of changes. This maps to the concept of revisions in Drupal. We need a way to have a draft version of a page without affecting the published version.
• A clear indication for authors when they start editing a page whether there is already a draft existing or not
• A way to compare the new draft version of a page to the published version
• A trigger to publish the draft

In attachment there is a example screenshot of how part of that interface could look like.

Given this breaks revision handling, which is one of the key reasons to use Paragraphs over other referenced-entity solutions, this is a major bug, not a feature request.

The uploaded patch works only with the 8.x-1.0-alpha2 release.
I updated patch to works with the actual 8.x-1.0-dev branch.

Updated the patch to work with updated 8.x-1.x-dev branch.
Also updated the add routes & modal functions with the parent_entity_revision parameter.

@szato @andywhale Can you test & review this please?

Patch in #8 gives me an error when applied against latest 1.x-dev:

Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("parent_entity") to generate a URL for route "geysir.modal.add_form". in Drupal\Core\Routing\UrlGenerator->doGenerate() (line 182 of /srv/bindings/e8725ad852ef475fa76b0aeb0e40fb3a/code/core/lib/Drupal/Core/Routing/UrlGenerator.php).

This error is seen in the log when viewing a node that has Paragraphs enabled. Patch was applied to existing install of Geysir module(1.x-dev), if it is helpful.

EDIT: Uninstalling/reinstalling patched module cleared errors, and is now working correctly.

Hi jover,

I tested the #8 patch with core 8.4.4 + paragraphs dev-1.x + workbench_moderation 8.x-1.2. It's working.

I tested the patch #8 on Drupal 8.4.4 using Geysir 8.x-1.x-dev and the core content_moderation + workflows modules.

When working on draft versions of a page, I experience several situations in which the changed made through Geysir are not reflected in the page when the modal closes. Moreover, I've seen cases in which I edited a paragraph, data from another revision is loaded in the modal.

I have to do further tested to dig out and clarify these issues.

Patch #8 has an issue with workbench_moderation module. If you edit a content which has enabled revision control and you actually edit a Draft unpublished content, added new paragraphs won't appear after ajax response (adding to a published worked). I attach a patch which fix this issue.

The last patch in #12 works good. The problems mentioned in #11 are now solved.

One side issue to be tackled: once a draft is created for a node, we should prevent further edits on the published revision. If not, conflicts will arise between the latest revision (draft) and the published revision. I would say edits directly on the published revision should remain possible (to correct typos e.g., but once a draft is present, this should be prevented. I created a new issue for this: https://www.drupal.org/project/geysir/issues/2939188

Patch committed.