In Drupal and other content management systems, a revision is a saved version of a piece of content. When you make changes to a piece of content, a new revision of the content is created. This allows you to track the changes that have been made to the content over time and to revert to an earlier version if necessary. This can be useful for a variety of purposes, such as:
- Reviewing the history of changes made to a piece of content
- Comparing the differences between two versions of the content
- Restoring a previous version of the content if needed
To compare revisions of content in Drupal, you will need to have the appropriate permissions to access the revision history of the content. If you have these permissions, you can compare revisions by following these steps:
- Log in to your Drupal site as an administrator or content editor.
- Find the content item you want to compare revisions for in the list on the content overview screen, and click the Revisions link next to it. This will take you to the Revisions page for the item, which displays a list of all the revisions that have been made to the content.
- Find the two revisions you want to compare in the list, and click the Compare link next to each revision. This will open a comparison view that shows the differences between the two revisions.
- In the comparison view, you can use the Previous and Next buttons to navigate between the different changes made in the two revisions. The changes are highlighted in different colors, with added or modified content displayed in green and deleted content displayed in red.
- When you are finished comparing the revisions, you can click the Close button to return to the Revisions page.
To revert a revision of a piece of content in Drupal, you will need to have the appropriate permissions to edit and revert revisions. If you have these permissions, you can revert a revision by following these steps:
- Log in to your Drupal site as an administrator or content editor.
- Find the content item you want to revert a revision for in the list on the content overview screen, and click the Revisions link next to it. This will take you to the Revisions page for the item.
- On the Revisions page, you will see a list of all the revisions that have been made to the content item. To revert to a specific revision, click the Revert button next to the revision you want to revert to.
- In the Revert revision form that appears, click the Revert button to confirm the revert.
Reverting to a revision will discard all the changes made to the content since the selected revision, and restore the content to the state it was in at the time of the revision. It's important to note that this is a permanent action and cannot be undone, so be sure to carefully consider whether you want to revert to a specific revision before doing so.