Thumbnails in 5.7 - how to force generation of a new thumbnail for existing files ?
PermalinkI added a new thumbnail declaration programmatically for my site. I then use that thumbnail through
$file->getThumbnailURL($type->getBaseVersion());
This works great for new files. However, existing files that were uploaded before I made that change do not have that thumbnail and I get the original much bigger image instead of the thumbnail.
One workaround I found was to edit and then immediately save a file - then the thumbnail is generated. But that's not very acceptable with hundreds of existing files.
It there a way to force the generation of all the missing thumbnails either through the backoffice or programmatically ?
What is the purpose of the 'required' flag for the thumbnail generation ? I set it to true, but I'm not sure of it's exact purpose.
UPDATE-----
Actually it appears you can rescan a batch by clicking the tick box in the top blue panel in File Manager and then select 'Rescan' under the 'Items Selected' dropdown.
Example image attached.