I am currently working on step 4 of the migration process. Currently, I foresee the following update procedure:
1. Initial state (Joomla 3.10.x, JoomGallery 3.6.x)
2. Update Joomla (Joomla 4.x, JoomGallery 3.6.x)
3. Update JoomGallery (Joomla 4.x, JoomGallery 4.x)
4. Data migration using Jg3ToJg4 migration script
During step 3 the JoomGallery installation script will rename the old JG3 database tables and deactivate all old JoomGallery extensions. Then it installs JoomGallery 4 like a fresh installation.
After step 3 you will have an updated JoomGallery looking and behaving like a newly, freshly installed JoomGallery 4. The data from the JoomGallery 3 will still be there in the background but just not visible in the component, since they are in parallel database tables.
Step 4 will then migrate the old data into JoomGallery 4.
A migration into another parallel Joomla 4 application will also be possible. Then you skip step 1-3 and start directly with step 4 (the migration script).
See Pull-Request at GitHub
This PR adds the migration service as well as a new MVC routine called migration.
A migration script called Jg3ToJg4 to migrate a JoomGallery v3.x to v4.x is already included. Additional migration script can be installed as an extension like in Jg3.
The migration view can be requested with the following URL: /administrator/index.php?option=com_joomgallery&view=migration
Additional comments during my tests you will find in the German version of this article.
