migrate

Drupal's migration system allows the use of a number of different plugins to perform source, processing, and destination functions. 

Process plugins are responsible for copying and sometimes manipulating data into the destination. There are a number of different process plugins that allow you to get data in different ways and and apply it to your destination fields.

Both the core Migrate module and the excellent Migrate Plus module contain a number of different process plugins that you can use to process your data in different ways.

I've been doing a bit of Drupal migration recently, and one of the tasks I have undertaken is to migrate "likes" from a Drupal 7 site to a Drupal 10 site.

The likes in the old Drupal 7 site were built using a custom module, with the Flag module was selected to provide the new functionality on the new Drupal 10 site. This meant that I needed to migrate the old custom structure into the entity structure provided by the Flag module.

To add further complication, it was possible to add likes to nodes and comments, which meant that the flags on the new side needed to be applied to two different types of entity. This was simple enough to do using two different types of flag entity; one for nodes and one for comments.

When moving a Wordpress install from one place to another there are a number of things you must be aware of. If you have created your templates properly you will have used calls to bloginfo('home') rather than using static links, but you will need to update these links to make your Wordpress install work properly.

Once the files are in place, the database connection details have been edited and the database created there are a number of things to alter in the database to make your Wordpress install work.

The most important changes are in the options table. There are two references to your URL in this table that must be altered to stop Wordpress redirecting back to your old site. This must be done via database access as Wordpress will redirect you when you try to login to the stie.