How do I write migrate group files?

Question

I'm trying to create a Migrate group with following code. But it is not detected & listed in admin/structure/migrate. Both migrate plus & Migrate tools modules are installed. I"m trying to create migration from WordPress tables. The module is called migrate_wordpress & migrate group is defined in config/install with the name migrate_wordpress. migrate_group.wordpress.yml

id: wprdpress
label: WordPress Imports
description: Import from WordPress blog
source_type: Custom tables

What is wrong with above Migrate group configurations? What is the correct way to write an migrate group configuration file in Drupal 8?

Answer 1

I believe that groups are a feature of the migrate_plus module. In order for them to be recognised, the file needs to be named migrate_plus.migration_group.<group_name>.yml. The actual migrations also need to be formatted like this migrate_plus.migration.<migration_name>.yml.

One other issue I see is that your id: wprdpress should be id: wordpress. (Just in case that typo is in your code :) )

The last thing is that migrations are only defined on module install. This means that you have to uninstall and re-install every time. (Or you can implement some drush commands to do it for you. Check out this tutorial.)

Answer 2

In .yml file we define four major parts for Migration. These are id, source, process and destination. Id is to identify this Migration process Id to identify. Source is defined with the data source. Process define basically the mapping of fields in between destination and source. It seems you are missing process and destination. To define Migration group you can define it like this

migration_group: custom
destination:
    plugin: entity:file

You can refer this Migrate Module as well.