0

I have a nested field called released with three values

  • By
  • When

A node can have multiple releases. However, in the old dataset (d7), each node only had one release and the fields just a part of the node.

I want to now migrate it to the new format in d8

If it was just one value, I could do this

released/by: field_released_by
released/when: field_released_at

I tried the solution at https://www.freelock.com/blog/john-locke/2017-12/slick-migration-trick-convert-columns-multi-value-field-subfields which didn't help. It tried to look up the dummy fields and caused it to fail.

I can't be the first person to come across this requirement so I am loathe to write a process plugin for it.

Is there a straightforward solution for this? or is a process plugin the only way?

1

Turns out the answer on that page is correct, just out of date. Instead of Iterator, it needs sub_process. It also needs a nested array

To create the nested array, I start with a temporary field with the two items it needs

tmp_single_published:
  plugin: get
  source:
    - field_published_by
    - field_published_at

I then plug it into another array and process it.

published:
  plugin: sub_process
  source:
    - '@tmp_single_published'
  process:
    uid: '0'
    at: '1'

This worked for me

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.