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Migrate paragraph field from drupal 7 to drupal 9

I am using drupal 9. I have events on my drupal 7 websites and after the drupal version update, I want to migrate those events to the drupal 9 website. Event CT has a paragraph reference revision field to the ‘event_date’ paragraph on the drupal 9 website. Inside the paragraph, there are fields like field_city, field_country, and others. But on the drupal 7 project this paragraph has a location field referenced to the location entity. Now I want to migrate field_location (referenced to location, inside location there are the city, country fields) from drupal 7 to feld_country, field_city on drupal 9. I have wroten migration_plus yml for event_paragraph migration, but am unable to write migration for the reference field. Here is my migration yml file:

id: paragraph_event_date label: 'Paragraph event_date' migration_group: event_migrate migration_tags:   - location   - paragraph source:   plugin: d7_paragraphs_item   bundle: event_date   key: migrate process:   field_city:     plugin: sub_process     source: field_location     process:       value:         plugin: format_date   field_event_date_range:     plugin: sub_process     source: field_event_date     process:       value:         plugin: format_date         source: value         from_format: 'U'         to_format: 'Y-m-dTH:i:s'       end_value:         plugin: format_date         source: value2         from_format: 'U'         to_format: 'Y-m-dTH:i:s'   field_sold_out:     plugin: sub_process     source: field_sold_out     process:       value: value       langcode: language   field_end_date_unset:     plugin: sub_process     source: field_end_date_unset     process:       value: value       langcode: language destination:   plugin: 'entity_reference_revisions:paragraph'   default_bundle: event_date migration_dependencies: { } dependencies:   enforced:     module:       - twn_event_migrate

So my mapping should look like that

 field_city = field_location <-- location <-- city

Drupal 9 paragraph__field_city enter image description here

Drupal 7 paragraph__field_location

enter image description here

Drupal 7 location field enter image description here

This article was republished from its original source.
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Migrate paragraph field from drupal 7 to drupal 9

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