Migrate Paragraphs Subprocess

Provides a Migrate process plugin to pull entity_reference_revisions paragraphs from multiple paragraph-type migrations into a parent entity, preserving deltas and revisions.

Features

• Multi-migration support: Query multiple migrate_map tables to collect paragraphs from different paragraph-type migrations.
• Delta ordering: Respects original paragraph order by sorting on source delta.
• Revision preservation: Returns both paragraph entity IDs and revision IDs.

Post-Installation

After enabling, there is no UI. To use the plugin, simply reference it in your migration YAML:

process:
  field_paragraphs:
    - plugin: paragraphs_sub_process
      source: field_base_para_reference
      migration:
        - paragraph_type_one
        - paragraph_type_two
      process:
        target_id: '0'
        target_revision_id: '1'

migration_dependencies:
  required:
    - paragraph_type_one
    - paragraph_type_two

Clear caches (drush cr) and run your migration as usual.

Recommended modules/libraries

• Migrate Tools — for Drush and UI commands to run and roll back migrations.

Similar projects

• Migrate Paragraphs — only handles one paragraph migration; this plugin aggregates multiple paragraph-type migrations.