Field Migrator

Field Migrator (wp-field-migrator) adds an admin interface to preview and migrate values from one field into another for a selected post type.

Access

• WordPress Admin -> Tools -> Field Migrator
• URL: /wp-admin/tools.php?page=wp-field-migrator

Current capabilities

• Source -> target field mapping for a selected post type.
• Field pickers grouped by:
  • Core Fields
  • ACF Fields (Active)
  • ACF Fields (Inactive)
  • Detected Meta Keys
• Optional Custom meta key... fallback for source and target.
• Optional toggle to show internal/private keys (_meta_key).
• Paginated preview (Page, Per Page).
• Preview All Changes (Append) to stream/append preview rows across all posts in async batches.
• Stop Preview Appending to halt append mode.
• Export Dry-Run CSV (All Posts) to download full preview output without writing changes.
• Async migration across all posts with configurable Migration Batch Size.
• Efficient cursor/keyset batching (ID > last_id) to avoid large offset queries.
• Skips rows with empty source values and rows where target already matches source.
• Run history with per-run status/totals, failed IDs, and downloadable CSV run reports (including per-batch logs).
• Nonce + capability checks for actions.

Core field names

You can map to/from these special core fields:

• core:post_title
• core:post_content
• core:post_excerpt

Example

Migrate description -> location on exhibition posts:

1. Open Tools > Field Migrator.
2. Set Post Type to exhibition.
3. Set Source Field to description (or select from dropdown).
4. Set Target Field to location (or select from dropdown).
5. Click Preview Changes and review results.
6. Optionally run Preview All Changes (Append) for full-scan preview.
7. Click Run Migration (Async, All Posts).

Safety

• Back up your database before using this tool.
• Migrations can irreversibly modify post data.
• Test first on staging.

Notes

• Migration copies source values into target values.
• Source fields are not cleared automatically.