Changed Fields API

API for developers that allows reacting on changed fields in a node (any entity since 8.x-3.x) when the node has been updated. It includes two demo modules: changed_fields_basic_usage and changed_fields_extended_field_comparator.

Use cases

• You use services and services_client modules to deploy nodes on different sites and you want to avoid false positive requests (when node saved but nothing changed inside the node)
• You want to modify node object depends on changed fields values.
• You want to know which fields have been changed before node would be saved
• Some other useful things

Supported field types for Drupal 8/9/10

All core's field types

Usage for Drupal 8/9/10

Please consider this Changed Fields API Drupal 8 usage guide.

What's new in 8.x-3.x?

• Drupal 10 compatible (since 8.x-3.5 release)
• Drupal 9 compatible (since 8.x-3.4 release)
• Any Drupal 8/9/10 entity support!
• Class NodeSubject is replaced by more generic EntitySubject class.

Please see detailed description here.

Supported field types for Drupal 7

All core's field types

Additional field types:

• date (date module)
• datestamp (date module)
• datetime (date module)
• phone (phone module)
• email (email module)
• link_field (link module)
• entityreference (entityreference module)
• field_collection (field_collection module)

Usage for Drupal 7

Please consider this Changed Fields API Drupal 7 usage guide.

Difference between 7.x-2.x and 7.x-3.x branches

1. Branches are not compatible.
2. 7.x-3.x is built on spl interfaces instead of custom ones.
3. In 7.x-3.x you can define different observers with different observable bundles and its fields. In 7.x-2.x all the attached observers could observe only that bundles and its fields that were defined in subject object.

If you already use 7.x-2.x and you don't need new feature then you can stay on this version. If you haven't used this module yet but want to use it then install 7.x-3.x version.

Please see detailed description here.