How to catch changes to category only when a product is assigned to it ?

[PRAGSMATIC]

When a product is assigned to a category, I want to catch that change event and want to know which product is getting assigned to category ?

Similary if a super category is being assigned to a product, how to catch if what super category is being assigned ?

If a child category is being assigned to a super category, then how to catch that too ?

[PRAGSMATIC]

Can interceptor be created for Relations ? I though it could only be created for Models ?

[geffchang]

anurag.gupta.home24 I deleted my answer. You're right. I think we can't create interceptors for relations.

[former_member634920 · Accepted solution]

There are two ways to achieve that
1. Introduce Product and Category interceptor, check for corresponding Dirty attributes

2. If relation created directly create new AfterSaveListener to handle relation changes