I'm trying to get my users to post only once on each Product node... I'm kind of new to hooks and I'm not sure what else should I use for this.
What is the drupal way to do this?
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You can use the Comment limit module.
Limits how many comments a user may post on a node. Adjustable on a per node type basis.
This module can be handy for instance when comments are used as "Reviews" and "Ratings" for products and a user may only review and rate a product once.