# Tip #34 — User-Comments on recipes

**Date:** 2026-07-15  
**Category:** social  
**Source:** MC-Survival Wiki Daily Tip (backfilled from state.json)  
**Note:** *Title was truncated in the original state.json log. Body matches the 'Search-Synonyms alias table' variant of the same idea.*

## User-Comments on recipes

A comments feature is a Comment { id, userId, recipeId, body, parentId? } Prisma model with threaded replies, markdown rendering with sanitization, and moderator soft-delete. It solves the dead-wiki problem: a read-only wiki is a one-time-visit resource, and the lowest-effort social loop that turns visitors into a community is the comment thread. The signal is engagement analytics — wikis without comments have a return-visit rate that decays sharply, while wikis with active threads pull users back multiple times per week. Sanitization with DOMPurify or rehype-sanitize is non-negotiable, since markdown from anonymous users is a known XSS vector.

## Implementation tips

1. New Prisma model: Comment { id, userId, recipeId, body, parentId?, createdAt } — threaded via parentId.
2. Markdown rendering with sanitization (DOMPurify or rehype-sanitize) — never trust user input raw.
3. Admin can soft-delete with a 'removed by moderator' placeholder so the thread keeps structure.