Forum Development
A forum is a platform for asynchronous topic discussions. Unlike chats (real-time) and social networks (post feeds), forums organize discussions hierarchically: section → topic → replies. Users value forums for the ability to search and find relevant discussions years later.
Forum Structure
Forum
├── Section "General Questions"
│ ├── Topic "How to configure nginx?" (15 replies)
│ └── Topic "CI/CD best practices" (8 replies)
├── Section "Announcements" (read-only for guests)
│ └── ...
└── Section "Off-topic"
Nested subsections are optional, depending on scale.
Nested Comments vs Flat Replies
Two approaches to displaying replies:
- Flat (Reddit-style): all replies on one level, sorted by date or rating. Simpler to implement.
- Nested (threaded): replies to specific comments appear as children. Better for long discussions.
Store nested comments using Closure Table or Adjacency List:
-- Adjacency List
CREATE TABLE posts (
id, topic_id, parent_id REFERENCES posts(id),
author_id, body TEXT, created_at
);
For deep nesting—use Nested Sets or Materialized Path (path: 1.5.12.44).
Access Permissions
Classic forum roles: Guest (read), Member (write), Moderator (edit/delete), Admin. Additionally—section-specific: section X moderator doesn't moderate section Y.
Special groups: "Trusted Users" (no CAPTCHA), "Banned" (read-only or full ban).
Moderation
- Reports: "Report" button → moderator queue
- Flood protection: limit posts per N minutes from one user
- Spam filtering: Akismet for links + honeypot fields in forms
-
Soft delete: posts not physically deleted, marked as
deleted. Moderators can view original text. - Edit history: all post changes preserved
Reputation System
- Likes/dislikes: affect answer sorting and author reputation
- Marked as solution: in Q&A mode, topic author marks best answer (green checkmark)
- Badges: achievements for activity (first post, 100 replies, 10 "solutions")
Search
Full-text search across post titles and bodies. For forums with large historical archives (10+ years)—Elasticsearch with Cyrillic morphology. For new projects—PostgreSQL FTS sufficient up to several million records.
Subscriptions and Notifications
- Topic subscription—email on each new reply or digest
- Section subscription—notification of new topics
- @mention—notification when mentioned in a post
Timeline
MVP (sections, topics, replies, permissions, basic moderation): 6–8 weeks. Full-featured forum with nested replies, reputation, search, mobile version: 3–4 months.