Add a discussion forum to Trac

Notice: This plugin is unmaintained and available for adoption.


This plugin adds discussion forum capabilities to Trac.

Key features:

  • Any number of forums can be added and organized in forum groups.
  • Users can create topics in forums and reply to them, which together create discussion threads.
  • Threaded or flat view to topics and its replies is supported.
  • Each forum has a list of moderators who can delete topics, replies, etc.
  • Appending new forums and topics either as new replies shows up in timeline.
  • Searching capability in topics and replies is supported too.

The plugin is administrated directly or via the Trac administration interface with appropriate permissions granted.

Discussion list:

Screenshot of discussion listing.

Admin page:

Screenshot of administration interface.


Screenshot of message list in a thread.

Bugs/Feature Requests

Existing bugs and feature requests for DiscussionPlugin are here.

If you have any issues, create a new ticket.


140 / 145


49 / 59


7 / 8


Download the zipped source from here.

The plugin is also available on PyPI.


You can check out DiscussionPlugin from here using Subversion, or browse the source with Trac.



If you need spam filtering features, then the SpamFilterPlugin is required. In other cases, disable the DiscussionSpamFilter component.

Sqlite version 3 or PostgreSQL is required as the database for running this plugin.

Plugin versions

General instructions on installing Trac plugins can be found on the TracPlugins page.


The plugin is configurable from trac.ini file, see TracIni for more on this topic. The following variables controls DiscussionPlugin's behavior:

title = Discussion
default_topic_display = classic
default_message_display = tree
forum_sort = lasttopic
forum_sort_direction = asc
topic_sort = lastreply
topic_sort_direction = asc
topics_per_page = 30
messages_per_page = 50
smtp_always_cc = 


changes title of main navigation bar button,
changes between two possible displays of topic list - the classic and the compact view.
defines default display mode for message list. Possible values are tree, flat, flat-asc and flat-desc. flat is synonym for flat-desc.
is column by which will be sorted forum lists. Possible values are:
  • id,
  • group,
  • name,
  • subject,
  • time,
  • moderators,
  • description,
  • topics,
  • replies,
  • lasttopic and
  • lastreply.
to sort Topic lists. It has values
  • id,
  • forum,
  • subject,
  • time,
  • author,
  • body,
  • replies and
  • lastreply.
forum_sort_direction and topic_sort_direction
are directions of that sorting:
  • asc and
  • desc.
topics_per_page and messages_per_page
options controls number of items displayed in topic and message lists at each page of pagination.

You can type a list of email addresses into smtp_always_cc option to send all discussion plugin email notification to them. Previous example shows default values for these options.

If you run Trac in an environment which needs to enable plugins explicitly, put in trac.ini these lines:

tracdiscussion.admin.DiscussionWebAdmin = enabled
tracdiscussion.api.DiscussionApi = enabled
tracdiscussion.core.DiscussionCore = enabled
tracdiscussion.init.DiscussionInit = enabled
tracdiscussion.notification.DiscussionEmailNotification = enabled = enabled
tracdiscussion.spamfilter.DiscussionSpamFilter = enabled # Optional, disable if you don't have SpamFilterPlugin.
tracdiscussion.timeline.DiscussionTimeline = enabled = enabled
tracdiscussion.tags.DiscussionTagProvider = enabled
tracdiscussion.tags.DiscussionTags = enabled
tracdiscussion.ajax.DiscussionAjax = enabled

The next step is to upgrade your environment:

$ trac-admin <path_to_environment> upgrade


This plugin defines the following permissions:

  • With DISCUSSION_VIEW permission you can view all topics and you can post replies to them with DISCUSSION_APPEND permission.
  • Attachments can be added to the topics with DISCUSSION_ATTACH permission.
  • The DISCUSSION_MODERATE permission gives you rights to delete replies or topics where you are defined as a moderator.
  • The DISCUSSION_ADMIN permission gives you administrator rights to create, modify or delete forum groups, forums and topics.

You can add these permissions by typing the following commands from commandline or you can use web administration interface to do it for you:

$ trac-admin <path_to_environment> permission add <user> DISCUSSION_VIEW
$ trac-admin <path_to_environment> permission add <user> DISCUSSION_APPEND
$ trac-admin <path_to_environment> permission add <user> DISCUSSION_ATTACH
$ trac-admin <path_to_environment> permission add <user> DISCUSSION_MODERATE
$ trac-admin <path_to_environment> permission add <user> DISCUSSION_ADMIN


There are a few wiki macros available:

[forum:<forum_id> <text>]

Displays a link to forum with id <id> and text <text>. Second argument is optional.

[topic:<topic_id> <text>]

Displays a link to topic with id <id> and text <text>. Second argument is optional.

[message:<message_id> <text>]

Displays a link to reply with id <id> and text <text>. Second argument is optional.

[last-forum:<forum_group_id> <text>]

Displays a link to the last forum created in forum group with id <id> and text <text>. Second argument is optional.

[last-topic:<forum_id> <text>]

Displays a link to the last topic created in forum with id <id> and text <text>. Second argument is optional.


Displays content of topic with subject <topic_subject>. If no subject is given, then it displays the content of the topic with same subject as the name of the current wiki page. Currently there is a limitation of post length using this macro, because of using GET method of the HTML form.

[[RecentTopics(<forum_id>,<number_of_topics>)]] or [[RecentTopics(<number_of_topics>)]]

Displays list of recently changed topics in a forum <forum_id> or in all forums, if <forum_id> is not specified, grouped by the day of their last change. Second argument <number_of_topics> limits the number of recently changed topics displayed.


Discuss this on the [forum:5 Trac Development forum]. 
Useful threads are [topic:23 this one] and [topic:96 this one].


Foreign files can also be attached to topics and then linked in replies. For this purpose you can use general Trac attachment link syntax with discussion domain and topic resource:


There are also two custom macros doing the same and they simplify the syntax a bit:


Change Log

17854 by rjollos on 2020-08-21 20:44:35
TracDiscussion 1.2.2dev: Make compatible with Trac 1.4+

Fixes #13877.

17713 by rjollos on 2020-04-30 01:50:36
TracDiscussion 1.2.2dev: Use authorinfo to format name in topic list

Refs #13778.

17637 by rjollos on 2019-12-19 09:35:13
TracDiscussion 1.2.1: Publish to PyPI

Refs #13659.



Author: Blackhex
Maintainer: none (needsadoption)
Contributors: athomas, hasienda, lucid, rjollos

Last modified 4 years ago Last modified on May 13, 2020, 11:07:11 PM

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