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otreechat 0.1.5

oTree chat.

Latest Version: 0.1.6

Chat rooms for oTree so that participants can communicate with each other.

This is an early beta version and subject to changes/improvements!


(Assuming you already have an oTree project.)

pip install -U otreechat

In your project root, next to, create a file containing this:

from otree.channels.routing import channel_routing
import otreechat.routing
channel_routing += otreechat.routing.channel_routing


  • Set CHANNEL_ROUTING = 'routing.channel_routing' (this is the dotted path to your channel_routing variable in
  • Add 'otreechat' to INSTALLED_APPS, e.g. INSTALLED_APPS = ['otree', 'otreechat']

Then run otree resetdb.


Basic usage

Add this to the top of your template:

{% load otreechat %}

Then wherever you want a chatbox in the template, use:

{% chat %}

This will make a chat room among players in the same Group, where each player’s nickname is displayed as “Player 1”, “Player 2”, etc. (based on the player’s id_in_group).

Customizing the nickname and chat room members

You can pass optional parameters channel and/or nickname like this:

{% chat nickname=mynickname channel=mychannel %}


nickname is the nickname that will be displayed for that user in the chat. A typical usage would be {% chat nickname=player.role %}.


channel is the chat room’s ID, meaning that if 2 players have the same channel, they can chat with each other. channel is not displayed in the user interface; it’s just used internally. Its default value is, meaning all players in the group can chat together. You can use channel to instead scope the chat to the current page or sub-division of a group, etc. (see examples below). Regardless of the value of the channel argument, the chat will at least be scoped to players in the same session and the same app.

Example: chat by role

Here’s an example where instead of communication within a group, we have communication between groups based on role, e.g. all buyers can talk with each other, and all sellers can talk with each other.

class Player(BasePlayer):

    def role(self):
        if self.id_in_group == 1:
            return 'Seller'
            return 'Buyer'

    def channel_nickname(self):
        return 'Group {} {}'.format(, self.role())

Then in the template:

{% chat nickname=player.channel_nickname channel=player.role %}
Example: chat across rounds

If you need players to chat with players who are currently in a different round of the game, you can do:

{% chat channel=group.id_in_subsession %}
Example: chat between all groups in all rounds

If you want everyone in the session to freely chat with each other, just do:

{% chat channel='everyone' %}


To customize the style, just include some CSS after the {% chat %} element, e.g.:

{% chat %}

    .otreechat .messages {
        height: 400px;
    .otreechat .nickname {
        color: #0000FF;
        font-weight: bold;

Multiple chats on a page

You can have multiple {% chat %} boxes on each page, so that a player can be in multiple channels simultaneously.

For example, this code enables 1:1 chat with every other player in the group.

class Player(BasePlayer):

    def chat_nickname(self):
        return 'Player {}'.format(self.id_in_group)

    def chats(self):
        channels = []
        for other in self.get_others_in_group():
            if other.id_in_group < self.id_in_group:
                lower_id, higher_id = other.id_in_group, self.id_in_group
                lower_id, higher_id = self.id_in_group, other.id_in_group
                # make a name for the channel that is the same for all
                # channel members. That's why we order it (lower, higher)
                'channel': '{}-{}-{}'.format(, lower_id, higher_id),
                'label': 'Chat with {}'.format(other.chat_nickname())
        return channels
{% for chat in player.chats %}
    <h4>{{ chat.label }}</h4>
    {% chat nickname=player.chat_nickname %}
{% endfor %}


  • Exporting of chat logs not yet implemented, coming soon
  • Remember to put otreechat in your requirements_base.txt so you can use it on the server, etc.
File Type Py Version Uploaded on Size
otreechat-0.1.5.tar.gz (md5) Source 2017-02-17 8KB