Installation
You can install rest_framework_channels via pip.
pip install rest_framework_channels
Setting
After installing it, you should insert 'rest_framework_channels' in the INSTALLED_APPS.
INSTALLED_APPS = [
    # Websocket
    'daphne',
    'channels',
    'rest_framework_channels', # add
    ...
You can configure the default classes and so on in settings.py.
REST_FRAMEWORK_CHANNELS = {
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework_channels.permissions.AllowAny'
    ],
    'JSON_ENCODER_CLASS': None,
    # Generic action handler behavior
    'DEFAULT_PAGINATION_CLASS': None,
    'DEFAULT_FILTER_BACKENDS': [],
    # Pagination
    'PAGE_SIZE': None,
}
Important
The configuration for all settings except DEFAULT_PERMISSION_CLASSES is same as original rest_framework.
See docs for more details.