Usage of trigger event data in notification

Configuration
1

I’ve written a component which fires an event file_added when I add a new file to a folder. The event payload is the file path such that the event is:

<Event file_added[L]: file=/Users/robincole/.homeassistant/images/metro-north copy.jpg>

I can trigger a notification using the config below, but get an error when I try to access the trigger object in my message template:
image

image
image728×568 11.2 KB

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/robincole/Documents/Github/home-assistant/homeassistant/core.py", line 1006, in _event_to_service_call
    await service_handler.func(service_call)
  File "/Users/robincole/Documents/Github/home-assistant/homeassistant/components/notify/__init__.py", line 134, in async_notify_message
    kwargs[ATTR_MESSAGE] = message.async_render()
  File "/Users/robincole/Documents/Github/home-assistant/homeassistant/helpers/template.py", line 133, in async_render
    raise TemplateError(err)
homeassistant.exceptions.TemplateError: UndefinedError: 'trigger' is undefined

If anyone has advice on how to access the file path please let me know!
Yes I have read the docs :wink:

2

The automation requires data_template which is not available via the automations editor:

- action:
  - data_template:
      message: 'Created {{trigger.event.data.file}} in {{trigger.event.data.folder}}'
    service: notify.pushbullet
  alias: New file alert
  condition: []
  id: '1520092824697'
  trigger:
  - event_data: {}
    event_type: folder_watcher
    platform: event