How to get a slack notification when build fails? - drone.io

Question

When my build is successful I get a slack notification, when it fails I do not. Looking at the Drone web UI it looks like it stops once the build fails and the slack plugin is never run.
A successful build results in notify happening:
A failed build does not get to the notify stage:
The key parts of the .drone.yml are as follows:
build:
image: propheris/ruby:2.4.0
secrets: [gems_password]
commands:
- exit 0
notify:
image: plugins/slack
webhook: https://example.com/hooks/token
channel: dev
username: drone
icon_emoji: drone
I change exit 0 or exit 1 to simulate a successful or failed build.
Drone 0.7
plugin/slack

Answer 1

I've taken a look at the docs and it seems your missing the following line:
when:
status: [ success, failure ]
The docs state:
Example configuration for success and failure messages:
pipeline:
slack:
image: plugins/slack
webhook: https://hooks.slack.com/services/...
channel: dev
when:
status: [ success, failure ]
You can also add custom messages:
Example configuration with a custom message template:
pipeline:
slack:
image: plugins/slack
webhook: https://hooks.slack.com/services/...
channel: dev
template: >
{{#success build.status}}
build {{build.number}} succeeded. Good job.
{{else}}
build {{build.number}} failed. Fix me please.
{{/success}}