I'm using Drupal 8.1 with Rules 8.x-3.0-alpha1.
I want to create a rule to send an email to the author of a node when a new comment is posted to this node. Problem is I didn't get the email address of the author with rules because the dataset gives me only this values: @node.node_route_context:node or comment but under comment I didn't find anything like comment:node:author. In Drupal 7 I have this data. What I have to do in Drupal 8?
Updated Answer
Whilst testing this on a fresh install of Drupal 8 with Rules (Alpha 2) I have come across a bug which is preventing a successful test of this, whilst the data selector below is correct I am presently unable to reproduce a working rule.
The bug report is here: https://www.drupal.org/node/2770291 - To summarise this issue Rules is expecting the TO: parameter to be an array and will throw an error when passing the email address token below which returns a string.
My initial answer holds true for Drupal 7 however for Drupal 8 the situation seems simpler and hinges on a single fact that isn't yet well-documented.
In D7 we're familiar with a syntax resembling: comment:node:author:mail
In D8 the same selector (which works) is: comment.entity_id.entity.uid.entity.mail.value
Hopes this helps, I'm leaving the previous answer below in case it helps someone else.
Previous Answer
*In general with Rules to use the value of a field the rule must first specifically check for the existence of the field (i.e. that the field has a value in the context the rule is running). If you haven't tried this already you might want to try adding an "Entity has field" condition to the rule to check for the existence of the email address. This should then expose the token for the field.
I've had similar issues executing rules using entity relations (which is more or less what you're doing by referencing the author from the node) checking for the existence of the field (in your case most likely a check that the entity has an author (this should open up access to the user object) then a check against the user object to ensure it has an email address) opened up the available field tokens from the referenced entity.*
There's a working example in the Rules issue queue that was posted in November 2016, so this has been possible at least since then. See https://www.drupal.org/project/rules/issues/2828422
Here's a slightly modified version of that answer. You may import this into your site and look at it in the UI to learn how to configure this functionality.
langcode: en
status: true
dependencies: { }
id: 'email_node_author_on_new_comment'
label: 'Email Node Author on New Comment - Issue 2828422'
events:
-
event_name: 'rules_entity_insert:comment'
description: 'Sends email to Node Author when a New Comment is added.'
tags:
- node
- email
- comment
config_version: '3'
expression:
id: rules_rule
uuid: b5276280-d0f2-4f64-9512-06f077793c58
conditions:
id: rules_and
uuid: ebf212fc-d858-417d-977d-af1be2cfd886
conditions: { }
actions:
id: rules_action_set
uuid: 88a78280-2bca-4367-a4d3-8bbda9397c2a
actions:
-
id: rules_action
uuid: 5e6e5aed-b75f-412a-9670-48327eb58ba6
context_values:
to:
- '{{ comment.entity_id.entity.uid.entity.mail }}'
subject: 'Your content {{ comment.entity_id.entity.title }} has a new comment.'
message: 'Your content {{ comment.entity_id.entity.title }} has a new comment.'
reply: ''
language: ''
context_mapping: { }
context_processors:
to:
rules_tokens: { }
subject:
rules_tokens: { }
message:
rules_tokens: { }
reply:
rules_tokens: { }
language:
rules_tokens: { }
provides_mapping: { }
action_id: rules_send_email