Testing Tokens with Entity Ref Traversal via Drush
I am working on a project that has some complicated depth. I needed a way to quickly test token replacement. It’s pretty simple when you understand a few things.
Example Architecture
Here’s the Drupal architecture for this example:
- Discussion Group (content type)
- Title
- Intro
- Body
- “Associated Experts” paragraph field (allows one “Associated Experts” paragraph item)
- Associated Experts (paragraph type, used by many content types like Discussion Group above)
- Heading
- Intro
- Experts (allows unlimited number of “Expert” nodes)
- Expert (content type)
- Title
- Photo
So, the structure of a node looks like this:
- Discussion Group node
- Title
- Body
- Associated Experts
- Associated Expert 0 (there is only one)
- Heading
- Intro
- Experts (there may be many)
- Expert 0
- Title
- Photo
- Expert 1
- Title
- Photo
- etc…
- Expert 0
- Associated Expert 0 (there is only one)
Testing a Token with Drush
Using the token service via Drush is simple. In these examples I’m passing a node object, but you can pass other entity types similarly.
drush ev 'print Drupal::token()->replace("[node:title]", ["node" => \Drupal\node\Entity\Node::load(6)]);'Token Examples
Example 1: Get a Discussion Group title
[node:title]
Example 2: Get a Discussion Group node’s “intro” field
[node:field_dg_intro]
Example 3: Get an associated expert paragraph bundle’s “heading” field
this demonstrates entity reference traversal using the special entity chain mechanism
this also demonstrates how to specify a delta on a multiple-value field
[node:field_dg_experts:entity:field_assoc_expert_heading] or [node:field_dg_experts:0:entity:field_assoc_expert_heading]
Example 4: Get the second associated expert node’s title
[node:field_dg_experts:entity:field_assoc_expert_refs:1:entity:title]
Example 5: Get the third associated expert node’s photo URL
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1 |
[node:field_dg_experts:entity:field_assoc_expert_refs:2:entity:field_expert_photo:entity:url] |