Metatags trimmed body in description/summary

Question

I am using the Metatag Module. Everything works as expected, till I checked the description for each node and saw that it is empty.

Since there is no output with [node:summary] I changed it to [node:body] which works, but now the whole node is in the description field... I checked the available tokens [*:summary, *:value, *:format] with no success.

Any suggestions how to use the [node:body] in a trimmed version?

Answer 1

You can use any field with Metatag, so simplest way would be to use Computed Field, that

lets you add a custom "computed fields" to your content types. These computed fields are populated with values that you define via PHP code. You may draw on anything available to Drupal, including other fields

In your custom php code for field computation, use code like this:

$body = $entity->body['und'][0]['value'];
$width = 160;
$body_trimmed = substr($body, 0, strpos(wordwrap($body, $width), "\n"));
$entity_field[0]['value'] = $body_trimmed;

It will truncate on the word boundary, giving you no more than $width characters. More about truncating on StackOverflow.

Then, simply feed this computed field to Metatag.

Answer 2

Thanks @Molot!

I was looking for a way to put a trimmed description field into another field called summary. You would think Drupal would do this automatically but the summary field is only populated if a user enters it manually.

My code looked like this:

$desc = $entity->field_prj_desc['und'][0]['value'];
$width = 140;
$desc_trimmed = substr($desc, 0, $width);
$entity_field[0]['value'] =  $desc_trimmed;