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computed field inside field collection

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srini

I have two fields (field_a and field_b) which are inside the field_available_water_s field collection. I want to set the field_c computed field, which is also inside the field collection, to the sum of those fields.

I tried using this code, but it doesn't work.

$entity_field[0]['value'] = $entity->field_a[LANGUAGE_NONE][0]['value'] + $entity->field_b[LANGUAGE_NONE][0]['value'];

What code should I use?

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apaderno avatar Drupal
us flag
apaderno

In the Computed Code (PHP) textarea shown in the field settings of the computed field, you need to enter the following code.

$field_a = field_get_items($entity_type, $entity, "field_a");
$field_b = field_get_items($entity_type, $entity, "field_b");
$entity_field[0]["value"] = $field_a[0]["value"] + $field_b[0]["value"];

That is the code the description for the Computed Code (PHP) textarea uses as example. (Emphasis is mine.)

The variables available to your code include: &$entity_field, $entity_type, $entity, $field, $instance, $langcode, and $items. To set the value of the field, set $entity_field[0]['value']. For multi-value computed fields continue with $entity_field[1]['value']. Here's a simple example which sets the computed field's value to the value of the sum of the number fields (field_a and field_b) in a node entity:

$field_a = field_get_items($entity_type, $entity, "field_a");
$field_b = field_get_items($entity_type, $entity, "field_b");
$entity_field[0]["value"] = $field_a[0]["value"] + $field_b[0]["value"];

screenshot

I added the fields described in the question to a node. With this code, I get the following output.

screenshot

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