Use Condition in Computed Field with Field Collections

Question

I have an entity with a field colleciton (fc_details), and in that field collection I have fields amount(field_amount) and Type (field_type)

There are several examples to sum up field colleciton values in computed field like:

$sum = 0;
$wrapper = entity_metadata_wrapper($entity_type, $entity);
  foreach($wrapper->field_fc_details as $collection) {
    $sum += $collection->field_amount->value();
  }

$entity_field[0]['value'] = $sum; 

But I want to sum up values, where field_type values = "Z".

I tried variations of "if($wrapper->field_type->value()='Z' " inside foreach, but then site gives 500 error.

Any ideas ? Thanks in advance.

Answer 1

Try the following and let me know how you go.

if($collection->field_type->value() == 'Z') {
  $sum += $collection->field_amount->value();
}

Answer 2

OK, I solved the problem by this way: When I try to fetch the value inside the if condition, it throws 500 error. So I first assigned a variable to the control value and used it in if condition, it worked.

$sum = 0;
$wrapper = entity_metadata_wrapper($entity_type, $entity);
  foreach($wrapper->field_fc_details as $collection) {
   $type = $collection->field_type->value();
   if ($type == 'Z'){  
    $sum += $collection->field_amount->value();
   }
  }
$entity_field[0]['value'] = $sum; 

Still couldn't get the reason, but it works.