Making Computed Field work with Flexifield

Many people have stated that Computed Field will not work with Flexifield.

This example shows how to make it work and get a sum of multiple values from a Flexifield's sub-field.
Assuming 'field_my_flexi' is your Flexifield name, and that you have it set to allow multiple entries; and that you have a sub-field called 'field_flexi_price', and you want to get the sum of all prices for that Flexifield...

Computed Code:

$value1 = $node->field_my_flexi[0]['value']['field_flexi_price'][0]['value'];
$value2 = $node->field_my_flexi[1]['value']['field_flexi_price'][0]['value'];
$value3 = $node->field_my_flexi[2]['value']['field_flexi_price'][0]['value'];
$value4 = $node->field_my_flexi[3]['value']['field_flexi_price'][0]['value'];
$node_field[0]['value'] = $value1 + $value2 + $value3 + $value4;

Display Format:

$display = $node_field_item['value'];

Data Type: varchar
Date Length: 5