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I have a field collection on a custom content type and I'd like to add up the values of all the instances of one field within the field collection. The normal way to reference fields doesn't seem to work when they're in a collection.
For instance, say I had a "widget" field collection (field_widget) with two fields - widget name (field_wname) and widget quantity (field_wquantity).
How would I reference the widget quantity field in my computed field php in order to add up all the quantities of widgets to get a total number of all types of widgets?