Syntax Error with $: notation

General Q&A
1

What is the correct syntax for displaying a field on a belongs-to relationship using $: notation. The following is not working for me:

{$:displayFormatted($object.rel_1.name)}

where rel_1 is a belongs-to on $object.

2

Once you use $: notation you are executing raw JS, and in JS the parent relationship is a method and requires parentheses.

So the syntax would be {$:displayFormatted($object.rel_1().name)} or which ever field you want to show.

In the XML you can use the relationship name without the parentheses