Passing in page object selectors to a page object command

[Topperfalkon]

Possibly having a bit of a brainfart, but the docs don't really explain, or at least haven't helped me understand, how you can use page object selectors as an input to a page command.

I'm using Nightwatch 1.7.x and I'm building up a page object to manage interaction with a map page, and due to general Google Maps nonsense I need to carry out an API command to move to an element (a map pin) and force a click on it, to bypass Selenium/Webdriver's interactibility logic.

So my command looks like this

var mapCommands = {
    clickMap: function(element) {
        return this.api.moveToElement(element, 0, 0).mouseButtonClick()
    }
}

(it's then referenced in the exported object)

...
commands: [mapCommands],
...

And I'm accessing it in the test using something like mapPage.clickMap('@mapMarker') (where mapPage is the initialised page object, and @mapmarker is the reference to the selector in that page object). When I run this command I get an error that the selector is invalid. Am I doing something stupid?