passing data from domain class to chart (map)

I created a domain class and can pass the data to the view, but I cannot get the chart to read that passed data.. Perhaps I am not approaching this the correct way.. could someone add this to usage?

Error I get: Unclosed GSP expression

class ThingLocController {
def map (){
def places= ThingLoc.list()
[places: places]
}

The GSP:

(...)

[${place.lat}, ${place.lon}, "${place.name }"],/g:each] }"
(...)

Start with the ThingLocController map action and the GSP containing the gvisualization:map tag, then reproduce the reported “Unclosed GSP expression” error with the places data. Determine the supported usage pattern and document a working example for passing domain-class data to the map chart.

Written by the indexing model from the issue text.