How use resource.get_text_metrics? [SOLVED]

Questions
1

from official doc:

function init(self)
    local font = go.get("#label", "font")
    local metrics = resource.get_text_metrics(font, "The quick brown fox\n jumps over the lazy dog")
    pprint(metrics)
end

but i don’t use game object, if i try following:

    local font = gui.get_font(self.text)
	pprint(resource.get_text_metrics(font, "text"))

it gives error:

ERROR:EVENTCM: gui/templates/banner.lua:19: Could not get fontc type resource: sofia
2

found

function init(self)
  local node = gui.get_node("name")
  local font_name = gui.get_font(node)
  local font = gui.get_font_resource(font_name)
  local metrics = resource.get_text_metrics(font, "The quick brown fox\n jumps over the lazy dog")
end
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