application.hbs

<form {{action "updateAdressQuery" on="submit"}}>
  <p>
    <label>Address Query for Bound Marker</label>
    {{input value=addressQueryInput}}
  </p>
  <p>
    <button type="submit"> Update bound marker </button>
  </p>
    <button {{action "pullMongoDBData"}}> Pull MongoDB Data </button>
  </p>
</form>

{{#g-map markersFitMode="live" options=customOptions as |context|}}
  {{#each city in locArray}}
    {{g-map-marker context lat=48.856614 lng=2.3522219}}
  {{/each}}
{{/g-map}}