Question

I have a map which has got marker based on state of US. Each state has n number of city.

I have got a state model, controller and city model, controller.

When I click on the marker of the state, I want the list of cities to be displayed in the info window.

All this information is appearing on the homepage.

This is what I have done so far :-

home_controller.rb

def index
    @states = State.all.to_gmaps4rails do |state,marker|
        marker.infowindow render_to_string(:partial => "/states/gmaps4rails_infowindow", :locals => {:object => state})
        marker.json({:id => state.id})
    end
end

home/index.html.haml

=gmaps({"map_options" =>{ "auto_zoom" => false, "zoom" => 3}, "markers" => { "data" => @states } })

state_controller.rb

def gmaps4rails_infowindow
  @state = Gmaps.map.markers
end

states/_gmaps4rails_infowindow.html.haml

=@state.cities.each do |city|
    =city.name

Needless to say that it is not working. Can someone please help me out?

Answer 1

Well, your home_controller.rb is fine. you write here you want to use a partial with a local variable named object.

In the partial itself, you write:

=@state.cities.each do |city|
  =city.name

The instance variable isn’t defined there, you defined a local variable just above.

Replace with:

=object.cities.each do |city|
  =city.name

From there it should work.

---

Notice:

def gmaps4rails_infowindow
  @state = Gmaps.map.markers 
end

is:

• useless: you define the infowindow in the controller

• wrong: Gmaps.map.markers only lives as js variable