问ActionController::UnknownFormat错误

EN

function my_function()
{
    swal("Place is not saved in google maps!", "Please move the marker to the desired location and add its name");
}

def create
        #Checks if the current user have this favorite place already ,it renders Favorite Place already exists
        if current_user.favorite_places.include?(FavoritePlace.find_by(:name => favorite_place_params[:name]))
          id=FavoritePlace.find_by(:name => favorite_place_params[:name]).id
          redirect_to favorite_places_path , notice: 'Favorite place already exists'
        else
         #Checks if the favorite Place exists in the database it finds the place puts it in the variable favorite place
          if FavoritePlace.exists?(:name => favorite_place_params[:name])
            @favorite_place = FavoritePlace.find_by(:name => favorite_place_params[:name])
         #Or it  will create a new one with the allowed parameters only.  
          else
            @favorite_place = FavoritePlace.new(favorite_place_params)
            @favorite_place.save
          end
          id=@favorite_place.id
          #It assigns the favorite place to the user.
          UserFavoritePlace.add_favorite_place(current_user,@favorite_place) 
          redirect_to favorite_places_path , notice: 'Favorite place was successfully added.'
          respond_to do |format|
            format.js { render :js => "my_function();" }
          end
        end
      end