Getting the data for the Map

ontario_controller.rb

# frozen_string_literal: true

class OntarioController < ApplicationController
  protect_from_forgery except: :map_data

  def map_data
    @patients = PatientDatum.where(region: 'ON').group(:reporter, :reporter_latitude, :reporter_longitude, :reporter_website).count
    @patient_map = @patients.keys.map do |key|
      {
        'type': 'Feature',
        "geometry": {
          "type": 'Point',
          "coordinates": [
            key[2],
            key[1]
          ]
        },
        "properties": {
          'reporter': key[0],
          'num_cases': @patients[key],
          'website': key[3]
        }
      }
    end

    result_string = "eqfeed_callback({ 'type': 'FeatureCollection', 'features': #{@patient_map.to_json} });"

    respond_to do |format|
      format.js { render json: result_string }
    end
  end
end