Serialize GeoJson using active_model_serializer and geojson_model

serialize_geo_json.txt

# Serialize GeoJson using active_model_serializer and geojson_model

## gems
gem 'geojson_model'
gem 'active_model_serializer'

## Concern
module <Model>::GeoJsonable
  extend ActiveSupport::Concern

  module ClassMethods
    def to_geo_json(serializer:)
      features = where(nil).map do |v|
        properties = serializer.new(v)
        coordinates = [v.geo_location.longitude.to_f, v.geo_location.latitude.to_f]
        geometry = GeojsonModel::Geometry.new(type: 'Point', coordinates:)

        GeojsonModel::Feature.new(properties:, geometry:)
      end

      GeojsonModel::FeatureCollection.new(features:)
    end
  end
end

## Model
class Model < Application Record
  ...
  include GeoJsonable
  ...
end

## Controller
def index
  records = Model.all

  respond_to do |format|
    format.geojson { render json: records.to_geo_json(serializer: MySerializer) }
    format.json { render json: records, each_serializer: MySerializer }
  end
end