```ruby
# frozen_string_literal: true

# To run:
# rake geocode_data:all CLASS=YourModel SLEEP=0.25 BATCH=100

namespace :geocode_data do
  desc 'Geocode all objects without coordinates.'
  task all: :environment do
    class_name = ENV['CLASS'] || ENV['class']
    sleep_timer = ENV['SLEEP'] || ENV['sleep']
    raise 'Please specify a CLASS (model)' unless class_name

    klass = class_from_string(class_name)

    klass.not_geocoded.find_each(batch_size: 100) do |obj|
      obj.geocode
      obj.save
      sleep(sleep_timer.to_f) unless sleep_timer.nil?
    end
  end
end

##
# Get a class object from the string given in the shell environment.
# Similar to ActiveSupport's +constantize+ method.
#
def class_from_string(class_name)
  parts = class_name.split('::')
  constant = Object
  parts.each do |part|
    constant = constant.const_get(part)
  end
  constant
end
```

Add summary default message if summary is blank
user
```ruby
# frozen_string_literal: true

# To run:
# rake geocode_data:all CLASS=YourModel SLEEP=0.25 BATCH=100

namespace :geocode_data do
  desc 'Geocode all objects without coordinates.'
  task all: :environment do
    class_name = ENV['CLASS'] || ENV['class']
    sleep_timer = ENV['SLEEP'] || ENV['sleep']
    raise 'Please specify a CLASS (model)' unless class_name

    klass = class_from_string(class_name)

    klass.not_geocoded.find_each(batch_size: 100) do |obj|
      if obj.respond_to?(:summary) && obj.summary.blank?
        obj.summary = 'Geocoded cases for map display'
      end

      obj.geocode
      obj.save
      sleep(sleep_timer.to_f) unless sleep_timer.nil?
    end
  end
end

##
# Get a class object from the string given in the shell environment.
# Similar to ActiveSupport's +constantize+ method.
#
def class_from_string(class_name)
  parts = class_name.split('::')
  constant = Object
  parts.each do |part|
    constant = constant.const_get(part)
  end
  constant
end
```
assistant