```ruby
require 'dashboard'

class AggregateSchoolService
  def initialize(active_record_school)
    @active_record_school = active_record_school
  end

  def aggregate_school
    Rails.cache.fetch(cache_key, expires_in: 1.day) do
      meter_collection = Amr::AnalyticsValidatedMeterCollectionFactory.new(@active_record_school).build

      AggregateDataService.new(meter_collection).validate_and_aggregate_meter_data

      meter_collection
    end
  end

  def invalidate_cache
    Rails.cache.delete(cache_key)
  end

  def in_cache?
    Rails.cache.exist?(cache_key)
  end

  def in_cache_or_cache_off?
    in_cache? || self.class.caching_off?
  end

  def self.caching_off?
    ! Rails.application.config.action_controller.perform_caching
  end

  def self.analysis_date(meter_collection, fuel_type)
    fuel_type = fuel_type.to_sym
    if fuel_type == :gas
      meter_collection.aggregated_heat_meters.amr_data.keys.last
    elsif fuel_type == :electricity
      meter_collection.aggregated_electricity_meters.amr_data.keys.last
    else
      Time.zone.today
    end
  end

private

  def cache_key
    "#{@active_record_school.id}-#{@active_record_school.name.parameterize}-aggregated_meter_collection-#{@active_record_school.validation_cache_key}"
  end
end
```

Update not to validate twice
user
```ruby
require 'dashboard'

class AggregateSchoolService
  def initialize(active_record_school)
    @active_record_school = active_record_school
  end

  def aggregate_school
    Rails.cache.fetch(cache_key, expires_in: 1.day) do
      meter_collection = Amr::AnalyticsValidatedMeterCollectionFactory.new(@active_record_school).build

      AggregateDataService.new(meter_collection).aggregate_heat_and_electricity_meters

      meter_collection
    end
  end

  def invalidate_cache
    Rails.cache.delete(cache_key)
  end

  def in_cache?
    Rails.cache.exist?(cache_key)
  end

  def in_cache_or_cache_off?
    in_cache? || self.class.caching_off?
  end

  def self.caching_off?
    ! Rails.application.config.action_controller.perform_caching
  end

  def self.analysis_date(meter_collection, fuel_type)
    fuel_type = fuel_type.to_sym
    if fuel_type == :gas
      meter_collection.aggregated_heat_meters.amr_data.keys.last
    elsif fuel_type == :electricity
      meter_collection.aggregated_electricity_meters.amr_data.keys.last
    else
      Time.zone.today
    end
  end

private

  def cache_key
    "#{@active_record_school.id}-#{@active_record_school.name.parameterize}-aggregated_meter_collection-#{@active_record_school.validation_cache_key}"
  end
end
```
assistant