Production.transaction do
        Inverter.cache do
          params[:productions]['production'].each do |prod|
            @ids << Production.find_or_create_by_record_timestamp_and_inverter_id(
                :record_timestamp => prod['record_timestamp'],
                :inverter_id => Inverter.find_by_serial(prod['inverter']).id,
                :kwh_total => prod['kwh_total'],
                :irradiance => prod['irradiance'],
                :ambient_temp => prod['ambient_temp']
            ).id
          end
        end
      end

# Example Use and SQL Queries generated by ActiveRecord:

# m = {"record_timestamp"=>"09/27/2010 22:26:49", "inverter"=>"2001073445", "kwh_total"=>"-1000", "irradiance"=>"0"}

# Production.find_or_create_by_record_timestamp_and_inverter_id(
#   :record_timestamp => m['record_timestamp'],
#   :inverter_id => Inverter.find_by_serial(m['inverter']).id,
#   :kwh_total => m['kwh_total'],
#   :irradiance => m['irradiance']
# )


# Production Load (19.3ms)  SELECT "productions".* FROM "productions" WHERE "productions"."record_timestamp" = '09/27/2010 22:26:49' AND "productions"."inverter_id" = 13 LIMIT 1

# AREL (21.2ms)  INSERT INTO "productions" ("inverter_id", "created_at", "updated_at", "kwh_total", "irradiance", "record_timestamp", "ambient_temp") VALUES (13, '2011-03-11 17:31:12.454028', '2011-03-11 17:31:12.454028', -1000.0, 0.0, NULL, NULL)