def calculate_total_RainIrrigation(crop_season,
field,
date,
water_history_query):
"""
Calculate total rain/irrigations. Values are added over all records
for that day. Two queries are required, since rain/irrigation can now
come from the probe readings as well. Calculate min/max temps for the
day as well.
"""
if isinstance(date, datetime):
date = date.date()
rainfall = Decimal(0.0)
irrigation = Decimal(0.0)
min_temp = None
max_temp = None
# Now add the values coming from the water history (soon to be renamed manual reading)
wh_list = water_history_query.filter(datetime__range=d2dt_range(date)).all()
if wh_list:
rainfall = rainfall + sum( map( lambda wh: wh.rain if wh.rain else 0, wh_list ) )
irrigation = irrigation + sum( map( lambda wh: wh.irrigation if wh.irrigation else 0, wh_list) )
min_temp = minNone(min_temp, minNone(*map( lambda wh: wh.min_temp_24_hours, wh_list)))
max_temp = max(max_temp, max(map( lambda wh: wh.max_temp_24_hours, wh_list)))
## Really need min_temp?
#if DEBUG: print "Min temp, max temp for: ", date, min_temp, max_temp
return ( rainfall, irrigation, min_temp, max_temp )
def earliest_register_to_update(report_date,
crop_season,
field):
# Start by getting the dependency modification date stored in the field object
dependency_mdate = field.earliest_changed_dependency_date
## if DEBUG: print "Crop Season %s, Field %s, Earliest changed date %s" % (crop_season, field, dependency_mdate)
# Get the modification time of the latest water register
latest_water_register = WaterRegister.objects.filter(crop_season=crop_season,
field=field
).order_by('-datetime').first()
if latest_water_register is None:
##if DEBUG: print 'No water register yet'
return crop_season.season_start_date
#if DEBUG: print 'Date of latest wr: ', latest_water_register.datetime.date()
# Get the earliest water history that has been modified after the latest
# water register has been modified
earliest_wh_update = WaterHistory.objects.filter(crop_season=crop_season,
field=field).filter(
Q(mdate__gte = latest_water_register.mdate)).order_by('datetime').first()
earliest_to_update = latest_water_register.datetime.date() + timedelta(days=1)
if earliest_wh_update is None:
# if DEBUG: print 'No WH will cause update to water register'
pass
else:
earliest_to_update = earliest_wh_update.datetime.date()
# if DEBUG: print "Caclulated dependency dates:"
# if DEBUG: print "field.earliest_changed_dependency_date:", dependency_mdate
# if DEBUG: print "earliest changed water history:", earliest_to_update
# if DEBUG: print "latest_water_register.date + 1:", latest_water_register.datetime.date() + timedelta(1)
retval = minNone(dependency_mdate, earliest_to_update,
latest_water_register.datetime.date() + timedelta(1))
if DEBUG: print "Returning earliest_date: %s" % retval
return retval
