378 lines
19 KiB
Python
378 lines
19 KiB
Python
import os
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from django.core.management.base import BaseCommand
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import requests
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from worldtravel.models import Country, Region, City
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from django.db import transaction
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from tqdm import tqdm
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import ijson
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import gc
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from django.conf import settings
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COUNTRY_REGION_JSON_VERSION = settings.COUNTRY_REGION_JSON_VERSION
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media_root = settings.MEDIA_ROOT
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def saveCountryFlag(country_code):
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# For standards, use the lowercase country_code
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country_code = country_code.lower()
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flags_dir = os.path.join(media_root, 'flags')
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# Check if the flags directory exists, if not, create it
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if not os.path.exists(flags_dir):
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os.makedirs(flags_dir)
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# Check if the flag already exists in the media folder
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flag_path = os.path.join(flags_dir, f'{country_code}.png')
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if os.path.exists(flag_path):
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print(f'Flag for {country_code} already exists')
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return
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res = requests.get(f'https://flagcdn.com/h240/{country_code}.png'.lower())
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if res.status_code == 200:
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with open(flag_path, 'wb') as f:
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f.write(res.content)
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print(f'Flag for {country_code} downloaded')
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else:
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print(f'Error downloading flag for {country_code}')
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class Command(BaseCommand):
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help = 'Imports the world travel data'
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def add_arguments(self, parser):
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parser.add_argument('--force', action='store_true', help='Force download the countries+regions+states.json file')
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def handle(self, **options):
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force = options['force']
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batch_size = 500 # Increased batch size for better performance
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countries_json_path = os.path.join(settings.MEDIA_ROOT, f'countries+regions+states-{COUNTRY_REGION_JSON_VERSION}.json')
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if not os.path.exists(countries_json_path) or force:
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res = requests.get(f'https://raw.githubusercontent.com/dr5hn/countries-states-cities-database/{COUNTRY_REGION_JSON_VERSION}/json/countries%2Bstates%2Bcities.json')
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if res.status_code == 200:
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with open(countries_json_path, 'w') as f:
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f.write(res.text)
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self.stdout.write(self.style.SUCCESS('countries+regions+states.json downloaded successfully'))
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else:
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self.stdout.write(self.style.ERROR('Error downloading countries+regions+states.json'))
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return
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elif not os.path.isfile(countries_json_path):
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self.stdout.write(self.style.ERROR('countries+regions+states.json is not a file'))
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return
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elif os.path.getsize(countries_json_path) == 0:
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self.stdout.write(self.style.ERROR('countries+regions+states.json is empty'))
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return
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elif Country.objects.count() == 0 or Region.objects.count() == 0 or City.objects.count() == 0:
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self.stdout.write(self.style.WARNING('Some region data is missing. Re-importing all data.'))
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else:
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self.stdout.write(self.style.SUCCESS('Latest country, region, and state data already downloaded.'))
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return
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# Use sets for faster lookup instead of dictionaries when we only need existence checks
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self.stdout.write(self.style.SUCCESS('Loading existing data for comparison...'))
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existing_country_codes = set(Country.objects.values_list('country_code', flat=True))
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existing_region_ids = set(Region.objects.values_list('id', flat=True))
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existing_city_ids = set(City.objects.values_list('id', flat=True))
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self.stdout.write(self.style.SUCCESS(f'Found {len(existing_country_codes)} existing countries, {len(existing_region_ids)} regions, {len(existing_city_ids)} cities'))
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# Only fetch full objects when we actually need to update them
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existing_countries = {}
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existing_regions = {}
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existing_cities = {}
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processed_country_codes = set()
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processed_region_ids = set()
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processed_city_ids = set()
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# Process data in streaming fashion to avoid loading everything into memory
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self.stdout.write(self.style.SUCCESS('Starting to process country data...'))
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with open(countries_json_path, 'rb') as f:
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parser = ijson.items(f, 'item')
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countries_to_create = []
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regions_to_create = []
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cities_to_create = []
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countries_to_update = []
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regions_to_update = []
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cities_to_update = []
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country_count = 0
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total_regions_processed = 0
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total_cities_processed = 0
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batch_number = 1
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for country in parser:
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country_count += 1
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country_code = country['iso2']
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country_name = country['name']
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country_subregion = country['subregion']
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country_capital = country['capital']
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longitude = round(float(country['longitude']), 6) if country['longitude'] else None
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latitude = round(float(country['latitude']), 6) if country['latitude'] else None
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if country_count % 10 == 0:
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self.stdout.write(f'Processing country {country_count}: {country_name} ({country_code})')
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processed_country_codes.add(country_code)
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if country_code in existing_country_codes:
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# Only fetch when needed for updates
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if country_code not in existing_countries:
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existing_countries[country_code] = Country.objects.get(country_code=country_code)
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country_obj = existing_countries[country_code]
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country_obj.name = country_name
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country_obj.subregion = country_subregion
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country_obj.capital = country_capital
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country_obj.longitude = longitude
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country_obj.latitude = latitude
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countries_to_update.append(country_obj)
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else:
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country_obj = Country(
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name=country_name,
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country_code=country_code,
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subregion=country_subregion,
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capital=country_capital,
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longitude=longitude,
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latitude=latitude
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)
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countries_to_create.append(country_obj)
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saveCountryFlag(country_code)
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# Process states/regions
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region_count_for_country = 0
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city_count_for_country = 0
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if country['states']:
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for state in country['states']:
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name = state['name']
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state_id = f"{country_code}-{state['state_code']}"
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latitude = round(float(state['latitude']), 6) if state['latitude'] else None
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longitude = round(float(state['longitude']), 6) if state['longitude'] else None
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if state_id in processed_region_ids:
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continue
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processed_region_ids.add(state_id)
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region_count_for_country += 1
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total_regions_processed += 1
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if state_id in existing_region_ids:
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if state_id not in existing_regions:
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existing_regions[state_id] = Region.objects.get(id=state_id)
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region_obj = existing_regions[state_id]
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region_obj.name = name
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region_obj.country = country_obj
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region_obj.longitude = longitude
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region_obj.latitude = latitude
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regions_to_update.append(region_obj)
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else:
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region_obj = Region(
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id=state_id,
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name=name,
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country=country_obj,
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longitude=longitude,
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latitude=latitude
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)
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regions_to_create.append(region_obj)
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# Process cities
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if 'cities' in state and len(state['cities']) > 0:
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for city in state['cities']:
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city_id = f"{state_id}-{city['id']}"
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city_name = city['name']
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latitude = round(float(city['latitude']), 6) if city['latitude'] else None
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longitude = round(float(city['longitude']), 6) if city['longitude'] else None
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if city_id in processed_city_ids:
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continue
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processed_city_ids.add(city_id)
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city_count_for_country += 1
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total_cities_processed += 1
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if city_id in existing_city_ids:
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if city_id not in existing_cities:
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existing_cities[city_id] = City.objects.get(id=city_id)
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city_obj = existing_cities[city_id]
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city_obj.name = city_name
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city_obj.region = region_obj
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city_obj.longitude = longitude
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city_obj.latitude = latitude
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cities_to_update.append(city_obj)
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else:
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city_obj = City(
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id=city_id,
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name=city_name,
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region=region_obj,
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longitude=longitude,
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latitude=latitude
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)
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cities_to_create.append(city_obj)
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else:
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# Country without states - create a default region
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state_id = f"{country_code}-00"
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processed_region_ids.add(state_id)
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region_count_for_country = 1
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total_regions_processed += 1
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if state_id in existing_region_ids:
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if state_id not in existing_regions:
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existing_regions[state_id] = Region.objects.get(id=state_id)
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region_obj = existing_regions[state_id]
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region_obj.name = country_name
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region_obj.country = country_obj
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regions_to_update.append(region_obj)
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else:
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region_obj = Region(
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id=state_id,
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name=country_name,
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country=country_obj
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)
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regions_to_create.append(region_obj)
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if country_count % 10 == 0:
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self.stdout.write(f' └─ {country_name}: {region_count_for_country} regions, {city_count_for_country} cities')
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# Process in batches during iteration to manage memory
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if country_count % 50 == 0: # Process every 50 countries
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self.stdout.write(self.style.WARNING(f'Processing batch {batch_number} (countries {country_count-49}-{country_count})...'))
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self.stdout.write(f' Countries to create: {len(countries_to_create)}, to update: {len(countries_to_update)}')
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self.stdout.write(f' Regions to create: {len(regions_to_create)}, to update: {len(regions_to_update)}')
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self.stdout.write(f' Cities to create: {len(cities_to_create)}, to update: {len(cities_to_update)}')
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self._process_batches(
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countries_to_create, regions_to_create, cities_to_create,
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countries_to_update, regions_to_update, cities_to_update,
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batch_size
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)
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self.stdout.write(self.style.SUCCESS(f'✓ Batch {batch_number} completed successfully'))
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# Clear processed batches and force garbage collection
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countries_to_create.clear()
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regions_to_create.clear()
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cities_to_create.clear()
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countries_to_update.clear()
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regions_to_update.clear()
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cities_to_update.clear()
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# Clear the cached objects to free memory
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existing_countries.clear()
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existing_regions.clear()
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existing_cities.clear()
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gc.collect()
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batch_number += 1
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# Process remaining batches
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if countries_to_create or regions_to_create or cities_to_create or \
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countries_to_update or regions_to_update or cities_to_update:
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self.stdout.write(self.style.WARNING(f'Processing final batch {batch_number} (remaining {len(countries_to_create + countries_to_update)} countries)...'))
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self.stdout.write(f' Countries to create: {len(countries_to_create)}, to update: {len(countries_to_update)}')
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self.stdout.write(f' Regions to create: {len(regions_to_create)}, to update: {len(regions_to_update)}')
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self.stdout.write(f' Cities to create: {len(cities_to_create)}, to update: {len(cities_to_update)}')
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self._process_batches(
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countries_to_create, regions_to_create, cities_to_create,
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countries_to_update, regions_to_update, cities_to_update,
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batch_size
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)
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self.stdout.write(self.style.SUCCESS(f'✓ Final batch completed successfully'))
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self.stdout.write(self.style.SUCCESS(f'Finished processing {country_count} countries, {total_regions_processed} regions, {total_cities_processed} cities'))
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# Clean up obsolete records
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self.stdout.write(self.style.WARNING('Cleaning up obsolete records...'))
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with transaction.atomic():
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countries_deleted = Country.objects.exclude(country_code__in=processed_country_codes).count()
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regions_deleted = Region.objects.exclude(id__in=processed_region_ids).count()
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cities_deleted = City.objects.exclude(id__in=processed_city_ids).count()
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Country.objects.exclude(country_code__in=processed_country_codes).delete()
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Region.objects.exclude(id__in=processed_region_ids).delete()
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City.objects.exclude(id__in=processed_city_ids).delete()
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if countries_deleted > 0 or regions_deleted > 0 or cities_deleted > 0:
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self.stdout.write(f' Deleted {countries_deleted} obsolete countries, {regions_deleted} regions, {cities_deleted} cities')
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else:
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self.stdout.write(' No obsolete records found to delete')
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self.stdout.write(self.style.SUCCESS('All data imported successfully'))
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def _process_batches(self, countries_to_create, regions_to_create, cities_to_create,
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countries_to_update, regions_to_update, cities_to_update, batch_size):
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"""Process all pending batches in a single transaction, safely"""
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with transaction.atomic():
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# 1. Create new countries
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if countries_to_create:
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self.stdout.write(f' Creating {len(countries_to_create)} countries in batches of {batch_size}...')
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for i in range(0, len(countries_to_create), batch_size):
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batch = countries_to_create[i:i + batch_size]
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Country.objects.bulk_create(batch, ignore_conflicts=True)
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# 2. Re-fetch the now-saved countries from the DB
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saved_country_map = {
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c.country_code: c for c in Country.objects.filter(
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country_code__in=[c.country_code for c in countries_to_create]
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)
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}
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# 3. Rebind Region.country to actual saved Country objects
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for region in regions_to_create:
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if isinstance(region.country, Country):
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region.country = saved_country_map.get(region.country.country_code)
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# 4. Create new regions
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if regions_to_create:
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self.stdout.write(f' Creating {len(regions_to_create)} regions in batches of {batch_size}...')
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for i in range(0, len(regions_to_create), batch_size):
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batch = regions_to_create[i:i + batch_size]
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Region.objects.bulk_create(batch, ignore_conflicts=True)
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# 5. Re-fetch the now-saved regions from the DB
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saved_region_map = {
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r.id: r for r in Region.objects.filter(
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id__in=[r.id for r in regions_to_create]
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)
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}
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# 6. Rebind City.region to actual saved Region objects
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for city in cities_to_create:
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if isinstance(city.region, Region):
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city.region = saved_region_map.get(city.region.id)
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# 7. Create new cities
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if cities_to_create:
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self.stdout.write(f' Creating {len(cities_to_create)} cities in batches of {batch_size}...')
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for i in range(0, len(cities_to_create), batch_size):
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batch = cities_to_create[i:i + batch_size]
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City.objects.bulk_create(batch, ignore_conflicts=True)
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# 8. Update existing countries
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if countries_to_update:
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self.stdout.write(f' Updating {len(countries_to_update)} countries in batches of {batch_size}...')
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for i in range(0, len(countries_to_update), batch_size):
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batch = countries_to_update[i:i + batch_size]
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Country.objects.bulk_update(batch, ['name', 'subregion', 'capital', 'longitude', 'latitude'])
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# 9. Update existing regions
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if regions_to_update:
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self.stdout.write(f' Updating {len(regions_to_update)} regions in batches of {batch_size}...')
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for i in range(0, len(regions_to_update), batch_size):
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batch = regions_to_update[i:i + batch_size]
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Region.objects.bulk_update(batch, ['name', 'country', 'longitude', 'latitude'])
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# 10. Update existing cities
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if cities_to_update:
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self.stdout.write(f' Updating {len(cities_to_update)} cities in batches of {batch_size}...')
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for i in range(0, len(cities_to_update), batch_size):
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batch = cities_to_update[i:i + batch_size]
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City.objects.bulk_update(batch, ['name', 'region', 'longitude', 'latitude'])
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