Compares two models

In this example we show how to use polaris testing capabilities for comparing two different networks

import shutil
from pathlib import Path

from polaris import Polaris
from polaris.utils.testing.model_comparison.compare_databases import compare_databases


# Let's copy the model we have available for testing
model_path1 = Path("/tmp/Grid")
model_path2 = Path("/tmp/Grid_model_comparison")
if model_path2.exists():
    shutil.rmtree(model_path2)
shutil.copytree("/tmp/Grid", "/tmp/Grid_model_comparison")

project1 = Polaris.from_dir(model_path1)
project2 = Polaris.from_dir(model_path2)

We can compare two identical supply files We must provide the path to the supply databases

report = compare_databases(project1.supply_file, project2.supply_file)

for record in report:
    print(record)

**No dropped tables**

**No new tables**

**Tables with no changes**:

about_model, area_type, connection, county_skims, editing_table, electricity_grid_transmission, electricity_provider, electricity_provider_pricing, ev_charging_station_plug_types, ev_charging_station_plugs, ev_charging_station_pricing, ev_charging_station_service_bays, ev_charging_stations, land_use, link, link_overrides, link_type, location, location_links, location_parking, micromobility_agencies, micromobility_docks, micromobility_operators, migrations, node, parking, phasing, phasing_nested_records, pocket, road_connectors, roadsideunit, sanity_check, settings, sign, signal, signal_nested_records, timing, timing_nested_records, toll_pricing, traffic_incident, transit_agencies, transit_bike, transit_fare_attributes, transit_fare_rules, transit_links, transit_modes, transit_pattern_links, transit_pattern_mapping, transit_patterns, transit_routes, transit_stops, transit_trips, transit_trips_schedule, transit_walk, transit_zones, turn_overrides, use_code, zone

Or we can do something drastic like remove all transit data and then compare them

project2.network.transit.purge()

report = compare_databases(project1.supply_file, project2.supply_file)

for record in report:
    print(record)

project1.close()
project2.close()

**No dropped tables**

**No new tables**

**Tables with no changes**:

about_model, area_type, connection, county_skims, electricity_grid_transmission, electricity_provider, electricity_provider_pricing, ev_charging_station_plug_types, ev_charging_station_plugs, ev_charging_station_pricing, ev_charging_station_service_bays, ev_charging_stations, land_use, link, link_overrides, link_type, location, location_links, location_parking, micromobility_agencies, micromobility_docks, micromobility_operators, migrations, node, parking, phasing, phasing_nested_records, pocket, road_connectors, roadsideunit, sanity_check, settings, sign, signal, signal_nested_records, timing, timing_nested_records, toll_pricing, traffic_incident, transit_modes, transit_pattern_mapping, turn_overrides, use_code, zone



**Tables with changes**:

editing_table:

     * 954 records added to table

transit_agencies:

     * 6 records deleted from table

transit_bike:

     * 477 records deleted from table

transit_fare_attributes:

     * 6 records deleted from table

transit_fare_rules:

     * 18 records deleted from table

transit_links:

     * 44 records deleted from table

transit_pattern_links:

     * 44 records deleted from table

transit_patterns:

     * 13 records deleted from table

transit_routes:

     * 5 records deleted from table

transit_stops:

     * 34 records deleted from table

transit_trips:

     * 3,731 records deleted from table

transit_trips_schedule:

     * 16,359 records deleted from table

transit_walk:

     * 477 records deleted from table

transit_zones:

     * 6 records deleted from table