def test_nested_references(historian: mincepy.Historian):
car = Car()
garage = Garage(car)
car_id = historian.save(car)
garage_id = historian.save(garage)
# Now change the car
car.make = 'fiat'
car.colour = 'white'
historian.save(car)
# Try loading while the object is still alive
loaded_garage = historian.load(garage_id)
assert loaded_garage is garage
# Now delete and load
del garage
del car
loaded_garage2 = historian.load(garage_id)
# Should be the last version fo the car
assert loaded_garage2.car.make == 'fiat'
assert len(historian.history(car_id)) == 2
# The following may seem counter intuitive that we only have one history
# entry for garage. But above we only saved it once. It's just that when
# we load the garage again we get the 'latest' version it's contents i.e.
# the newer version of the car
assert len(historian.history(garage_id)) == 1
def test_metadata_using_object_instance(historian: mincepy.Historian):
car = Car()
historian.save((car, {'reg': 'VD395'}))
# Check that we get back what we just set
assert historian.meta.get(car) == {'reg': 'VD395'}
car.make = 'fiat'
historian.save(car)
# Check that the metadata is shared
assert historian.meta.get(car) == {'reg': 'VD395'}
historian.meta.set(car, {'reg': 'N317'})
assert historian.meta.get(car) == {'reg': 'N317'}
def test_get_latest(historian: mincepy.Historian):
# Save the car
car = Car()
car_id = historian.save(car)
# Change it and save getting a snapshot
car.make = 'fiat'
car.colour = 'white'
historian.save(car)
fiat_sid = historian.get_snapshot_id(car)
assert car_id != fiat_sid
# Change it again...
car.make = 'honda'
car.colour = 'wine red'
historian.save(car)
honda_sid = historian.get_snapshot_id(car)
assert honda_sid != fiat_sid
assert honda_sid != car_id
# Now delete and reload
del car
latest = historian.load(car_id)
assert latest == historian.load_snapshot(honda_sid)
def test_metadata_simple(historian: mincepy.Historian):
car = Car()
ferrari_id = historian.save((car, {'reg': 'VD395'}))
# Check that we get back what we just set
assert historian.meta.get(ferrari_id) == {'reg': 'VD395'}
car.make = 'fiat'
red_fiat_id = historian.save(car)
# Check that the metadata is shared
assert historian.meta.get(red_fiat_id) == {'reg': 'VD395'}
historian.meta.set(ferrari_id, {'reg': 'N317'})
# Check that this saves the metadata on the object level i.e. both are changed
assert historian.meta.get(ferrari_id) == {'reg': 'N317'}
assert historian.meta.get(red_fiat_id) == {'reg': 'N317'}
def test_save_snapshot_change_load(historian: mincepy.Historian):
car = Car()
# Saving twice without changing should produce the same snapshot id
historian.save(car)
ferrari_sid = historian.get_snapshot_id(car)
historian.save(car)
assert ferrari_sid == historian.get_snapshot_id(car)
car.make = 'fiat'
car.color = 'white'
historian.save(car)
fiat_sid = historian.get_snapshot_id(car)
assert fiat_sid != ferrari_sid
ferrari = historian.load_snapshot(ferrari_sid)
assert ferrari.make == 'ferrari'
assert ferrari.colour == 'red'