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from django.core.exceptions import FieldFetchBlocked
class FetchMode:
__slots__ = ()
track_peers = False
def fetch(self, fetcher, instance):
raise NotImplementedError("Subclasses must implement this method.")
class FetchOne(FetchMode):
__slots__ = ()
def fetch(self, fetcher, instance):
fetcher.fetch_one(instance)
def __reduce__(self):
return "FETCH_ONE"
FETCH_ONE = FetchOne()
class FetchPeers(FetchMode):
__slots__ = ()
track_peers = True
def fetch(self, fetcher, instance):
instances = [
peer
for peer_weakref in instance._state.peers
if (peer := peer_weakref()) is not None
]
if len(instances) > 1:
fetcher.fetch_many(instances)
else:
fetcher.fetch_one(instance)
def __reduce__(self):
return "FETCH_PEERS"
FETCH_PEERS = FetchPeers()
class Raise(FetchMode):
__slots__ = ()
def fetch(self, fetcher, instance):
klass = instance.__class__.__qualname__
field_name = fetcher.field.name
raise FieldFetchBlocked(f"Fetching of {klass}.{field_name} blocked.") from None
def __reduce__(self):
return "RAISE"
RAISE = Raise()
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