def to_event_message(cls, event: BaseEvent) -> Message:
# FIXME Should one of `aggregate_cls` or `stream_name` be mandatory?
if not (event.meta_.aggregate_cls or event.meta_.stream_name):
raise IncorrectUsageError({
"_entity": [
f"Event `{event.__class__.__name__}` needs to be associated with an aggregate or a stream"
]
})
if has_id_field(event):
identifier = getattr(event, id_field(event).field_name)
else:
identifier = str(uuid4())
# Use explicit stream name if provided, or fallback on Aggregate's stream name
stream_name = (event.meta_.stream_name
or event.meta_.aggregate_cls.meta_.stream_name)
return cls(
stream_name=f"{stream_name}-{identifier}",
type=fully_qualified_name(event.__class__),
data=event.to_dict(),
metadata=MessageMetadata(
kind=MessageType.EVENT.value,
owner=current_domain.domain_name,
**cls.derived_metadata(MessageType.EVENT.value),
)
# schema_version=command.meta_.version, # FIXME Maintain version for event
)
def to_command_message(cls, command: BaseCommand) -> Message:
# FIXME Should one of `aggregate_cls` or `stream_name` be mandatory?
if not (command.meta_.aggregate_cls or command.meta_.stream_name):
raise IncorrectUsageError({
"_entity": [
f"Command `{command.__class__.__name__}` needs to be associated with an aggregate or a stream"
]
})
# Use the value of an identifier field if specified, or generate a new uuid
if has_id_field(command):
identifier = getattr(command, id_field(command).field_name)
else:
identifier = str(uuid4())
# Use explicit stream name if provided, or fallback on Aggregate's stream name
stream_name = (command.meta_.stream_name
or command.meta_.aggregate_cls.meta_.stream_name)
return cls(
stream_name=f"{stream_name}:command-{identifier}",
type=fully_qualified_name(command.__class__),
data=command.to_dict(),
metadata=MessageMetadata(
kind=MessageType.COMMAND.value,
owner=current_domain.domain_name,
**cls.derived_metadata(MessageType.COMMAND.value),
)
# schema_version=command.meta_.version, # FIXME Maintain version for command
)
def test_id_field_for_command_with_identifier():
assert has_id_field(Registered) is True
field = id_field(Registered)
assert field is not None
assert field.field_name == "user_id"
def test_id_field_for_command_without_identifier():
assert has_id_field(EmailSent) is False
def test_elements_with_optional_id_field():
assert has_id_field(CommandWithId) is True
assert has_id_field(CommandWithoutId) is False
def test_elements_with_no_id_fields():
assert has_id_field(ApplicationService1) is False
def test_elements_with_id_fields():
assert has_id_field(Entity1) is True
assert has_id_field(Aggregate1) is True