Comments (1)
lukaszb
commented on August 15, 2024
So actually we can simplify the problem with events replay to: when running a replay we want to re-build projections only and ignore any other side-effects.
Requirements
To achieve this, we would need to
- somehow recognise that a handler is run in a "replay" mode
- ignore side effects
Implementation sample
from cq.handlers import register_handler
from cq.handlers import side_effect
@register_handler('User', 'Registered')
def handle_user_registered(event):
UserProjection.objects.create(id=event.aggregate_id, email=event.data['email'])
with side_effect:
send_activation_email(email=event.data['email'])from cq.
Related Issues (18)
- Implement first set of APIs by writing example Django app HOT 1
- Remove metaclass usage HOT 1
- Rename entity/aggregate HOT 1
- Implement local memory storage HOT 1
- mutators should accept events
- commands should be atomic
- Add snapshots
- Add README with initial documentation HOT 1
- Expose better API for querying events
- Aggregate type is required when querying for events
- Upcasting - events versioning
- Add Makefile and tox config so we can run tests HOT 1
- Connect with travis-CI HOT 1
- Add Licensing Information
- Implement SQLAlchemy storage
- Write example sqlalchemy based app
- Abstract away events HOT 1
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from cq.