Question: Projector setup

[TerraSkye]

Hi was looking trough the examples and saw stated the folowing. and i wondered why it is that way :

eventhorizon/examples/guestlist/domains/guestlist/projectors.go

Line 184 in 68284b6

if err := p.repo.Save(ctx, g); err != nil {

in here (guestlist projector ) we pass on the repo, and do the saving within the projector

eventhorizon/examples/guestlist/domains/guestlist/projectors.go

Line 99 in 68284b6

return i, nil

in the invitation projector itself. we return the model, and do the saving outside the projecter.
why are these handled differently? and what are the determing factors to use either one.

[maxekman]

In general when there is a one-to-one relationship between an aggregate ID and projected entity ID a projector should be used.

The GuestListProjector is an example of a different kind of projector which is not one-to-one with the event IDs, it uses a fixed ID (for the duration of the test/run) in this case which is used as a statistic collector.

[TerraSkye]

thank you for clarifying, it makes sense now!