Add ability to iterate over items registered in a namespace

[dry-rb]

Add ability to iterate over items registered in a namespace

[solnic]

We already have features that are not available in plain Hash API and I don't think it was ever a requirement that Container must be replaceable by a plain Hash.

[timriley]

This feature seems like the kind of generic functionality that would fit just fine in dry-container.

After all, dry-container already supports the idea of "namespaces" when it comes to registering entries, and we can already hack together a namespaced iteration like @paul demonstrates, so I think it'd be good to have in place here.

[davydovanton]

hey, I think it's a good idea and this functionality can be useful in other projects/gems. But I'm not sure that should we really add it to dry-container. @solnic @timriley WDYT folks?

[solnic]

But I'm not sure that should we really add it to dry-container.

@davydovanton why?

[davydovanton]

@solnic I think it can be useful in business logic more (just IMHO) and I'm not sure that it's a good idea to make dry-container more complex. Also, I see one good example of usage of this functionality in hanami (like use internal container Container['hanami.core'] or something like this, but in hanami we use dry-system). That's why I think it will be a good idea to implement it in dry-system's container. But it will be ok for me to implement it in dry-container too. I just want to say that I see it as a dry-system feature more.

[solnic]

I agree, this should be implemented here.

[flash-gordon]

The potential problem is if some API depends on this feature you won't be able to swap the container with a plain hash or something else.

[timriley]

True, but I think that's something we can live with.