I have various chunks of reference data, say a tree or a list of _all_ (i.e. 
active and historical) entities. I then have various subscriptions which refine 
that view, for example:
 - only active 
 - only active but including a given id

In the handler I sometimes need access to this data, but according to the 
re-frame doc:

"Rules:

components never source data directly from app-db, and instead, they use a 
subscription.
subscriptions are only ever used by components (they are never used in, say, 
event handlers)."

I can work around this - the subscription code typically delegates to a 'plain' 
defn so I can retrieve the data from the db and call the same defn, but 
sometimes that jars a bit.

The fact it is useful for me to do something not only discouraged but actively 
against the rules makes me question my design somewhat; what is the rationale 
for not allowing an event handler to view a subscription? Am I wrong in viewing 
a subscription as merely a view on the data in which case I don't see the 
danger...

I get that components should be divorced from the structure of the DB and event 
handlers necessarily need to know the structure but I see a subscriptions as 
more than just structure - it sometimes applies transformations that I would 
want to re-use.

Thanks!

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