This is probably not clojure specific, but it’s a problem for which i’ve
never really found a satisfying in other languages. Maybe clojure has a
better opinion on the matter?
How does one evolve/change data (entities) in a system over time without
also having to change every piece that touches that data?
e.g. if I had an entity “foo”:
{:a 'a
:b 'b
:c {:d 'd}}
and I wrote a nice `clojure.spec` for that foo entity, and maybe formalized
it into a record, anything that needed the data could read straight from
built in functions:
(get/get-in/... keyword)
I could move one step more formal and write “accessors” for compound data,
i.e.
(defn get-a-compound [foo] (str (:a foo) (:b foo) (get-in foo [:c :d])
Now at some point I have to change my entity because a business requirement
changed, or the domain model wasn’t correct the first time. Must now
everything that touches foo and follows the clojure.spec "contract" of the
data shape change?
What’s the idiomatic clojure way to handle this? Is it a solved problem, or
is this just a reality that everyone must suffer?
Do I write "getters" for every little piece and lose the :keyword function
accessibility? This seems like data hiding, and smells bad.
Do I leave the raw data alone, and write compound getters? How do protocols
fit into this?
In short: how does one prevent the shape of the data from bleeding into the
system such that you can evolve your data over time?
Any opinions, references, or discussion would be much appreciated.
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