I'm attempting to rewrite our validation using spec and am running into some
trouble with naming of nested entities.
Our system processes bills, and we require different fields depending on the
context. So, for instance, in data-entry-form-1 say we require
```
(s/def :form/data-entry-form-1
(s/keys :req [:bill/account
:bill/carrier
:freight-bill/billed-charges]))
```
where :freight-bill/billed-charges is a nested entity,
```
(s/def :freight-bill/billed-charges
(s/keys :req [:charge-group/total-charges]))
```
The complication is that billed charges has a different set of required keys on
data-entry-form-2,
```
(s/def :freight-bill/billed-charges
(s/keys :req [:charge-group/total-charges
:charge-group/total-pieces]))
```
It's easy enough to create a specification per form, each with a different set
of required keys. It seems unreasonable, however, to create a new spec per
form per nested entity. Not only would the number of specs grow quickly, but it
seems strange to create name variations for the same entity, e.g.
`:de1.freight-bill/billed-charges`.
I see two solutions as things stand. One approach is to specify everything with
optional keys, and create separate code for checking required fields. Another
is to use multispecs, however this approach becomes too complex for my taste,
as it would require walking nested entities to decorate them with a dispatch
key like {:type :data-entry-1-form ...} etc.
Ideally, we would be able to specify keys and required key paths separately.
-Tyler
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