Hi,
I am wiring up a bunch of CRUD command handlers for different aggregates
using prismatic schema to validate and it is screaming out for a macro, but
my ignorance is screaming even louder :).
The form I want to emit is something like (for a 'Location' for example):
(s/defn ^:always-validate create :- [events/LocationDefinedSchema]
[detail :- (-> commands/DefineLocationSchema :detail)]
(let [ar (common/new-ar detail)
event (events/event :location-defined ar)]
[event]))
Where 'events/LocationDefinedSchema' and 'commands/DefineLocationSchema'
are prismatic schemas.
To make it generic (and relying on convention) then once I have the
aggregate I can do:
(def aggregate :location)
(def DefineCommandSchema (symbol (str "my.domain.commands/Define"
(clojure.string/capitalize (name aggregate)) "Schema")))
(def DefinedEventSchema (symbol (str "my.domain.events/"
(clojure.string/capitalize (name aggregate)) "DefinedSchema")))
(def defined-event-key (keyword (str (name aggregate) "-defined")))
(def define-command-key (keyword (str "define-" (name aggregate))))
which allows the generic create form to be:
(s/defn ^:always-validate create :- [DefinedEventSchema]
[detail :- (-> DefineCommandSchema :detail)]
(let [ar (common/new-ar detail)
event (events/event defined-event-key ar)]
[event]))
I then tried to extract this into a macro:
(defmacro create-infrastructure
[aggregate]
(let [{:keys [define-command-schema
defined-event-schema
define-command-key
defined-event-key]} (default-options aggregate)]
`(do
(schema.core/defn ^:always-validate create :-
[~defined-event-schema]
[detail# :- (:detail ~define-command-schema)]
(let [ar# (common/new-ar detail#)
event# (events/event ~defined-event-key ar#)]
[event#])))
))
Where 'default-options' just returns a map with the specified keys and
constructs some symbols.
Unfortunately the emitted form is:
(macroexpand-1 '(create-infrastructure :location))
=> (do
(schema.core/defn my.domain.internal.support.crud-handler/create :-
[my.domain.events/LocationDefinedSchema] [detail__10635__auto__ :-
(:detail my domain.commands/DefineLocationSchema)] (clojure.core/let
[ar__10636__auto__ (my.domain.internal.model.common/new-ar
detail__10635__auto__) event__10637__auto__ (my.domain.events/event
:location-defined ar__10636__auto__)] [event__10637__auto__])))
This works somewhat but it is missing the '^:always-validate' and I have
tried to use (with-meta) but it just doesn't to do what I want.
Any suggestions on getting the meta to pass through or thoughts on this
macro in general are greatly appreciated!
Thanks!
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