Pulling parts of the schema out into variables

[atroche]

Hi,

The schema I'm building is pretty big, and it'd be nice to build it up out of named parts rather than just having a single large map.

To take a small example, instead of doing…

(def author
  '{:name   str
    :email  str
    :locale '(or "en" "jp" "de")})

I'd like to do:

(def locale '(or "en" "jp" "de"))

(def author
  '{:name   str
    :email  str
    :locale locale})

But I can't find a way to do this. Any tips would be much appreciated!

Cheers.

[atroche]

So far the only way I have of doing this is:

(def author
  `{:name   ~'str
    :email  ~'str
    :locale ~locale})

Which is pretty ugly…

[atroche]

Ah, I found your link to backtick in this issue comment, and using its template macro I can do:

(def author
  (template {:name   str
             :email  str
             :locale ~locale}))

I'm surprised this isn't a use case you've come across in your own work, @miner. What do you do for large schemas?

[miner]

The (grammar ...) pattern lets you give names to subparts of a schema. You can also merge-schema to share grammar "rules". I use Backtick template to make use of other Clojure data in schemas.