Duplicate key and custom generators

[Andrea Richiardi]

Hello plumatic,

I am playing with generators, which are definitely fun to use, one thing I am trying to achieve is to have custom (and meaningful) generators.

So I tried (using paraseba/faker):

(sgen/generate as/User {as/FirstName (tcgen/return (fname/first-name))

                                        as/LastName (tcgen/return (fname/last-name))})

where:

(def FirstName s/Str)

(def LastName s/Str)

(def User {(s/required-key :id) s/Int

           :first-name FirstName

           :last-name LastName

           :password s/Str})

But of course I get a java.lang.IllegalArgumentException: Duplicate key: class java.lang.String.

I also tried:

(sgen/generate as/User {as/FirstName (tcgen/return (fname/first-name))} {as/LastName (tcgen/return (fname/last-name))})

but here I get:

java.lang.ClassCastException: clojure.test.check.generators.Generator cannot be cast to clojure.lang.IFn

How can I handle this case (there must a very easy solution I am not seeing) ?

[Jason Wolfe]

Hi Andrea, 

Currently FirstName and LastName are different names for an identical schema, so there's no way to attach different generators.  

The simplest solution is to use `s/named` to ensure that FirstName and LastName are different schemas, e.g.

(def FirstName (s/named s/Str 'first))

(def LastName (s/named s/Str 'last)) 

HTH,

Jason

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[Andrea Richiardi]

On Sunday, May 22, 2016 at 7:23:56 PM UTC-7, Jason Wolfe wrote:

Hi Andrea, 

(def FirstName (s/named s/Str 'first))

(def LastName (s/named s/Str 'last)) 

This works fine, an additional question would be, is there a way to "store" this generator against my new version of User now?

I know this can be somehow done with custom functions, just asking in case you have a ready-made solution :)

[Jason Wolfe]

You can just def your map of User-related generators, and use / merge them with others when needed.  There isn't a special registry, but in my experience just normal Clojure vars usually suffice.  

Best,

Jason

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[Andrea Richiardi]

That's ok, in any case it is just data, so vars are really ok here.

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