gen/not-empty equivalent for s/Str in schema-generators?

[Sean Grove]

Right now I'm struggling with the validity of generated data. I have something like this:

{:uid s/Str}

as my description, but really it has to be a non-empty string, such that

(not (empty? (:uid data)))

will pass. Unfortunately, the data generated will generally *start* at the empty string.

Is there a way to easily get schema-generators to restrict the values of generated strings?

Thanks!

Best,

Sean

[Jason Wolfe]

Hi Sean,

You can use `(s/constrained s/Str seq)`, which will both enforce
non-emptiness and backtrack past generation of empty strings.

If you just want to affect generation, or the constraint is more
stringent (so backtracking is slow and/or eventually fails) then you
can pass a custom generator to the generation process instead. E.g.

(def UID (s/named String 'UID))

and then you can pass a custom generator map `{UID my-uid-generator}`
into generation or completion.

Is that what you're looking for?

Cheers,
Jason

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