validation - Using clj-schema to validate that a sequence of maps has unique values for a given key -

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I have a request object that has a sequence of maps. I'd like to validate that there are no duplicate values ​​for the key given in those maps. For example, it is valid: 

  [{id: 1,: data "foo"} {: id 2,: data "bar"}]

This is invalid because it has a duplicate of : id 1 : 

  [{id: 1,: data "foo"} {: id2, : Data "bar"} {: id 1,: data "baz"}]

I currently have something similar: 

  (def- Map-schema item-schema [[: id] integer? [: Data] string?]) How to express the expression of this specificity using Def-map-schema  clj-schema       P>

The CLJ-schema provides a function, clj-schema.schema / simple-schema , which can be used to predict arbitrarily in schemas < Code> with-unique-key-map- schema: 

  How to use it to implement defn maps-with-unique-key? [K] (s) Do / simple-schema [(S / map sequence?) (FN [xs] (= (xs count) (count (different (map # (get% k) xs)))))))))

In REPL: 

  (v / valid? (With-unique map with map: ID) []); = {(Id: 0: foo "bar"} {: id 1: foo "baz"} {: id 2: foo "quux"} = true (v / valid? (With mac-unique-key? ]] == (v / is valid? ([With unique-key-map: id] [{id: 0: foo "bar"} {: id 1: foo "baz"} {: id 0: foo " Queue "}] = = ((ID-of-unique-key ?: id) [[" Do not map "] {: id 0: foo" bar "} {: id 1: foo" baz "} {: ID 2: Foo" quux "}] = = << / code>

(My original answer for Prismatic schema is as follows.)

I do not think that the standard schema distribution has a schematic schema for this, but it is always possible Here is a sketch: 

  (defrecord MapsWithUniqueKey [k] s / schema (Walker [This] is a sketch of   
 (Fn [x] (if (and (or (seq? X) (vector? X) (every? Map? X) (each? # (In it?% K) x) (== (count x) (count (Separate (map # (get% k)))) ()) () [(According to 'map' in this list) (X 'Schema. Macros / Verification-Error with X' (list) - maps-with-unique-key? With the example:  
  (s / check (-> mappsweuthUKKI: ID) [id: ID-ID-unique (with schema.utils / value-name x))) {} Id: foo "quux"}] = = zero ();) S / check (-> MappsWeEUKKI: ID) [{ID: Foo "bar"} {: id 2: foo "baz"} {: id 1: foo "quux"}] == (not (-im- Unique-key-with-map: id a-clojure.lang.PersistentVector))  
 
 returns  zero  returned from the first call, while the latter Return value is a  schema.utils.ValidationError .

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