thanks for the help @alexmiller

if i have a person comprising of an id (int) and a name (string), how can i write a spec for a collection of people to ensure there are no duplicate IDs?

@mikecarter distinct??

@potetm would that catch [{:id 1 :name "Alex"} {:id 1 :name "Frank"}]?

Something like (apply distinct? (map :id people)) would I think.

(apply distinct? (map :id 
                      [{:id 1 :name "Alex"} 
                       {:id 1 :name "Frank"}]))
=> false
(apply distinct? (map :id 
                      [{:id 1 :name "Alex"} 
                       {:id 2 :name "Frank"}]))
=> true

@potetm thanks! i’ll give it a go