There is a map like this
{:buyers [{:name "James" :city "Berlin"} {:name "Jane" :city "Milan"}]
:sellers [{:name "Dustin" :city "Turin" :age "21"} {:name "Mark" :city "Milan"}]}
and I need to check only for :sellers
that all the keys :name, :city and :age
are present and if one is missing drop
that map all together and have a new structure as below:
{:buyers [{:name "James" :city "Berlin"} {:name "Jane" :city "Milan"}]
:sellers [{:name "Dustin" :city "Turin" :age "21"}]}
CodePudding user response:
(let [data {:buyers [{:name "James" :city "Berlin"} {:name "Jane" :city "Milan"}]
:sellers [{:name "Dustin" :city "Turin" :age "21"} {:name "Mark" :city "Milan"}]}]
(update data :sellers #(filter (every-pred :name :city :age) %)))
CodePudding user response:
To make the code more readable, I created a new predicate, valid-seller?
, and put validation there. You can use any of these versions:
Pure Clojure:
(defn valid-seller? [m]
(every? #(contains? m %) [:name :city :age]))
Spec:
[org.clojure/spec.alpha "0.3.218"]
, require [clojure.spec.alpha :as spec]
(defn valid-seller? [m]
(spec/valid? (spec/keys :req-un [::name ::city ::age]) m))
Malli (if you also want to test type of values):
[metosin/malli "0.8.9"]
, require [malli.core :as malli]
(defn valid-seller? [m]
(malli/validate [:map
[:name :string]
[:city :string]
[:age :string]] m))
Then I used this predicate:
(update {:buyers [{:name "James" :city "Berlin"} {:name "Jane" :city "Milan"}]
:sellers [{:name "Dustin" :city "Turin" :age "21"} {:name "Mark" :city "Milan"}]}
:sellers
#(filter valid-seller? %))
=>
{:buyers [{:name "James", :city "Berlin"} {:name "Jane", :city "Milan"}],
:sellers ({:name "Dustin", :city "Turin", :age "21"})}
After your answer, I think you should use Malli, as it also checks the type of values. You can use some?
for any non-nil value:
(defn valid-seller? [m]
(malli/validate [:map
[:name some?]
[:city some?]
[:age some?]] m))