return communes with the APIGeoService

app/services/api_geo_service.rb

@@ -47,6 +47,25 @@ class APIGeoService
       departements.find { _1[:name] == name }&.dig(:code)
     end
 
+    def communes(departement_code)
+      get_from_api_geo(
+        "communes?codeDepartement=#{departement_code}",
+        additional_keys: { postal_codes: :codesPostaux }
+      ).sort_by { I18n.transliterate(_1[:name]) }
+    end
+
+    def commune_name(departement_code, code)
+      communes(departement_code).find { _1[:code] == code }&.dig(:name)
+    end
+
+    def commune_code(departement_code, name)
+      communes(departement_code).find { _1[:name] == name }&.dig(:code)
+    end
+
+    def commune_postal_codes(departement_code, code)
+      communes(departement_code).find { _1[:code] == code }&.dig(:postal_codes)
+    end
+
     def epcis(departement_code)
       get_from_api_geo("epcis?codeDepartement=#{departement_code}").sort_by { I18n.transliterate(_1[:name]) }
     end
@@ -61,11 +80,16 @@ class APIGeoService
 
     private
 
-    def get_from_api_geo(scope)
+    def get_from_api_geo(scope, additional_keys: {})
       Rails.cache.fetch("api_geo_#{scope}", expires_in: 1.year) do
         response = Typhoeus.get("#{API_GEO_URL}/#{scope}")
-        JSON.parse(response.body).map(&:symbolize_keys)
-          .map { { name: _1[:nom].tr("'", '’'), code: _1[:code] } }
+        JSON.parse(response.body)
+          .map(&:symbolize_keys)
+          .map do |result|
+            data = { name: result[:nom].tr("'", '’'), code: result[:code] }
+            additional_keys.each { |key, value| data = data.merge(key => result[value]) }
+            data
+          end
       end
     end
 

spec/services/api_geo_service_spec.rb

@@ -43,6 +43,29 @@ describe APIGeoService do
     end
   end
 
+  describe 'communes', vcr: { cassette_name: 'api_geo_communes' } do
+    it 'return sorted results' do
+      expect(APIGeoService.communes('01').size).to eq(393)
+      expect(APIGeoService.communes('01').first).to eq(code: '01004', name: 'Ambérieu-en-Bugey', postal_codes: ['01500'])
+      expect(APIGeoService.communes('01').last).to eq(code: '01457', name: 'Vonnas', postal_codes: ['01540'])
+    end
+  end
+
+  describe 'commune_name', vcr: { cassette_name: 'api_geo_communes' } do
+    subject { APIGeoService.commune_name('01', '01457') }
+    it { is_expected.to eq('Vonnas') }
+  end
+
+  describe 'commune_code', vcr: { cassette_name: 'api_geo_communes' } do
+    subject { APIGeoService.commune_code('01', 'Vonnas') }
+    it { is_expected.to eq('01457') }
+  end
+
+  describe 'commune_postal_codes', vcr: { cassette_name: 'api_geo_communes' } do
+    subject { APIGeoService.commune_postal_codes('01', '01457') }
+    it { is_expected.to eq(['01540']) }
+  end
+
   describe 'epcis', vcr: { cassette_name: 'api_geo_epcis' } do
     it 'return sorted results' do
       expect(APIGeoService.epcis('01').size).to eq(17)