rna champ can fetch it's own association

app/models/champs/rna_champ.rb

@@ -21,6 +21,8 @@
 #  row_id                         :string
 #
 class Champs::RNAChamp < Champ
+  include RNAChampAssociationFetchableConcern
+
   validates :value, allow_blank: true, format: {
     with: /\AW[0-9]{9}\z/, message: I18n.t(:not_a_rna, scope: 'activerecord.errors.messages')
   }, if: -> { validation_context != :brouillon }

app/models/concerns/rna_champ_association_fetchable_concern.rb

@@ -0,0 +1,16 @@
+module RNAChampAssociationFetchableConcern
+  extend ActiveSupport::Concern
+
+  def fetch_association!(rna)
+    data = APIEntreprise::RNAAdapter.new(rna, procedure_id).to_params
+    update!(data: data, value: rna)
+    nil
+  rescue APIEntreprise::API::Error, ActiveRecord::RecordInvalid => error
+    update(data: nil, value: nil)
+    if error.try(:network_error?) && !APIEntrepriseService.api_up?
+      :network_error
+    else
+      nil
+    end
+  end
+end

spec/models/concern/rna_champ_association_fetchable_concern_spec.rb

@@ -0,0 +1,90 @@
+RSpec.describe RNAChampAssociationFetchableConcern do
+  describe '.fetch_association!' do
+    let!(:champ) { create(:champ_rna, data: "not nil data") }
+
+    before do
+      stub_request(:get, /https:\/\/entreprise.api.gouv.fr\/v2\/associations\//)
+        .to_return(body: body, status: status)
+      allow_any_instance_of(APIEntrepriseToken).to receive(:expired?).and_return(false)
+    end
+
+    subject(:fetch_association!) { champ.fetch_association!(rna) }
+
+    shared_examples "an association fetcher" do |expected_result, expected_value, expected_data|
+      it { expect(fetch_association!).to eq(expected_result) }
+
+      it { expect { fetch_association! }.to change { champ.reload.value }.to(expected_value) }
+
+      it { expect { fetch_association! }.to change { champ.reload.data }.to(expected_data) }
+    end
+
+    context 'when the RNA is empty' do
+      let(:rna) { '' }
+      let(:status) { 422 }
+      let(:body) { '' }
+
+      it_behaves_like "an association fetcher", nil, '', {}
+    end
+
+    context 'when the RNA is invalid' do
+      let(:rna) { '1234' }
+      let(:status) { 422 }
+      let(:body) { '' }
+
+      it_behaves_like "an association fetcher", nil, nil, nil
+    end
+
+    context 'when the RNA is unknow' do
+      let(:rna) { 'W111111111' }
+      let(:status) { 404 }
+      let(:body) { '' }
+
+      it_behaves_like "an association fetcher", nil, 'W111111111', {}
+    end
+
+    context 'when the API is unavailable due to network error' do
+      let(:rna) { 'W595001988' }
+      let(:status) { 503 }
+      let(:body) { File.read('spec/fixtures/files/api_entreprise/associations.json') }
+
+      before { expect(APIEntrepriseService).to receive(:api_up?).and_return(false) }
+
+      it_behaves_like "an association fetcher", :network_error, nil, nil
+    end
+
+    context 'when the RNA informations are retrieved successfully' do
+      let(:rna) { 'W595001988' }
+      let(:status) { 200 }
+      let(:body) { File.read('spec/fixtures/files/api_entreprise/associations.json') }
+
+      it_behaves_like "an association fetcher", nil, 'W595001988', {
+        "association_id" => "W595001988",
+        "association_titre" => "UN SUR QUATRE",
+        "association_objet" => "valoriser, transmettre et partager auprès des publics les plus larges possibles, les bienfaits de l'immigration, la richesse de la diversité et la curiosité de l'autre autrement",
+        "association_siret" => nil,
+        "association_date_creation" => "2014-01-23",
+        "association_date_declaration" => "2014-01-24",
+        "association_date_publication" => "2014-02-08",
+        "association_date_dissolution" => "0001-01-01",
+        "association_adresse_siege" => {
+          "complement" => "",
+          "numero_voie" => "61",
+          "type_voie" => "RUE",
+          "libelle_voie" => "des Noyers",
+          "distribution" => "_",
+          "code_insee" => "93063",
+          "code_postal" => "93230",
+          "commune" => "Romainville"
+        },
+        "association_code_civilite_dirigeant" => "PM",
+        "association_civilite_dirigeant" => "Monsieur le Président",
+        "association_code_etat" => "A",
+        "association_etat" => "Active",
+        "association_code_groupement" => "S",
+        "association_groupement" => "simple",
+        "association_mise_a_jour" => 1392295833,
+        "association_rna" => "W595001988"
+      }
+    end
+  end
+end