fix(api-v1): dossier -> avis -> piece_justificative_file_attachment relation name

app/models/dossier.rb

@@ -280,7 +280,7 @@ class Dossier < ApplicationRecord
       .includes(commentaires: { piece_jointe_attachment: :blob },
         justificatif_motivation_attachment: :blob,
         attestation: [],
-        avis: { piece_justificative_file_attachments: :blob },
+        avis: { piece_justificative_file_attachment: :blob },
         traitement: [],
         etablissement: [],
         individual: [],

spec/controllers/api/v1/dossiers_controller_spec.rb

@@ -316,6 +316,14 @@ describe API::V1::DossiersController do
           it { expect(subject.first[:email]).to eq 'plop@plip.com' }
         end
 
+        describe 'avis' do
+          let!(:avis) { create(:avis, dossier: dossier) }
+
+          subject { super()[:avis] }
+
+          it { expect(subject[0][:introduction]).to eq(avis.introduction) }
+        end
+
         describe 'etablissement' do
           let(:field_list) {
             [