[Fix #1865] Expose attachment field over API

app/serializers/champ_serializer.rb

@@ -1,5 +1,15 @@
 class ChampSerializer < ActiveModel::Serializer
+  include Rails.application.routes.url_helpers
+
   attributes :value
 
   has_one :type_de_champ
+
+  def value
+    if object.piece_justificative_file.attached?
+      url_for(object.piece_justificative_file)
+    else
+      object.value
+    end
+  end
 end

config/environments/test.rb

@@ -31,6 +31,8 @@ Rails.application.configure do
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
 
+  config.active_storage.service = :local
+
   # Randomize the order test cases are executed.
   config.active_support.test_order = :random
 

spec/serializers/champ_serializer_spec.rb

@@ -0,0 +1,22 @@
+describe ChampSerializer do
+  describe '#attributes' do
+    subject { ChampSerializer.new(champ).serializable_hash }
+
+    context 'when type champ is piece justificative' do
+      include Rails.application.routes.url_helpers
+
+      let(:champ) { create(:champ, type_de_champ: create(:type_de_champ_piece_justificative)) }
+
+      before { champ.piece_justificative_file.attach({ filename: __FILE__, io: File.open(__FILE__) }) }
+      after { champ.piece_justificative_file.purge }
+
+      it { is_expected.to include(value: url_for(champ.piece_justificative_file)) }
+    end
+
+    context 'when type champ is not piece justificative' do
+      let(:champ) { create(:champ, value: "blah") }
+
+      it { is_expected.to include(value: "blah") }
+    end
+  end
+end