add empty to piece_jointe

app/models/piece_jointe.rb

@@ -5,13 +5,7 @@ class PieceJointe < ActiveRecord::Base
   mount_uploader :content, PieceJointeUploader
 
 
-  # TODO: remove this function, find another way
-  def self.get_array_id_pj_valid_for_dossier(dossier_id)
-    @array_id_pj_valides = []
-    where(dossier_id: dossier_id).each do |pj_valide|
-      @array_id_pj_valides << pj_valide.type_piece_jointe_id
-    end
-
-    @array_id_pj_valides
+  def empty?
+    content.blank?
   end
 end

spec/models/piece_jointe_spec.rb

@@ -27,4 +27,17 @@ describe PieceJointe do
       end
     end
   end
+
+  describe '#empty?' do
+    let(:piece_jointe) { create(:piece_jointe, content: content) }
+    subject { piece_jointe.empty? }
+    context 'when content is nil' do
+      let(:content) { nil }
+      it { is_expected.to be_truthy }
+    end
+    context 'when content exist' do
+      let(:content) { File.open('./spec/support/files/piece_jointe_388.pdf') }
+      it { is_expected.to be_falsey }
+    end
+  end
 end