fix(transfer): manually nullify staled transfers references

app/controllers/users/transfers_controller.rb

@@ -16,7 +16,7 @@ module Users
         .joins(:dossiers)
         .find_by!(id: params[:id], dossiers: { user: current_user })
 
-      transfer.destroy
+      transfer.destroy_and_nullify
       redirect_to dossiers_path
     end
 

app/jobs/cron/purge_stale_transfers_job.rb

@@ -2,6 +2,6 @@ class Cron::PurgeStaleTransfersJob < Cron::CronJob
   self.schedule_expression = "every day at midnight"
 
   def perform
-    DossierTransfer.stale.destroy_all
+    DossierTransfer.destroy_stale
   end
 end

app/models/dossier_transfer.rb

@@ -45,6 +45,22 @@ class DossierTransfer < ApplicationRecord
     User.find_by(email: email)&.locale || I18n.default_locale
   end
 
+  def destroy_and_nullify
+    transaction do
+      # Rails cascading is not working with default scopes. Doing nullify cascade manually.
+      Dossier.with_discarded.where(transfer: self).update_all(dossier_transfer_id: nil)
+      destroy
+    end
+  end
+
+  def self.destroy_stale
+    transaction do
+      # Rails cascading is not working with default scopes. Doing nullify cascade manually.
+      Dossier.with_discarded.where(transfer: stale).update_all(dossier_transfer_id: nil)
+      stale.destroy_all
+    end
+  end
+
   private
 
   def send_notification

spec/models/dossier_transfer_spec.rb

@@ -46,16 +46,36 @@ RSpec.describe DossierTransfer, type: :model do
         it { expect(DossierTransfer.with_dossiers.count).to eq(0) }
       end
     end
+  end
 
-    describe 'dossier relationship' do
-      let(:transfer) { create(:dossier_transfer) }
-      let(:dossier) { create(:dossier, user: user, transfer: transfer) }
+  describe '#destroy_and_nullify' do
+    let(:transfer) { create(:dossier_transfer) }
+    let(:dossier) { create(:dossier, user: user, transfer: transfer) }
+    let(:discarded_dossier) { create(:dossier, user: user, transfer: dossier.transfer) }
 
-      it 'nullify transfer relationship on dossier' do
-        expect(dossier.transfer).to eq(transfer)
-        transfer.destroy
-        expect(dossier.reload.transfer).to be_nil
-      end
+    before do
+      discarded_dossier.discard!
+    end
+
+    it 'nullify transfer relationship on dossier' do
+      expect(dossier.transfer).to eq(transfer)
+      transfer.destroy_and_nullify
+      expect(dossier.reload.transfer).to be_nil
+    end
+  end
+
+  describe '#destroy_stale' do
+    let(:transfer) { create(:dossier_transfer, created_at: 1.month.ago) }
+    let(:dossier) { create(:dossier, user: user, transfer: transfer) }
+    let(:discarded_dossier) { create(:dossier, user: user, transfer: dossier.transfer) }
+
+    before do
+      discarded_dossier.discard!
+    end
+
+    it 'nullify the transfer on discarded dossier' do
+      DossierTransfer.destroy_stale
+      expect(DossierTransfer.count).to eq(0)
     end
   end
 end