fix(invitation): don't fail when dossier is hidden & user signed on another account

Suite de 45994ff567
Cf https://sentry.io/organizations/demarches-simplifiees/issues/3422144920/events/e1c83ea74dbc410ea22aa17ef29fb329/?project=1429550

app/models/targeted_user_link.rb

@@ -25,7 +25,8 @@ class TargetedUserLink < ApplicationRecord
     when 'avis'
       user.email
     when 'invite'
-      target_model.user&.email || target_model.email
+      invite = find_invite!
+      invite.user&.email || invite.email
     else
       raise 'invalid target_context'
     end
@@ -34,14 +35,12 @@ class TargetedUserLink < ApplicationRecord
   def redirect_url(url_helper)
     case target_context
     when "invite"
-      invite = target_model
-
-      fail ActiveRecord::RecordNotFound if invite.nil?
+      invite = find_invite!
 
       user = User.find_by(email: target_email)
       user&.active? ?
-      url_helper.invite_path(invite) :
-      url_helper.invite_path(invite, params: { email: invite.email })
+        url_helper.invite_path(invite) :
+        url_helper.invite_path(invite, params: { email: invite.email })
     when "avis"
       avis = target_model
       avis.expert.user.active? ?
@@ -49,4 +48,10 @@ class TargetedUserLink < ApplicationRecord
         url_helper.sign_up_expert_avis_path(avis.procedure, avis, email: avis.expert.email)
     end
   end
+
+  private
+
+  def find_invite!
+    target_model || (fail ActiveRecord::RecordNotFound.new("Could not find Invite with id `#{target_model_id}`"))
+  end
 end

spec/controllers/targeted_user_links_controller_spec.rb

@@ -102,6 +102,13 @@ describe TargetedUserLinksController, type: :controller do
           expect(response).to redirect_to(root_path)
           expect(flash[:error]).to match(/dossier n'est plus accessible/)
         end
+
+        it 'redirect nicely also when user is signed on another account' do
+          sign_in(create(:expert).user)
+          get :show, params: { id: targeted_user_link.id }
+          expect(response).to redirect_to(root_path)
+          expect(flash[:error]).to match(/dossier n'est plus accessible/)
+        end
       end
     end