models: require belong_to associations on individual

app/models/individual.rb

@@ -12,7 +12,7 @@
 #  dossier_id :integer
 #
 class Individual < ApplicationRecord
-  belongs_to :dossier
+  belongs_to :dossier, optional: false
 
   validates :dossier_id, uniqueness: true
   validates :gender, presence: true, allow_nil: false, on: :update

spec/factories/dossier.rb

@@ -49,7 +49,7 @@ FactoryBot.define do
         if !dossier.procedure.for_individual?
           raise 'Inconsistent factory: attempting to create a dossier :with_individual on a procedure that is not `for_individual?`'
         end
-        dossier.individual = create(:individual)
+        dossier.individual = build(:individual, dossier: dossier)
       end
     end
 

spec/factories/individual.rb

@@ -4,5 +4,6 @@ FactoryBot.define do
     nom { 'Julien' }
     prenom { 'Xavier' }
     birthdate { Date.new(1991, 11, 01) }
+    association :dossier
   end
 end

spec/helpers/dossier_helper_spec.rb

@@ -41,8 +41,8 @@ RSpec.describe DossierHelper, type: :helper do
   describe ".demandeur_dossier" do
     subject { demandeur_dossier(dossier) }
 
-    let(:individual) { create(:individual) }
-    let(:etablissement) { create(:etablissement) }
+    let(:individual) { build(:individual, dossier: nil) }
+    let(:etablissement) { build(:etablissement) }
     let(:dossier) { create(:dossier, procedure: procedure, individual: individual, etablissement: etablissement) }
 
     context "when the dossier is for an individual" do

spec/models/individual_spec.rb

@@ -2,7 +2,7 @@ describe Individual do
   it { is_expected.to have_db_column(:gender) }
   it { is_expected.to have_db_column(:nom) }
   it { is_expected.to have_db_column(:prenom) }
-  it { is_expected.to belong_to(:dossier) }
+  it { is_expected.to belong_to(:dossier).required }
 
   describe "#save" do
     let(:individual) { build(:individual) }