Add a chair of governors association

We want to store one single contact who is considered the chair of
governors at the school.

This is only available on conversions as academies do not have
governors.

app/models/contact/project.rb

@@ -9,6 +9,7 @@ def self.policy_class
   has_one :main_contact_for_incoming_trust, class_name: "::Project", inverse_of: :incoming_trust_main_contact
   has_one :main_contact_for_outgoing_trust, class_name: "::Project", inverse_of: :outgoing_trust_main_contact
   has_one :main_contact_for_funding_agreement, class_name: "::Project", inverse_of: :funding_agreement_contact
+  has_one :contact_for_chair_of_governors, class_name: "Conversion::Project", inverse_of: :chair_of_governors_contact
 
   def establishment_main_contact
     project.establishment_main_contact_id == id

app/models/conversion/project.rb

@@ -3,6 +3,10 @@ def self.policy_class
     ProjectPolicy
   end
 
+  has_one :chair_of_governors, class_name: "Contact::Project", inverse_of: :project
+
+  belongs_to :chair_of_governors_contact, inverse_of: :contact_for_chair_of_governors, dependent: :destroy, class_name: "Contact::Project", optional: true
+
   attr_writer :academy
 
   alias_attribute :conversion_date, :significant_date

db/migrate/20240328122736_add_chair_of_governors_to_project.rb

@@ -0,0 +1,5 @@
+class AddChairOfGovernorsToProject < ActiveRecord::Migration[7.0]
+  def change
+    add_column :projects, :chair_of_governors_contact_id, :uuid
+  end
+end

spec/models/contact/project_spec.rb

@@ -2,6 +2,7 @@
 RSpec.describe Contact::Project do
   describe "Relationships" do
     it { is_expected.to belong_to(:project) }
+    it { is_expected.to have_one(:contact_for_chair_of_governors) }
   end
 
   describe "#establishment_main_contact" do

spec/models/conversion/project_spec.rb

@@ -3,6 +3,12 @@
 RSpec.describe Conversion::Project do
   before { mock_successful_api_response_to_create_any_project }
 
+  describe "associations" do
+    describe "chair of governors" do
+      it { is_expected.to belong_to(:chair_of_governors_contact).optional(true) }
+    end
+  end
+
   describe "validations" do
     describe "academy urn" do
       context "when there is no academy urn" do