Add ON DELETE constraint to security_policy_management_project_id

This change adds ON DELETE CASCADE fk constraint
to security_orchestration_policy_configurations table for
security_policy_management_project_id column. This allows
the deletion of security_policy_management_project without
ForeignKeyViolation error.

Changelog: fixed

db/migrate/20210929115340_add_security_policy_configurations_management_project_id_foreign_key.rb

+# frozen_string_literal: true
+
+class AddSecurityPolicyConfigurationsManagementProjectIdForeignKey < Gitlab::Database::Migration[1.0]
+  CONSTRAINT_NAME = 'fk_security_policy_configurations_management_project_id'
+  OLD_CONSTRAINT_NAME = 'fk_rails_42ed6c25ec'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key(:security_orchestration_policy_configurations, :projects, column: :security_policy_management_project_id, on_delete: :cascade, name: CONSTRAINT_NAME)
+    remove_foreign_key_if_exists(:security_orchestration_policy_configurations, column: :security_policy_management_project_id, on_delete: :restrict, name: OLD_CONSTRAINT_NAME)
+  end
+
+  def down
+    add_concurrent_foreign_key(:security_orchestration_policy_configurations, :projects, column: :security_policy_management_project_id, on_delete: :restrict, name: OLD_CONSTRAINT_NAME)
+    remove_foreign_key_if_exists(:security_orchestration_policy_configurations, column: :security_policy_management_project_id, on_delete: :cascade, name: CONSTRAINT_NAME)
+  end
+end

db/schema_migrations/20210929115340

+0de2844fdec43eca860648bdb1a5b184bcc0f79b51086b16d8ef398f32cfd5de
\ No newline at end of file

db/structure.sql

@@ -28639,9 +28639,6 @@ ALTER TABLE ONLY epic_issues
 ALTER TABLE ONLY ci_refs
     ADD CONSTRAINT fk_rails_4249db8cc3 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
 
-ALTER TABLE ONLY security_orchestration_policy_configurations
-    ADD CONSTRAINT fk_rails_42ed6c25ec FOREIGN KEY (security_policy_management_project_id) REFERENCES projects(id) ON DELETE RESTRICT;
-
 ALTER TABLE ONLY ci_resources
     ADD CONSTRAINT fk_rails_430336af2d FOREIGN KEY (resource_group_id) REFERENCES ci_resource_groups(id) ON DELETE CASCADE;
 
@@ -29821,6 +29818,9 @@ ALTER TABLE ONLY resource_label_events
 ALTER TABLE ONLY ci_builds_metadata
     ADD CONSTRAINT fk_rails_ffcf702a02 FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY security_orchestration_policy_configurations
+    ADD CONSTRAINT fk_security_policy_configurations_management_project_id FOREIGN KEY (security_policy_management_project_id) REFERENCES projects(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY integrations
     ADD CONSTRAINT fk_services_inherit_from_id FOREIGN KEY (inherit_from_id) REFERENCES integrations(id) ON DELETE CASCADE;
 

ee/spec/models/project_spec.rb

@@ -254,6 +254,18 @@ RSpec.describe Project do
         end
       end
     end
+
+    context 'when deleting security policy project' do
+      let_it_be(:project) { create(:project) }
+      let_it_be(:policy_management_project) { create(:project) }
+      let_it_be(:policy_configuration) { create(:security_orchestration_policy_configuration, security_policy_management_project: policy_management_project, project: project) }
+
+      it 'also deletes the associated security_orchestration_policy_configuration' do
+        policy_management_project.delete
+
+        expect(project.reload.security_orchestration_policy_configuration).to be_nil
+      end
+    end
   end
 
   context 'scopes' do