feat: import org relationships in initial imports

app/services/imports/lettings_logs_import_service.rb

@@ -257,7 +257,6 @@ module Imports
 
       apply_date_consistency!(attributes)
       apply_household_consistency!(attributes)
-      create_organisation_relationship!(attributes)
 
       lettings_log = save_lettings_log(attributes, previous_status)
       compute_differences(lettings_log, attributes)
@@ -642,13 +641,5 @@ module Imports
         0
       end
     end
-
-    def create_organisation_relationship!(attributes)
-      parent_organisation_id = attributes["owning_organisation_id"]
-      child_organisation_id = attributes["managing_organisation_id"]
-      return if parent_organisation_id == child_organisation_id
-
-      OrganisationRelationship.find_or_create_by!(parent_organisation_id:, child_organisation_id:)
-    end
   end
 end

app/services/imports/organisation_relationship_import_service.rb

@@ -0,0 +1,18 @@
+module Imports
+  class OrganisationRelationshipImportService < ImportService
+    def create_organisation_relationships(folder)
+      import_from(folder, :create_organisation_relationships)
+    end
+
+    private
+
+    def create_organisation_relationship(xml_document)
+      parent_organisation_id = find_organisation_id(xml_document, "parent-institution")
+      child_organisation_id = find_organisation_id(xml_document, "child-institution")
+
+      return if parent_organisation_id == child_organisation_id
+
+      OrganisationRelationship.find_or_create_by!(parent_organisation_id:, child_organisation_id:)
+    end
+  end
+end

lib/tasks/full_import.rake

@@ -12,6 +12,7 @@ namespace :import do
 
     initial_import_list = [
       Import.new(Imports::OrganisationImportService, :create_organisations, "institution"),
+      Import.new(Imports::OrganisationRelationshipImportService, :create_organisation_relationships, "institution-link"),
       Import.new(Imports::SchemeImportService, :create_schemes, "mgmtgroups"),
       Import.new(Imports::SchemeLocationImportService, :create_scheme_locations, "schemes"),
       Import.new(Imports::UserImportService, :create_users, "user"),