1 files changed, 32 insertions, 0 deletions
diff --git a/rubocop/cop/migration/async_post_migrate_only.rb b/rubocop/cop/migration/async_post_migrate_only.rb
new file mode 100644
index 00000000000..e5b78617691
--- /dev/null
+++ b/rubocop/cop/migration/async_post_migrate_only.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require_relative '../../migration_helpers'
+
+module RuboCop
+  module Cop
+    module Migration
+      # Ensures that asynchronous index helper methods are only called from post migrations.
+      class AsyncPostMigrateOnly < RuboCop::Cop::Base
+        include MigrationHelpers
+
+        MSG = 'Async index operations must be performed in a post-deployment migration.'
+
+        FORBIDDEN_METHODS = %i[
+          prepare_async_index
+          unprepare_async_index
+          prepare_async_index_removal
+          unprepare_async_index
+        ].freeze
+
+        def on_send(node)
+          return unless in_migration?(node)
+          return unless time_enforced?(node)
+          return unless FORBIDDEN_METHODS.include?(node.method_name)
+          return if in_post_deployment_migration?(node)
+
+          add_offense(node, message: MSG)
+        end
+      end
+    end
+  end
+end