1# frozen_string_literal: true
2
3module Ci
4  # This model represents a record in a shadow table of the main database's namespaces table.
5  # It allows us to navigate the namespace hierarchy on the ci database without resorting to a JOIN.
6  class NamespaceMirror < ApplicationRecord
7    belongs_to :namespace
8
9    scope :contains_namespace, -> (id) do
10      where('traversal_ids @> ARRAY[?]::int[]', id)
11    end
12
13    class << self
14      def sync!(event)
15        namespace = event.namespace
16        traversal_ids = namespace.self_and_ancestor_ids(hierarchy_order: :desc)
17
18        upsert({ namespace_id: event.namespace_id, traversal_ids: traversal_ids },
19               unique_by: :namespace_id)
20
21        # It won't be necessary once we remove `sync_traversal_ids`.
22        # More info: https://gitlab.com/gitlab-org/gitlab/-/issues/347541
23        sync_children_namespaces!(event.namespace_id, traversal_ids)
24      end
25
26      private
27
28      def sync_children_namespaces!(namespace_id, traversal_ids)
29        contains_namespace(namespace_id)
30          .where.not(namespace_id: namespace_id)
31          .update_all(
32            "traversal_ids = ARRAY[#{sanitize_sql(traversal_ids.join(','))}]::int[] || traversal_ids[array_position(traversal_ids, #{sanitize_sql(namespace_id)}) + 1:]"
33          )
34      end
35    end
36  end
37end
38