Ancestry Patches

app/models/orchestration_stack.rb

@@ -1,4 +1,6 @@
 require 'ancestry'
+require 'ancestry_patch'
+
 class OrchestrationStack < ApplicationRecord
   require_nested :Status
 

app/models/relationship.rb

@@ -1,4 +1,5 @@
 require 'ancestry'
+require 'ancestry_patch'
 
 class Relationship < ApplicationRecord
   has_ancestry

app/models/service.rb

@@ -1,4 +1,5 @@
 require 'ancestry'
+require 'ancestry_patch'
 
 class Service < ApplicationRecord
   DEFAULT_PROCESS_DELAY_BETWEEN_GROUPS = 120

app/models/tenant.rb

@@ -1,4 +1,5 @@
 require 'ancestry'
+require 'ancestry_patch'
 
 class Tenant < ApplicationRecord
   HARDCODED_LOGO = "custom_logo.png"

lib/patches/ancestry_patch.rb

@@ -0,0 +1,70 @@
+module AncestryInstanceMethodsPatch
+  def update_descendants_with_new_ancestry
+    super
+    unless ancestry_callbacks_disabled?
+      clear_memoized_instance_variables
+      if ancestry_changed? && !new_record? && sane_ancestry?
+        unscoped_descendants.each(&:clear_memoized_instance_variables)
+      end
+    end
+  end
+end
+
+module Ancestry
+  module InstanceMethods
+    prepend AncestryInstanceMethodsPatch
+
+    ANCESTRY_DELIMITER = '/'.freeze
+
+    def parse_ancestry_column(obj)
+      obj.to_s.split(ANCESTRY_DELIMITER).map! { |id| cast_primary_key(id) }
+    end
+
+    def ancestor_ids
+      @_ancestor_ids ||= parse_ancestry_column(read_attribute(ancestry_base_class.ancestry_column))
+    end
+
+    def parent_id
+      return @_parent_id if defined?(@_parent_id)
+      @_parent_id = if @_ancestor_ids
+                      @_ancestor_ids.empty? ? nil : @_ancestor_ids.last
+                    else
+                      col = read_attribute(ancestry_base_class.ancestry_column)
+                      # Specifically not using `.blank?` here because it is
+                      # slower than doing the below.
+                      if col.nil? || col.empty? # rubocop:disable Rails/Blank
+                        nil
+                      else
+                        rindex = col.rindex(ANCESTRY_DELIMITER)
+                        cast_primary_key(rindex ? col[rindex + 1, col.length] : col)
+                      end
+                    end
+    end
+
+    def depth
+      @_depth ||= if @_ancestor_ids
+                    @_ancestor_ids.size
+                  else
+                    col = read_attribute(ancestry_base_class.ancestry_column)
+                    col ? col.count(ANCESTRY_DELIMITER) + 1 : 0
+                  end
+    end
+
+    STRING_BASED_KEYS = %i[string uuid text].freeze
+    def cast_primary_key(key)
+      if STRING_BASED_KEYS.include?(primary_key_type)
+        key
+      else
+        key.to_i
+      end
+    end
+
+    def clear_memoized_instance_variables
+      @_ancestor_ids = nil
+      @_depth        = nil
+
+      # can't assign to `nil` since `nil` could be a valid result
+      remove_instance_variable(:@_parent_id) if defined?(@_parent_id)
+    end
+  end
+end