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# frozen_string_literal: true
require "active_support/core_ext/hash/indifferent_access"
require "active_support/core_ext/object/duplicable"
module ActiveModel
class AttributeMutationTracker # :nodoc:
OPTION_NOT_GIVEN = Object.new
def initialize(attributes, forced_changes = Set.new)
@attributes = attributes
@forced_changes = forced_changes
end
def changed_attribute_names
attr_names.select { |attr_name| changed?(attr_name) }
end
def changed_values
attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
if changed?(attr_name)
result[attr_name] = original_value(attr_name)
end
end
end
def changes
attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
if change = change_to_attribute(attr_name)
result.merge!(attr_name => change)
end
end
end
def change_to_attribute(attr_name)
if changed?(attr_name)
[original_value(attr_name), fetch_value(attr_name)]
end
end
def any_changes?
attr_names.any? { |attr| changed?(attr) }
end
def changed?(attr_name, from: OPTION_NOT_GIVEN, to: OPTION_NOT_GIVEN)
attribute_changed?(attr_name) &&
(OPTION_NOT_GIVEN == from || original_value(attr_name) == from) &&
(OPTION_NOT_GIVEN == to || fetch_value(attr_name) == to)
end
def changed_in_place?(attr_name)
attributes[attr_name].changed_in_place?
end
def forget_change(attr_name)
attributes[attr_name] = attributes[attr_name].forgetting_assignment
forced_changes.delete(attr_name)
end
def original_value(attr_name)
attributes[attr_name].original_value
end
def force_change(attr_name)
forced_changes << attr_name
end
private
attr_reader :attributes, :forced_changes
def attr_names
attributes.keys
end
def attribute_changed?(attr_name)
forced_changes.include?(attr_name) || !!attributes[attr_name].changed?
end
def fetch_value(attr_name)
attributes.fetch_value(attr_name)
end
end
class ForcedMutationTracker < AttributeMutationTracker # :nodoc:
def initialize(attributes, forced_changes = {})
super
@finalized_changes = nil
end
def changed_in_place?(attr_name)
false
end
def change_to_attribute(attr_name)
if finalized_changes&.include?(attr_name)
finalized_changes[attr_name].dup
else
super
end
end
def forget_change(attr_name)
forced_changes.delete(attr_name)
end
def original_value(attr_name)
if changed?(attr_name)
forced_changes[attr_name]
else
fetch_value(attr_name)
end
end
def force_change(attr_name)
forced_changes[attr_name] = clone_value(attr_name) unless attribute_changed?(attr_name)
end
def finalize_changes
@finalized_changes = changes
end
private
attr_reader :finalized_changes
def attr_names
forced_changes.keys
end
def attribute_changed?(attr_name)
forced_changes.include?(attr_name)
end
def fetch_value(attr_name)
attributes.send(:_read_attribute, attr_name)
end
def clone_value(attr_name)
value = fetch_value(attr_name)
value.duplicable? ? value.clone : value
rescue TypeError, NoMethodError
value
end
end
class NullMutationTracker # :nodoc:
include Singleton
def changed_attribute_names
[]
end
def changed_values
{}
end
def changes
{}
end
def change_to_attribute(attr_name)
end
def any_changes?
false
end
def changed?(attr_name, **)
false
end
def changed_in_place?(attr_name)
false
end
def original_value(attr_name)
end
end
end
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