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module ActiveRecord
class AttributeMutationTracker # :nodoc:
def initialize(attributes)
@attributes = attributes
end
def changed_values
attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
if changed?(attr_name)
result[attr_name] = attributes[attr_name].original_value
end
end
end
def changes
attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
if changed?(attr_name)
result[attr_name] = [attributes[attr_name].original_value, attributes.fetch_value(attr_name)]
end
end
end
def changed?(attr_name)
attr_name = attr_name.to_s
attributes[attr_name].changed?
end
def changed_in_place?(attr_name)
attributes[attr_name].changed_in_place?
end
def forget_change(attr_name)
attr_name = attr_name.to_s
attributes[attr_name] = attributes[attr_name].forgetting_assignment
end
protected
attr_reader :attributes
private
def attr_names
attributes.keys
end
end
class NullMutationTracker # :nodoc:
include Singleton
def changed_values
{}
end
def changes
{}
end
def changed?(*)
false
end
def changed_in_place?(*)
false
end
def forget_change(*)
end
end
end
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