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require 'active_support/core_ext/module/attribute_accessors'
module ActiveRecord
module AttributeMethods
module Dirty # :nodoc:
extend ActiveSupport::Concern
include ActiveModel::Dirty
included do
if self < ::ActiveRecord::Timestamp
raise "You cannot include Dirty after Timestamp"
end
class_attribute :partial_writes, instance_writer: false
self.partial_writes = true
end
# Attempts to +save+ the record and clears changed attributes if successful.
def save(*)
if status = super
changes_applied
end
status
end
# Attempts to <tt>save!</tt> the record and clears changed attributes if successful.
def save!(*)
super.tap do
changes_applied
end
end
# <tt>reload</tt> the record and clears changed attributes.
def reload(*)
super.tap do
reset_changes
end
end
def initialize_dup(other) # :nodoc:
super
init_changed_attributes
end
private
def initialize_internals_callback
super
init_changed_attributes
end
def init_changed_attributes
@changed_attributes = nil
# Intentionally avoid using #column_defaults since overridden defaults (as is done in
# optimistic locking) won't get written unless they get marked as changed
self.class.columns.each do |c|
attr, orig_value = c.name, c.default
changed_attributes[attr] = orig_value if _field_changed?(attr, orig_value)
end
end
# Wrap write_attribute to remember original attribute value.
def write_attribute(attr, value)
attr = attr.to_s
old_value = old_attribute_value(attr)
result = super(attr, value)
save_changed_attribute(attr, old_value)
result
end
def save_changed_attribute(attr, old_value)
if attribute_changed?(attr)
changed_attributes.delete(attr) unless _field_changed?(attr, old_value)
else
changed_attributes[attr] = old_value if _field_changed?(attr, old_value)
end
end
def old_attribute_value(attr)
if attribute_changed?(attr)
changed_attributes[attr]
else
clone_attribute_value(:read_attribute, attr)
end
end
def _update_record(*)
partial_writes? ? super(keys_for_partial_write) : super
end
def _create_record(*)
partial_writes? ? super(keys_for_partial_write) : super
end
# Serialized attributes should always be written in case they've been
# changed in place.
def keys_for_partial_write
changed
end
def _field_changed?(attr, old_value)
new_value = read_attribute(attr)
raw_value = read_attribute_before_type_cast(attr)
column_for_attribute(attr).changed?(old_value, new_value, raw_value)
end
end
end
end
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