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require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/module/attribute_accessors'
module ActiveRecord
ActiveSupport.on_load(:active_record_config) do
mattr_accessor :partial_updates, instance_accessor: false
self.partial_updates = true
end
module AttributeMethods
module Dirty
extend ActiveSupport::Concern
include ActiveModel::Dirty
included do
if self < ::ActiveRecord::Timestamp
raise "You cannot include Dirty after Timestamp"
end
config_attribute :partial_updates
end
# Attempts to +save+ the record and clears changed attributes if successful.
def save(*) #:nodoc:
if status = super
@previously_changed = changes
@changed_attributes.clear
end
status
end
# Attempts to <tt>save!</tt> the record and clears changed attributes if successful.
def save!(*) #:nodoc:
super.tap do
@previously_changed = changes
@changed_attributes.clear
end
end
# <tt>reload</tt> the record and clears changed attributes.
def reload(*) #:nodoc:
super.tap do
@previously_changed.clear
@changed_attributes.clear
end
end
private
# Wrap write_attribute to remember original attribute value.
def write_attribute(attr, value)
attr = attr.to_s
# The attribute already has an unsaved change.
if attribute_changed?(attr)
old = @changed_attributes[attr]
@changed_attributes.delete(attr) unless _field_changed?(attr, old, value)
else
old = clone_attribute_value(:read_attribute, attr)
@changed_attributes[attr] = old if _field_changed?(attr, old, value)
end
# Carry on.
super(attr, value)
end
def update(*)
if partial_updates?
# Serialized attributes should always be written in case they've been
# changed in place.
super(changed | (attributes.keys & self.class.serialized_attributes.keys))
else
super
end
end
def _field_changed?(attr, old, value)
if column = column_for_attribute(attr)
if column.number? && (changes_from_nil_to_empty_string?(column, old, value) ||
changes_from_zero_to_string?(column, old, value))
value = nil
else
value = column.type_cast(value)
end
end
old != value
end
def changes_from_nil_to_empty_string?(column, old, value)
# For nullable numeric columns, NULL gets stored in database for blank (i.e. '') values.
# Hence we don't record it as a change if the value changes from nil to ''.
# If an old value of 0 is set to '' we want this to get changed to nil as otherwise it'll
# be typecast back to 0 (''.to_i => 0)
column.null && (old.nil? || old == 0) && value.blank?
end
def changes_from_zero_to_string?(column, old, value)
# For columns with old 0 and value non-empty string
old == 0 && value.present? && value != '0'
end
end
end
end
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