diff options
Diffstat (limited to 'activerecord/lib/active_record/dirty.rb')
| -rw-r--r-- | activerecord/lib/active_record/dirty.rb | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/activerecord/lib/active_record/dirty.rb b/activerecord/lib/active_record/dirty.rb deleted file mode 100644 index 178767e0c3..0000000000 --- a/activerecord/lib/active_record/dirty.rb +++ /dev/null @@ -1,186 +0,0 @@ -module ActiveRecord - # Track unsaved attribute changes. - # - # A newly instantiated object is unchanged: - # person = Person.find_by_name('uncle bob') - # person.changed? # => false - # - # Change the name: - # person.name = 'Bob' - # person.changed? # => true - # person.name_changed? # => true - # person.name_was # => 'uncle bob' - # person.name_change # => ['uncle bob', 'Bob'] - # person.name = 'Bill' - # person.name_change # => ['uncle bob', 'Bill'] - # - # Save the changes: - # person.save - # person.changed? # => false - # person.name_changed? # => false - # - # Assigning the same value leaves the attribute unchanged: - # person.name = 'Bill' - # person.name_changed? # => false - # person.name_change # => nil - # - # Which attributes have changed? - # person.name = 'bob' - # person.changed # => ['name'] - # person.changes # => { 'name' => ['Bill', 'bob'] } - # - # Before modifying an attribute in-place: - # person.name_will_change! - # person.name << 'by' - # person.name_change # => ['uncle bob', 'uncle bobby'] - module Dirty - extend ActiveSupport::Concern - - DIRTY_SUFFIXES = ['_changed?', '_change', '_will_change!', '_was'] - - included do - attribute_method_suffix *DIRTY_SUFFIXES - - alias_method_chain :write_attribute, :dirty - alias_method_chain :save, :dirty - alias_method_chain :save!, :dirty - alias_method_chain :update, :dirty - alias_method_chain :reload, :dirty - - superclass_delegating_accessor :partial_updates - self.partial_updates = true - end - - # Do any attributes have unsaved changes? - # person.changed? # => false - # person.name = 'bob' - # person.changed? # => true - def changed? - !changed_attributes.empty? - end - - # List of attributes with unsaved changes. - # person.changed # => [] - # person.name = 'bob' - # person.changed # => ['name'] - def changed - changed_attributes.keys - end - - # Map of changed attrs => [original value, new value]. - # person.changes # => {} - # person.name = 'bob' - # person.changes # => { 'name' => ['bill', 'bob'] } - def changes - changed.inject({}) { |h, attr| h[attr] = attribute_change(attr); h } - end - - # Attempts to +save+ the record and clears changed attributes if successful. - def save_with_dirty(*args) #:nodoc: - if status = save_without_dirty(*args) - changed_attributes.clear - end - status - end - - # Attempts to <tt>save!</tt> the record and clears changed attributes if successful. - def save_with_dirty!(*args) #:nodoc: - status = save_without_dirty!(*args) - changed_attributes.clear - status - end - - # <tt>reload</tt> the record and clears changed attributes. - def reload_with_dirty(*args) #:nodoc: - record = reload_without_dirty(*args) - changed_attributes.clear - record - end - - private - # Map of change <tt>attr => original value</tt>. - def changed_attributes - @changed_attributes ||= {} - end - - # Handle <tt>*_changed?</tt> for +method_missing+. - def attribute_changed?(attr) - changed_attributes.include?(attr) - end - - # Handle <tt>*_change</tt> for +method_missing+. - def attribute_change(attr) - [changed_attributes[attr], __send__(attr)] if attribute_changed?(attr) - end - - # Handle <tt>*_was</tt> for +method_missing+. - def attribute_was(attr) - attribute_changed?(attr) ? changed_attributes[attr] : __send__(attr) - end - - # Handle <tt>*_will_change!</tt> for +method_missing+. - def attribute_will_change!(attr) - changed_attributes[attr] = clone_attribute_value(:read_attribute, attr) - end - - # Wrap write_attribute to remember original attribute value. - def write_attribute_with_dirty(attr, value) - attr = attr.to_s - - # The attribute already has an unsaved change. - if changed_attributes.include?(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. - write_attribute_without_dirty(attr, value) - end - - def update_with_dirty - if partial_updates? - # Serialized attributes should always be written in case they've been - # changed in place. - update_without_dirty(changed | self.class.serialized_attributes.keys) - else - update_without_dirty - end - end - - def field_changed?(attr, old, value) - if column = column_for_attribute(attr) - if column.number? && column.null && (old.nil? || old == 0) && value.blank? - # 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) - value = nil - else - value = column.type_cast(value) - end - end - - old != value - end - - module ClassMethods - def self.extended(base) - class << base - alias_method_chain :alias_attribute, :dirty - end - end - - def alias_attribute_with_dirty(new_name, old_name) - alias_attribute_without_dirty(new_name, old_name) - DIRTY_SUFFIXES.each do |suffix| - module_eval <<-STR, __FILE__, __LINE__+1 - def #{new_name}#{suffix}; self.#{old_name}#{suffix}; end # def subject_changed?; self.title_changed?; end - STR - end - end - end - end -end |