diff options
Diffstat (limited to 'activemodel/lib/active_model/dirty.rb')
| -rw-r--r-- | activemodel/lib/active_model/dirty.rb | 133 |
1 files changed, 106 insertions, 27 deletions
diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb index ecb7a9e9b1..4e389c8692 100644 --- a/activemodel/lib/active_model/dirty.rb +++ b/activemodel/lib/active_model/dirty.rb @@ -1,5 +1,6 @@ require 'active_support/hash_with_indifferent_access' require 'active_support/core_ext/object/duplicable' +require 'active_support/core_ext/string/filters' module ActiveModel # == Active \Model \Dirty @@ -14,13 +15,10 @@ module ActiveModel # track. # * Call <tt>attr_name_will_change!</tt> before each change to the tracked # attribute. - # - # If you wish to also track previous changes on save or update, you need to - # add: - # - # @previously_changed = changes - # - # inside of your save or update method. + # * Call <tt>changes_applied</tt> after the changes are persisted. + # * Call <tt>clear_changes_information</tt> when you want to reset the changes + # information. + # * Call <tt>restore_attributes</tt> when you want to restore previous data. # # A minimal implementation could be: # @@ -39,14 +37,25 @@ module ActiveModel # end # # def save - # @previously_changed = changes - # @changed_attributes.clear + # # do persistence work + # + # changes_applied + # end + # + # def reload! + # # get the values from the persistence layer + # + # clear_changes_information + # end + # + # def rollback! + # restore_attributes # end # end # # A newly instantiated object is unchanged: # - # person = Person.find_by_name('Uncle Bob') + # person = Person.find_by(name: 'Uncle Bob') # person.changed? # => false # # Change the name: @@ -54,6 +63,7 @@ module ActiveModel # person.name = 'Bob' # person.changed? # => true # person.name_changed? # => true + # person.name_changed?(from: "Uncle Bob", to: "Bob") # => true # person.name_was # => "Uncle Bob" # person.name_change # => ["Uncle Bob", "Bob"] # person.name = 'Bill' @@ -65,6 +75,19 @@ module ActiveModel # person.changed? # => false # person.name_changed? # => false # + # Reset the changes: + # + # person.previous_changes # => {"name" => ["Uncle Bob", "Bill"]} + # person.reload! + # person.previous_changes # => {} + # + # Rollback the changes: + # + # person.name = "Uncle Bob" + # person.rollback! + # person.name # => "Bill" + # person.name_changed? # => false + # # Assigning the same value leaves the attribute unchanged: # # person.name = 'Bill' @@ -77,9 +100,11 @@ module ActiveModel # person.changed # => ["name"] # person.changes # => {"name" => ["Bill", "Bob"]} # - # If an attribute is modified in-place then make use of <tt>[attribute_name]_will_change!</tt> - # to mark that the attribute is changing. Otherwise ActiveModel can't track - # changes to in-place attributes. + # If an attribute is modified in-place then make use of + # +[attribute_name]_will_change!+ to mark that the attribute is changing. + # Otherwise Active Model can't track changes to in-place attributes. Note + # that Active Record can detect in-place modifications automatically. You do + # not need to call +[attribute_name]_will_change!+ on Active Record models. # # person.name_will_change! # person.name_change # => ["Bill", "Bill"] @@ -91,7 +116,8 @@ module ActiveModel included do attribute_method_suffix '_changed?', '_change', '_will_change!', '_was' - attribute_method_affix :prefix => 'reset_', :suffix => '!' + attribute_method_affix prefix: 'reset_', suffix: '!' + attribute_method_affix prefix: 'restore_', suffix: '!' end # Returns +true+ if any attribute have unsaved changes, +false+ otherwise. @@ -119,7 +145,7 @@ module ActiveModel # person.name = 'bob' # person.changes # => { "name" => ["bill", "bob"] } def changes - HashWithIndifferentAccess[changed.map { |attr| [attr, attribute_change(attr)] }] + ActiveSupport::HashWithIndifferentAccess[changed.map { |attr| [attr, attribute_change(attr)] }] end # Returns a hash of attributes that were changed before the model was saved. @@ -129,7 +155,7 @@ module ActiveModel # person.save # person.previous_changes # => {"name" => ["bob", "robert"]} def previous_changes - @previously_changed + @previously_changed ||= ActiveSupport::HashWithIndifferentAccess.new end # Returns a hash of the attributes with unsaved changes indicating their original @@ -139,14 +165,48 @@ module ActiveModel # person.name = 'robert' # person.changed_attributes # => {"name" => "bob"} def changed_attributes - @changed_attributes ||= {} + @changed_attributes ||= ActiveSupport::HashWithIndifferentAccess.new + end + + # Handle <tt>*_changed?</tt> for +method_missing+. + def attribute_changed?(attr, options = {}) #:nodoc: + result = changed_attributes.include?(attr) + result &&= options[:to] == __send__(attr) if options.key?(:to) + result &&= options[:from] == changed_attributes[attr] if options.key?(:from) + result + end + + # Handle <tt>*_was</tt> for +method_missing+. + def attribute_was(attr) # :nodoc: + attribute_changed?(attr) ? changed_attributes[attr] : __send__(attr) + end + + # Restore all previous data of the provided attributes. + def restore_attributes(attributes = changed) + attributes.each { |attr| restore_attribute! attr } end private - # Handle <tt>*_changed?</tt> for +method_missing+. - def attribute_changed?(attr) - changed_attributes.include?(attr) + # Removes current changes and makes them accessible through +previous_changes+. + def changes_applied # :doc: + @previously_changed = changes + @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new + end + + # Clear all dirty data: current changes and previous changes. + def clear_changes_information # :doc: + @previously_changed = ActiveSupport::HashWithIndifferentAccess.new + @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new + end + + def reset_changes + ActiveSupport::Deprecation.warn(<<-MSG.squish) + `#reset_changes` is deprecated and will be removed on Rails 5. + Please use `#clear_changes_information` instead. + MSG + + clear_changes_information end # Handle <tt>*_change</tt> for +method_missing+. @@ -154,11 +214,6 @@ module ActiveModel [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) return if attribute_changed?(attr) @@ -169,15 +224,39 @@ module ActiveModel rescue TypeError, NoMethodError end - changed_attributes[attr] = value + set_attribute_was(attr, value) end # Handle <tt>reset_*!</tt> for +method_missing+. def reset_attribute!(attr) + ActiveSupport::Deprecation.warn(<<-MSG.squish) + `#reset_#{attr}!` is deprecated and will be removed on Rails 5. + Please use `#restore_#{attr}!` instead. + MSG + + restore_attribute!(attr) + end + + # Handle <tt>restore_*!</tt> for +method_missing+. + def restore_attribute!(attr) if attribute_changed?(attr) __send__("#{attr}=", changed_attributes[attr]) - changed_attributes.delete(attr) + clear_attribute_changes([attr]) end end + + # This is necessary because `changed_attributes` might be overridden in + # other implemntations (e.g. in `ActiveRecord`) + alias_method :attributes_changed_by_setter, :changed_attributes # :nodoc: + + # Force an attribute to have a particular "before" value + def set_attribute_was(attr, old_value) + attributes_changed_by_setter[attr] = old_value + end + + # Remove changes information for the provided attributes. + def clear_attribute_changes(attributes) # :doc: + attributes_changed_by_setter.except!(*attributes) + end end end |