gorillib model active_model support

gorillib/model -- active_model integration

• direct copy of (some) ActiveModel pieces, but without the requires.

create active_model_lite, an upward-compatible bowdlerization of the active_model suite. You include exactly one of them.

• direct from ActiveModel:
  • ActiveModel::Errors
  • ActiveModel::Translation

1. attribute_methods -- no
2. callbacks -- from active_model
3. configuration -- no
4. conversion -- by us
5. dirty -- by us
6. errors -- from active_model
7. lint -- from active_model
8. locale -- ??
9. mass_assignment_security -- ??
10. model -- no
11. naming -- by us; uses pluggable inflections (with stupider inflector by default)
12. observer_array -- no
13. observing -- no
14. railtie -- no
15. secure_password -- no
16. serialization -- from active_model; overrides read_attribute_for_serialization, sets associations
17. serializers -- from active_model
18. translation -- from active_model
19. validations -- from active_model; can reshape to omit dependencies on translation, configuration
20. validator -- from active_model
21. version --

a1. descendants_tracker -- from active_support

Directly: conversion, naming, dirty Yes: callbacks, errors, lint, serialization/serializers, validations/validators No: attribute_methods, configuration, locale, mass_assignment_security, observing/observer_array, railtie, secure_password, translation

Dirty

• include ActiveModel::Dirty in your object

• Call define_attribute_methods passing each method you want to track

• Call attr_name_will_change! before each change to the tracked attribute

• If you wish to also track previous changes on save or update, add @previously_changed = changes inside of your save or update method.

• A minimal implementation could be:

  ```ruby
  class Person
    include ActiveModel::Dirty
    define_attribute_methods [:name]
  
    def name() @name ; end
    def name=(val)
      name_will_change! unless val == @name
      @name = val
    end
    def save
      @previously_changed = changes
      @changed_attributes.clear
    end
  end
  ```
  

Errors

can come across fairly directly.

• to call to_xml, you must provide Array#to_xml yourself.