The Active Model

A brief introduction with examples to Rails Active Model library.

Transcript

1. THE ACTIVE MODEL THE ACTIVE MODEL THE ACTIVE MODEL THE ACTIVE MODEL THE ACTIvE MODEL THE ACTIVE MODEL_ POR: LUIS ALFREDO LORENZO A.K.A BABASBOT
2. BABASBOT
4. github.com/mxabierto
7. ACTIVE RECORD ACTIVE ReCORD ACTIVE RECCORD ACTIVE RECORD ACTIvE RECORD ACTIVE RECORD
8. ACTIVE REDCORD IS THE M IN MVC
9. OBJECT Relational Mapping SYSTEM RAILS
10. thE
 Active Record pattern
11. ACTIVE MODEL ACTIVE MODEL ACTIVE MODEL ACTIVE MODEL ACTIvE MODEL ACTIVE MODEL_
12. _WHY
 Active MODEL?
13. ActiveModel::AttributeMethods
14. class Pokemon include ActiveModel::AttributeMethods attr_accessor :hp attribute_method_prefix 'clear_' define_attribute_methods :hp def clear_attribute(attr) send("#{attr}=", 0) end end
15. class Pokemon include ActiveModel::AttributeMethods attr_accessor :level attribute_method_suffix '_highest?' define_attribute_methods :level private def attribute_highest?(attribute) send(attribute) >= 100 end end
16. ActiveModel::Callbacks
17. class Pokemon extend ActiveModel::Callbacks attr_accessor :level, :name define_model_callbacks :level_up around_level_up :evolve def level_up run_callbacks(:level_up) do self.level += 1 end end def evolve puts 'What? #{name} is evolving!' yield puts ‘#{name} has evolved into Raichu.' end end
18. ActiveModel::DIRTY
19. class Pokemon include ActiveModel::Dirty define_attribute_methods :level def level @level end def level=(val) level_will_change! unless val == @level @level = val end def save changes_applied end end
20. ActiveModel::VALIDATIONS
21. class Pokemon include ActiveModel::Validations attr_accessor :name validates :name, presence: true end
22. ActiveModel::NAMING
23. class Pokemon extend ActiveModel::Naming end
24. ActiveModel::MODEL
25. class Pokemon include ActiveModel::Model attr_accessor :name, :level, :hp validates :name, :level, :hp, presence: true end
27. THE END?