Active Record Internals - Medellin.rb
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The document discusses an upcoming Medellín.rb meetup focused on ActiveRecord internals. The schedule includes introducing the Active Record pattern, an overview of ActiveRecord as implemented in Rails, and a code kata exercise to implement basic ActiveRecord methods like .first, .all, and .find_by. It provides background readings and links on architectural patterns, Active Record pattern, and the Rails ActiveRecord basics guide.
Active Record Internals - Medellin.rb
- 2. Schedule - Say Hi - Active Record Pattern - ActiveRecord (Rails) - Yummy yummy - Code Kata @RubyMedellin http://medellinrb.org
- 5. Ruby Patterns http://www.amazon.com/Design-Patterns-Ruby-Russ-Olsen/dp/0321490452/
- 6. Active Record Pattern An object that wraps a row in a database table or view, encapsulates the database access, and adds domain logic on that data. http://www.martinfowler.com/eaaCatalog/activeRecord.html
- 7. ActiveRecord (Rails) Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database. It is an implementation of the Active Record pattern which itself is a description of an Object Relational Mapping system. http://guides.rubyonrails.org/active_record_basics.html
- 8. ActiveRecord (Rails) - ActiveModel - Migrations - Adapters - Validations - Callbacks - etc http://guides.rubyonrails.org/active_record_basics.html
- 9. ActiveRecord (Rails) class Product < ActiveRecord::Base # ... end Product.first Product.where(name: ‘LCD TV’) http://guides.rubyonrails.org class CreateProducts < ActiveRecord::Migration def change create_table :products do |t| t.string :name t.text :description t.timestamps null: false end end end
- 10. DEMO Code will be uploaded to: https://github.com/medellinrb/activerecord-internals
- 11. Yummy yummy
- 12. Code Kata
- 13. Code Kata Kata (型 or 形 literally: "form"? ), a Japanese word, are the detailed choreographed patterns of movements practised either solo or in pairs. A code kata is an exercise in programming which helps a programmer hone their skills through practice and repetition. http://en.wikipedia.org/wiki/Kata_(programming) - http://en.wikipedia.org/wiki/Kata
- 14. Today’s Kata Implement: SomeModel.first SomeModel.all SomeModel.count SomeModel.find_by_name(‘given name’) SomeModel.find_by_whateverattribute(‘xxx’) SomeModel.where(attr: ‘value’) Improve multiple DB adapters Improve setup/teardown on tests