Beyond the Rails Way

As Rails applications grow, maintainability and testability becomes a real challenge. It is time to move beyond the Rails Way and explore new ways to organize your application.

Transcript

1. michelada.io Beyond of Rails Way Mario Alberto Chávez @mario_chavez
2. michelada.io
3. michelada.io Controller View Model MVC
4. michelada.io Fat Controllers, Obese Models
5. michelada.io Hard to read, hard to follow, hard to change
6. michelada.io Models on diet
7. michelada.io Scopes
8. michelada.io scope :active -> { where(status: :active) }
9. michelada.io scope :active -> { where(status: :active) }
 scope :with_orders -> { includes(:orders) } scope :ordered -> { order(created_at: :desc) } @products = Product. active. with_orders. ordered. where(color: :red)
10. michelada.io Query Objects
11. michelada.io class ProductQuery def self.execute(scope: Product, *params)
 …
 end
 # more complex logic
 … 
 end @products = ProductQuery.execute(
 ordered: true, with_orders: true )
12. michelada.io Concerns
13. michelada.io class Product < ApplicationRecord include Flaggable include Taggable include Conflictable include Measurable include Sanitizable include Searchable include Permisionable end
 
 Product.methods(false).count #=> 161
14. michelada.io Actions
15. michelada.io class ProductPermissions def self.can_save?(product:, user:) … end # more methods related to permissions … end if ProductPermissions.can_save?(@product, @me) … end
16. michelada.io Presenters
17. michelada.io class ProductPresenter < SimpleDelegator def formatted_price … end end @presenter = ProductPresenter.new(@product) <%= @presenter.formatted_price %>
18. michelada.io De-chubby controllers
19. michelada.io Use QueryObjects and Presenters!
20. michelada.io Complex Logic in your actions
21. michelada.io class ProductsController < ApplicationController def create …
 if @product.valid?
 return redirect_to …
 end
 return render :new
 … end end
22. michelada.io class ProductsController < ApplicationController …
 # Many before_actions
 …
 # Many helper_method
 …
 # Many queries end
23. michelada.io Use cases
24. michelada.io class ProductRegistrator def register(*params) …
 # complex logic and calculations … @product end end
25. michelada.io class ProductsController < ApplicationController def create product_registrator = ProductRegistrator.new(product_params) @product = product_registrator.register end end
26. michelada.io Side effects: Reduce ActiveRecord callbacks
27. michelada.io Everything slim and testable
28. michelada.io - app - models - controllers - views - presenters - queries - actions - use_cases
29. michelada.io Thanks! Mario Alberto Chávez @mario_chavez