week5_day4_lecture_notes.md

Topics covered

• Review of Rails Scopes & Namespacing

   namespace :admin do
       resources :reviews, only: [:index]
   end

  which is synonomous with...

  scope '/admin', as: 'admin' do
      resources :reviews, only: [:index]
  end

• Refresher on query modifiers * offset and limit * order * distinct * group * group(...).having(...)

• Scopes * named scopes with lambda blocks * Lambda blocks are anonymous methods * scope chaining * default scope * unscope / unscoped / reorder -> Remove parts of a scope when needed

• Shortcuts

  • Model.find_or_create_by
  • Model.find_or_initialize_by (= Model.find + Model.new)