RoR 101: Session 6
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The document discusses setting up authentication for a Rails application using Devise, implementing the asset pipeline to concatenate and compress CSS and JavaScript assets, adding AJAX functionality through remote links and JavaScript responses, handling orphaned dependent objects, and creating a view helper to display Gravatar images for user emails. It provides an overview of key aspects of building a Rails application with user authentication, assets, and AJAX interactions.
RoR 101: Session 6
- 1. Building Web Apps with Rails VI
- 2. Session 5 Recap ● User Model ● Installing Gems with Bundler ● Authentication with Devise
- 3. Session 5: Authentication At present, anyone can CRUD (Create Read Update Destroy) Signed in Users Public
- 5. Session 6: Stocking Fillers... More on Assets AJAX Orphans! Your very own view helper
- 6. The Asset Pipeline NEW in Rails 3.1! “A framework to concatenate and minify or compress JavaScript and CSS assets.” Also, enables CoffeeScript, Sass and ERB for assets.
- 7. Pre-Processing in Assets Asset helpers are available e.g. .class { backgroundimage: url(<%= asset_path 'image.png' %>) }
- 8. The Asset Pipeline: Locations app/assets – your app's assets vendor/assets – not maintained by you lib/assets - maintained by you but not app specific public/ – old skool static location
- 9. What assets do we have? Rails.application.config.assets.paths Shows assets available to application including stuff in gems.
- 10. JS Assets Go to: 127.0.0.1:3000/assets/application.js In assets/application.js: //= require jquery //= require jquery_ujs //= require_tree . This is a sprockets manifest file.
- 11. CSS Assets Go to: 127.0.0.1:3000/assets/application.css In assets/application.css: // *= require_self // *= require_tree .
- 13. AJAX: Step 1 Add :remote => true to link_to 'Destroy', station, confirm: 'Are you sure?', :method => :delete
- 14. AJAX: Step 2 Add id to element in view <tr id = "station_<%= station.id %>"> Respond to javascript in controller respond_to do |format| format.html { redirect_to stations_url } format.js end
- 15. AJAX: Step 3 Keep id of the station to be removed. @remove_id = @station.id Define your response javascript: destroy.js.erb $('#station_<%= @remove_id %>').fadeOut();
- 16. Orphans! It's nearly Christmas, we should help...
- 18. Orphans! In station.rb: has_many :streams, :dependent => :destroy
- 19. Your Own View Helpers A Globally Recognized Avatar
- 20. Helper Files These can be found in “firstfm/app/helpers” Are included depending on controller.
- 21. Adding a Gravatar Helper require 'digest/md5' def gravatar_url_for(email) return "http://www.gravatar.com/avatar.php ?gravatar_id= #{Digest::MD5::hexdigest(email)}" end
- 22. Helper: Now use it in your view! Task! Using <%= gravatar_url_for(email) %> Display the gravatar for the currently logged in user!