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URUG Ruby on Rails Workshop - Sesssion 5
- 1. Ruby on Rails Workshop Brad Midgley
- 2. About me • U of U grad • U of Colorado at Colorado Springs • Worked in Linux--Turbolinux • Worked in Java--U of U • Rails/iPhone--Surgeworks
- 3. This is not a toy
- 4. Neither is Rails • Programmers choose and enjoy it • Huge collaboration benefit • Open-source, freedom in license • Inspiring other frameworks/languages
- 5. More Data Handling • Using git • Filtering at the model • Sorting, driven by UI • Filtering at the UI, search
- 6. Workshop up • Project up-to-date • Some data, user account • Using/watching server log • Launching console, interacting with app
- 7. Named scopes • Spoiler? • Enhancing the model • Specify a subset of all rows • Named scopes can be efficiently combined
- 8. Simple example named_scope :family_friendly, :conditions => “rating in (‘G’, ‘PG’)” Movie.family_friendly Movie.family_friendly.all(:order => :genre) Movie.family_friendly.all(:conditions => {:genre => 'Comedy'})
- 9. Create your own • Think of a subset of users or movies • Implement in app/models/*.rb • Test using console • Combine filters
- 10. Click-to-sort columns • Very common to use ajax • Often using a plugin • A simple approach to start with
- 11. Non-ajax colsort • http://garbageburrito.com/blog/entry/447/ rails-super-cool-simple-column-sorting • View renders an action with parameters to initiate sort • Model watches for the parameters
- 12. Limitations? • Doesn’t indicate sort order • We’re not handling paging, will complicate it • Let’s fix the first one
- 13. Sort order icon • Poach up and down triangles • No triangle if not sorting on this column • Appropriate triangle for sort order • Where does this code go?
- 14. Search • Search on title for now • UI component • Server filter component
- 15. A special form • Normally forms post • Search has no side effects • Search should be bookmarkable • Make it a get, re-use the action we are on
- 16. Form front <% form_tag(movies_path, :method => "get") do %> <%= text_field_tag(:s) %> <%= submit_tag("Search", :name => nil) %> <% end %>
- 17. Form handler • Watch params[:s] • Try to keep existing code from today • Remember we are passing a hash • Implement this in controllers/ movie_controller.rb • Modify the result set in @movies • GO
- 18. Hints
- 19. Hints • :conditions => ['title like ?', "%#{params[:s]}%"]
- 20. Hints • :conditions => ['title like ?', "%#{params[:s]}%"] • overlay with :order => ...
- 21. Hints • :conditions => ['title like ?', "%#{params[:s]}%"] • overlay with :order => ... • Construct a hash with only the :order and optionally add the :conditions => ...