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Listing 6-26. Updated app/models/event.rb
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class Event < ActiveRecord::Base belongs_to :user has_many :registrations has_many :attendees, :through => :registrations, :source => :user has_and_belongs_to_many :categories validates_presence_of :title, :location after_create :ensure_owner_attends validate :has_not_occurred def is_in_the_past occurs_on < Date.today end def long_title "#{title} - #{location} - #{occurs_on}" end def owned_by (owner) return false unless owner.is_a User user == owner end protected def ensure_owner_attends unless attendees.include user attendees << user end end
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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def has_not_occurred errors.add("occurs_on", "is in the past") if occurs_on && is_in_the_past end end
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Now let s make use of this method in the _event partial by adding links to edit or delete an event only if it s owned by the currently logged-in user, as shown in Listing 6-27.
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Listing 6-27. Links Added in app/views/events/_event.rhtml
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<% if event.owned_by current_user %> <p> <%= link_to 'edit', edit_event_url(event) %> | <%= link_to('delete', {:action => 'destroy', :id => event}, :method => 'delete', :confirm => 'Really ') %> </p> <% end %>
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The final event partial is show in Listing 6-28.
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Listing 6-28. Complete Event Partial in app/views/events_event/rhtml
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<div class="event item"> <h3 class="title"><%= link_to h(event.title), event_url(event) %></h3> <% if event.owned_by current_user %> <p> <%= link_to 'edit', edit_event_url(event) %> | <%= link_to('delete', {:action => 'destroy', :id => event}, :method => 'delete', :confirm => 'Really ') %> </p> <% end %> <ul> <li><%=h event.occurs_on %></li> <li><%=h event.location %></li> </ul> <div class="description"> <%= simple_format(sanitize(event.description)) %> </div> </div>
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
Adding Custom Helpers
Our events application is looking pretty good, but we would like to make it a bit more user-friendly. One thing we can do is add helpful cancel links beside each of the submit buttons on the forms, so that it s possible for users to back out of editing. We could do this by adding link_to helpers beside each button, but then we would need to do this for every form. Since we ll probably want to repeat this pattern throughout the application, this could end up being a lot of duplication. Why don t we create our own custom helper to do this for us Listing 6-29 shows the method submit_tag_or_cancel added to the application_helper.
Listing 6-29. The app/helpers/application_helper.rb File
module ApplicationHelper # Creates a submit button with the given name with a cancel link # Accepts a hash of options in url_for format to create the cancel link def submit_tag_or_cancel(name, options={}) options = 'javascript:history.go(-1);' if options.empty "#{submit_tag(name)} or #{link_to 'Cancel', options, :class => 'cancel' }" end end
Now let s use this helper on our forms. Open both the new and edit templates and update them so they look like Listings 6-30 and 6-31.
Listing 6-30. Updated app/views/events/new.rhtml
<h1>New event</h1> <% form_tag :action => 'create' do %> <%= render :partial => 'form' %> <%= submit_tag_or_cancel "Create" %> <% end %>
Listing 6-31. Updated app/views/events/edit.rhtml
<h1>Editing event</h1> <% form_tag :action => 'update', :id => @event do %> <%= render :partial => 'form' %> <%= submit_tag_or_cancel 'Save Changes' %> <% end %>
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
Giving It Some Style
Our events application could use a little varnish. We ll update the layout, apply a style sheet, and add a helper that will make it possible to highlight the tab the user has selected.
Updating the Layout
Let s update the main layout and add in some style hooks that we can target via CSS, as shown in Listing 6-32.
Listing 6-32. Updated app/views/layouts/application.rhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Events</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <%= stylesheet_link_tag 'application' %> <%= javascript_include_tag :defaults %> </head> <body> <div id="application"> <div id="header"> <div class="container"> <div class="statusbar"> <div class="logo"> <strong>Eventalicious!</strong> </div> <div class="menu"> <% if logged_in %> logged in as: <%= current_user.login %> (<%= link_to 'logout', logout_url %>) <% else -%> <%= link_to 'signin', login_url %> <% end -%> </div> </div> <br style="clear:both;" /> <div class="tabs">
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
<ul class="navigation"> <li> <%= link_to('Events', events_url) %> </li> <% if logged_in %> <li> <%= link_to('New Event', new_event_url) </li> <% end -%> </ul> </div> </div> </div> <div id="page"> <div id="content"> <% if flash[:notice] %> <div class="flash"><%= flash[:notice] %></div> <% end -%> <%= yield %> </div> <hr /> </div> <div id="footer"></div> </div> </body> </html>
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