2009/9/4 Ar Chron <[email protected]>:
>
> I'm sure there's a better way (I haven't fiddled with named_scope before
> this evening) but:
>
> class Participation < ActiveRecord::Base
> belongs_to :user
> belongs_to :sandbox
> named_scope :who_are_admins, :conditions => ['role = ?', 'admin']
> named_scope :who_are_users, :conditions => ['role = ?', 'user']
> named_scope :who_are_donkeys, :conditions => ['role = ?', 'donkey']
If you want a parameterised named_scope you can use
named_scope :by_role, lambda { |role| { :conditions => ['role = ?', role] }
then you can say participations.by_role( 'donkey' )
Colin
> end
>
> class Sandbox < ActiveRecord::Base
> validates_presence_of :name
> has_many :participations
> has_many :users, :through => :participations
> # just to see what the show syntax would look like
> def donkeys
> self.participations.who_are_donkeys
> end
> def admins
> self.participations.who_are_admins
> end
> end
>
> And the show.html.erb
>
> <p>
> <b>Name:</b>
> <%=h @sandbox.name %>
> </p>
> <p><b>Users (:through)</b><br/>
> <% @sandbox.users.each do |user| %>
> <%=h user.first+' '+user.last %><br/>
> <% end %>
> </p>
> <p><b>Admins:</b><br/>
> <% @sandbox.participations.who_are_admins.each do |admin| %>
> <%=h admin.user.first+' '+admin.user.last %><br/>
> <% end %>
> </p>
> <p><b>Users:</b><br/>
> <% @sandbox.participations.who_are_users.each do |user| %>
> <%=h user.user.first+' '+user.user.last %><br/>
> <% end %>
> </p>
> <p><b>Donkeys:</b><br/>
> <% @sandbox.participations.who_are_donkeys.each do |donkey| %>
> <%=h donkey.user.first+' '+donkey.user.last %><br/>
> <% end %>
> </p>
> <p><b>Donkeys (sandbox method form):</b><br/>
> <% @sandbox.donkeys.each do |donkey| %>
> <%=h donkey.user.first+' '+donkey.user.last %><br/>
> <% end %>
> </p>
Colin
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