Adding presenters for question/support pages

Replacing hack that generated the questions/supports pages
with presenters. View now delegates all logic to presenters.
Which presenter is used is determined by controller.

app/controllers/questions_controller.rb

@@ -1,6 +1,7 @@
 class QuestionsController < InheritedController
-  before_filter :set_support
   load_and_authorize_resource
+  prepend_before_filter :set_presenter
+  prepend_before_filter :set_support
 
   def create
     @question = Question.create params[:question]
@@ -18,22 +19,31 @@ def update
   end
 
   def collection
-    if @support
-      @questions ||= end_of_association_chain.supports.newest_first.paginate(:page => params[:page])
-    else
-      @questions ||= end_of_association_chain.no_supports.newest_first.paginate(:page => params[:page])
-    end
+    @questions = @presenter.apply_scope(end_of_association_chain).newest_first.paginate(:page => params[:page])
   end
-  
+
   def collection_url
-    @support ? support_questions_path : questions_path
+    collection_path
   end
+
+  def collection_path
+    @presenter.collection_path
+  end
+
   def new_resource_path
-    @support ? new_support_question_path : new_question_path
+    @presenter.new_resource_path
+  end
+
+  def resource_url(*params)
+    resource_path(params)
   end
 
-  def resource_path(*resource)
-    @support ? support_question_path(*resource) : question_path(*resource)
+  def resource_path(*other)
+    if other[0]
+      @presenter.resource_path(other)
+    else
+      @presenter.resource_path(resource)
+    end
   end
 
   def edit_resource_path
@@ -47,4 +57,12 @@ def set_support
     end
   end
 
+  def set_presenter
+    if @support
+      @presenter = SupportPresenter.new(resource)
+    else
+      @presenter = QuestionPresenter.new(resource)
+    end
+  end
+
 end

app/presenters/question_presenter.rb

@@ -0,0 +1,35 @@
+class QuestionPresenter
+  include Rails.application.routes.url_helpers
+
+  def initialize(q)
+    @question = q
+  end
+
+  def resource_path(question)
+    if question
+      question_path(question)
+    else
+      question_path(@question)
+    end
+  end
+
+  def new_resource_path
+    new_question_path
+  end
+
+  def collection_path
+    questions_path
+  end
+
+  def edit_resource_path
+    edit_question_path
+  end
+
+  def apply_scope(chain)
+    chain.no_supports
+  end
+
+  def answers_path
+    question_answer_path(@question)
+  end
+end

app/presenters/support_presenter.rb

@@ -0,0 +1,35 @@
+class SupportPresenter
+  include Rails.application.routes.url_helpers
+
+  def initialize(sq)
+    @support_question = sq
+  end
+
+  def page_title
+    "Support Questions"
+  end
+
+  def new_resource_path
+    new_support_question_path
+  end
+
+  def collection_path
+    support_questions_path
+  end
+
+  def edit_resource_path
+    edit_support_question_path
+  end
+
+  def resource_path(question)
+    if question
+      support_question_path(question)
+    else
+      support_question_path(@question)
+    end
+  end
+
+  def apply_scope(chain)
+    chain.supports
+  end
+end

app/views/questions/_form.html.haml

@@ -1,5 +1,4 @@
-- curr_module = @support ? '/support' : ''
-= simple_form_for(resource, :url => curr_module.concat(@form_url)) do |f|
+= simple_form_for(resource, :url => @form_url) do |f|
   = f.error_notification
 
   .inputs

app/views/shared/_ask.html.haml

@@ -2,7 +2,7 @@
   %h2 Have A Question?
   %p Ask away! No question is too big or too small.
   - if current_user
-    = link_to "Ask a Question", new_question_path, :class => "btn success"
+    = link_to "Ask a Question", new_resource_path, :class => "btn success"
   - else
     %p Log in to ask a question
     = link_to "Log In", login_path, :class => "btn success"