Pie chart on how recruits evaluated documentation on questions how pages

Charts are shown only to recruiters on questions show pages, but other
users may view charts directly (by entering URL manually).

5 files changed, 47 insertions, 0 deletions

diff --git a/app/controllers/questions_controller.rb b/app/controllers/questions_controller.rb
index ae35065..0e1ba3c 100644
--- a/app/controllers/questions_controller.rb
+++ b/app/controllers/questions_controller.rb
@@ -30,4 +30,7 @@ class QuestionsController < ApplicationController
   def approve_questions
     hobo_index Question.questions_to_approve
   end
+
+  show_action :doc_feedback_chart
+
 end
diff --git a/app/models/answer.rb b/app/models/answer.rb
index f013547..47544b3 100644
--- a/app/models/answer.rb
+++ b/app/models/answer.rb
@@ -47,6 +47,11 @@ class Answer < ActiveRecord::Base
   named_scope   :in_category, lambda { |category| {
     :joins => :question, :conditions => { 'questions.question_category_id', category} } }
 
+  named_scope   :with_feedback, lambda { |opt| {
+    :conditions => { :feedback => opt } } }
+
+  named_scope   :with_some_feedback, :conditions => "answers.feedback IS NOT NULL AND answers.feedback <> ''"
+
   validates_uniqueness_of :question_id, :scope => :reference, :if => :reference
   validates_uniqueness_of :question_id, :scope => :owner_id, :unless => :reference
 
diff --git a/app/models/question.rb b/app/models/question.rb
index 084f826..294e03e 100644
--- a/app/models/question.rb
+++ b/app/models/question.rb
@@ -160,6 +160,26 @@ class Question < ActiveRecord::Base
   after_create  :notify_new_question
   after_update  :notify_approved_question
 
+  # Returns hash with:
+  #  :values - string with coma-separated values
+  #  :labels - string with coma-separated, quoted labels for values
+  def feedback_chart_data
+    classes = Answer.new.feedback.class.values - ['']
+    delta   = 0.00001
+    result  = {}
+    counts  = classes.collect{ |opt| answers.with_feedback(opt).count }
+
+    result[:values] = counts.inject(nil) do |res, cur|
+      res.nil? ? (cur + delta).to_s : "#{res}, #{cur + delta}"
+    end
+
+    result[:labels] = classes.inject(nil) do |res, cur|
+      res.nil? ? "\"%%.%% - #{cur} (##)\"" : "#{res}, \"%%.%% - #{cur} (##)\""
+    end
+
+    result
+  end
+
   protected
     # Sends notification about new question (TODO: check for group).
     def notify_new_question
diff --git a/app/views/questions/doc_feedback_chart.dryml b/app/views/questions/doc_feedback_chart.dryml
new file mode 100644
index 0000000..1a02c45
--- /dev/null
+++ b/app/views/questions/doc_feedback_chart.dryml
@@ -0,0 +1,16 @@
+<page>
+  <head:>
+    <javascript name='raphael'/>
+    <javascript name='g.raphael-min'/>
+    <javascript name='g.pie-min'/>
+  </head:>
+  <body:>
+    <script type="text/javascript" charset="utf-8">
+      var r = Raphael(0, 0, 600, 600);
+      <%=
+        dat = this.feedback_chart_data
+        "r.g.piechart(300, 300, 200, [#{dat[:values]}], {legend: [#{dat[:labels]}], legendpos: \"north\"});"
+        %>
+      </script>
+  </body:>
+</page>
diff --git a/app/views/questions/show.dryml b/app/views/questions/show.dryml
index 2e30578..8cb6629 100644
--- a/app/views/questions/show.dryml
+++ b/app/views/questions/show.dryml
@@ -26,5 +26,8 @@
       <br/>
       <a href="&answer_path(this.reference_answer)">View reference answer</a>.
     </if>
+    <if test="&current_user.try.role.try.is_recruiter? && this.answers.with_some_feedback.count > 0">
+      <iframe src="<%= question_doc_feedback_chart_path(this.id) %>" width="600" height="600"/>
+    </if>
   </content-body:>
 </show-page>