Fixed some department bugs

.gitignore

@@ -22,4 +22,5 @@ examples.rb
 json_responses.txt
 
 *.swp
-token.rb
+helper.rb
+test

lib/pcr.rb

@@ -27,7 +27,7 @@ def instructor(id)
  raise NotImplementedError.new("Instructors have not yet been implemented.")
  end
 
- def dept(code)
+ def department(code)
  Department.new code
  end
  end

lib/pcr/coursehistory.rb

@@ -53,6 +53,8 @@ def average(metric)
  end
  end
  end
+
+ return -1 if num == 0
 
  # Return average value across all sections
  total / num

lib/pcr/department.rb

@@ -6,7 +6,7 @@ class Department
  include PCR::Resource
  attr_reader :name, :coursehistories, :id, :path, :retrieved, :valid, :version
 
- def initialize(course_code)
+ def initialize(name)
  @name = name
 
  # Read JSON from PCR API
@@ -26,8 +26,11 @@ def average(metric)
  # Aggregate ratings across all coursehistories
  total, num = 0, 0
  coursehistories.each do |c|
- total += c.average(metric).to_f
- num += 1
+ av = c.average(metric).to_f
+ if av != -1
+ total += av
+ num += 1
+ end
  end
 
  # Return average value across all sections