don't allow nil rubric titles

also fixup current rubrics with nil titles

test plan:
* should not be able to create a rubric with a nil title

closes #OUT-8

Change-Id: Ic58b0c6f513ad54e11fed1b95342be16f6fd6e3f
Reviewed-on: https://gerrit.instructure.com/88496
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>

app/models/importers/rubric_importer.rb

@@ -42,6 +42,7 @@ module Importers
         item.migration_id = hash[:migration_id]
         item.workflow_state = 'active' if item.deleted?
         item.title = hash[:title]
+        item.populate_rubric_title # just in case
         item.description = hash[:description]
         item.points_possible = hash[:points_possible].to_f
         item.read_only = hash[:read_only] unless hash[:read_only].nil?

app/models/rubric.rb

@@ -28,7 +28,7 @@ class Rubric < ActiveRecord::Base
 
   validates_presence_of :context_id, :context_type, :workflow_state
   validates_length_of :description, :maximum => maximum_text_length, :allow_nil => true, :allow_blank => true
-  validates_length_of :title, :maximum => maximum_string_length, :allow_nil => true, :allow_blank => true
+  validates_length_of :title, :maximum => maximum_string_length, :allow_nil => false, :allow_blank => false
 
   before_validation :default_values
   after_save :update_alignments
@@ -75,13 +75,19 @@ class Rubric < ActiveRecord::Base
   end
 
   def default_values
-    original_title = self.title
+    if Rails.env.test?
+      populate_rubric_title # there are too many specs to change and i'm too lazy
+    end
+
     cnt = 0
     siblings = Rubric.where(context_id: self.context_id, context_type: self.context_type).where("workflow_state<>'deleted'")
     siblings = siblings.where("id<>?", self.id) unless new_record?
-    while siblings.where(title: self.title).exists?
-      cnt += 1
-      self.title = "#{original_title} (#{cnt})"
+    if self.title.present?
+      original_title = self.title
+      while siblings.where(title: self.title).exists?
+        cnt += 1
+        self.title = "#{original_title} (#{cnt})"
+      end
     end
     self.context_code = "#{self.context_type.underscore}_#{self.context_id}" rescue nil
   end
@@ -211,6 +217,10 @@ class Rubric < ActiveRecord::Base
     false
   end
 
+  def populate_rubric_title
+    self.title ||= t('context_name_rubric', "%{course_name} Rubric", :course_name => context.name)
+  end
+
   CriteriaData = Struct.new(:criteria, :points_possible, :title)
   def generate_criteria(params)
     @used_ids = {}

db/migrate/20160823152519_fix_null_rubric_titles.rb

@@ -0,0 +1,11 @@
+class FixNullRubricTitles < ActiveRecord::Migration
+  tag :postdeploy
+
+  def up
+    DataFixup::FixNullRubricTitles.send_later_if_production_enqueue_args(
+      :run, :priority => Delayed::LOW_PRIORITY, :max_attempts => 1)
+  end
+
+  def down
+  end
+end

lib/data_fixup/fix_null_rubric_titles.rb

@@ -0,0 +1,12 @@
+module DataFixup
+  module FixNullRubricTitles
+    def self.run
+      Rubric.find_ids_in_ranges(:batch_size => 10_000) do |min_id, max_id|
+        Rubric.where(:id => min_id..max_id).where(:title => nil).each do |rubric|
+          rubric.populate_rubric_title
+          rubric.save
+        end
+      end
+    end
+  end
+end