Reset canceled_at when a section is uncanceled.

app/models/section.rb

@@ -189,6 +189,13 @@ def self.import(filepath)
           end
         end
 
+        if section.status != 'C'
+          if section.status_changed? || !section.canceled_at.blank?
+            section.canceled_at = nil
+            @import_report.report_item('Executing Import', 'Uncanceled Sections', "#{section.section_and_number} in #{section.term}")
+          end
+        end
+
         # Save if changed, touch if unchanged
         if section.changed? || section.enrollments.last.new_record?
           section.save!

test/models/section_test.rb

@@ -220,6 +220,17 @@ class SectionTest < ActiveSupport::TestCase
     assert_not_nil @section_three.canceled_at
   end
 
+  test 'import identifies uncanceled sections' do
+    assert_equal @section.status, 'CN'
+    @section.update(status: 'C', canceled_at: Time.now)
+    assert_equal @section.status, 'C'
+    assert_not_nil @section.canceled_at
+    Section.import(file_fixture('test_crse.csv'))
+    @section.reload
+    assert_equal @section.status, 'CN'
+    assert_nil @section.canceled_at
+  end
+
   test 'import creates an enrollment for a section' do
     assert_difference('@section.enrollments.count', + 1) do
       Section.import(file_fixture('test_crse.csv'))