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lib/tasks/update_mt_chromosome_name.rake

@@ -2,11 +2,12 @@
 
 namespace :snps do
   desc "change mitochondrial snp names from 'mt' to 'm'."
-  task :update_mt_snps => :environment do
-    Snp.where(:chromosome => "MT").each do |s|
-      s.chromosome = "M"
+  task update_mt_snps: :environment do
+    Snp.where(chromosome: 'MT').each do |s|
+      s.chromosome = 'M'
       s.position = s.position.strip
       s.save
     end
+    puts 'updated MT positions'
   end
 end