Easy way to merge duplicate candidates

scripts/merge-candidates.rb

@@ -0,0 +1,49 @@
+require_relative "../models"
+
+def show_candidate(id)
+  c = Candidate.get(id)
+  
+  template = "%6s\t%50s\t%20s\t%3s"
+  
+  puts template % [ c.id, c.forenames, c.surname, c.sex ]
+  
+  ccy_template = "%20s\t%15s\t%20s\t%20s"
+  c.candidacies.each do |ccy|
+    puts template % [ ccy.election.body.name, ccy.election.d, ccy.district.name, ccy.party.name]
+  end
+end
+
+winner = ARGV.shift
+loser = ARGV.shift
+
+puts "WINNER"
+show_candidate(winner)
+
+puts
+
+puts "LOSER"
+show_candidate(loser)
+
+puts "Are you sure you want to merge these two candidates? The loser will be deleted. (Y or N)"
+
+answer = gets.chomp.downcase
+
+unless answer == 'y'
+  puts "Aborting. No changes made to the database."
+  exit
+end
+
+# Transfer all the loser's candidacies to the winner
+repository(:default).adapter.select("
+  UPDATE candidacies
+  SET candidate_id = #{winner}
+  WHERE candidate_id = #{loser}
+")
+
+# Delete the loser candidate
+Candidate.get(loser).destroy
+
+puts "Merge completed. Here is the merged candidate:"
+puts
+show_candidate(winner)
+