Create redirects for merged/deleted candidates so old URLs still work

app.rb

@@ -185,6 +185,10 @@ end
 # end
 
 get '/candidates/:id/?' do
+  if @deleted_candidate = DeletedCandidate.get(params[:id])
+    redirect "/candidates/#{@deleted_candidate.candidate_id}", 301 # HTTP 301 Moved Permanently
+  end
+
   if @candidate = Candidate.get(params[:id])
     @candidacies = repository(:default).adapter.select("
       SELECT

models.rb

@@ -86,6 +86,13 @@ class Candidate
   end
 end
 
+class DeletedCandidate
+  include DataMapper::Resource
+
+  property  :old_candidate_id,  Integer, :key => true       # ID of candidate that has been merged/deleted
+  property  :candidate_id,      Integer, :required => true  # ID of candidate that has been kept
+end
+
 class Candidacy
   include DataMapper::Resource