Merge pull request #968 from alphagov/allow-gss

Add task to create duplicate datasets with gss codes

lib/tasks/once_off/convert_snac_to_gss.rake

@@ -0,0 +1,43 @@
+namespace :once_off do
+  desc "Creates duplicate datasets with GSS codes instead of SNACs for local authority data_sets"
+  task convert_snac_to_gss: [:environment] do
+    snac_to_gss_lookup = load_snac_to_gss_lookup
+
+    affected_services.each do |service|
+      puts("INFO: Updating Service: #{service.slug}")
+      duplicate = service.active_data_set.duplicate
+
+      duplicate.change_notes += ", then updated by once_off:convert_snac_to_gss task"
+      duplicate.save!
+
+      duplicate.places.each do |place|
+        next if already_gss?(place.gss)
+
+        snac = place.gss
+        gss = snac_to_gss_lookup[snac]
+        if gss.nil?
+          puts(" - ERROR: Failed to update SNAC #{snac} for #{service.slug}")
+        else
+          place.gss = gss
+          place.save!
+        end
+      end
+    end
+  end
+end
+
+def load_snac_to_gss_lookup
+  lookup_cache = {}
+  CSV.foreach("lib/tasks/once_off/snac_to_gss_translation.csv") do |row|
+    lookup_cache[row[0]] = row[1]
+  end
+  lookup_cache
+end
+
+def affected_services
+  Service.where(location_match_type: "local_authority")
+end
+
+def already_gss?(code)
+  code.length > 4
+end