adds a task for recalculating the proposals hot_score

lib/tasks/proposals.rake

@@ -0,0 +1,9 @@
+namespace :proposals do
+  desc "Updates all proposals by recalculating their hot_score"
+  task hot_score: :environment do
+    Proposal.find_in_batches do |proposals|
+      proposals.each(&:save)
+    end
+  end
+
+end