Remove orphaned piece_justificatives (#3982)

Suppression des pièces justificatives orphelines en base

lib/tasks/deployment/20190521131030_purge_unattached_piece_justificative.rake

@@ -0,0 +1,21 @@
+namespace :after_party do
+  desc 'Deployment task: purge_unattached_piece_justificative'
+  task purge_unattached_piece_justificative: :environment do
+    puts "Running deploy task 'purge_unattached_piece_justificative'"
+
+    piece_justificatives = PieceJustificative.where(type_de_piece_justificative_id: nil)
+    progress = ProgressReport.new(piece_justificatives.count)
+    piece_justificatives.find_each do |pj|
+      # detach from dossier to ensure we do not trigger touch
+      pj.update_column(:dossier_id, nil)
+      pj.remove_content!
+      pj.destroy
+      progress.inc
+    end
+    progress.finish
+
+    # Update task as completed.  If you remove the line below, the task will
+    # run with every deploy (or every time you call after_party:run).
+    AfterParty::TaskRecord.create version: '20190521131030'
+  end
+end