create multiple fingerprints wip

Rakefile

@@ -503,3 +503,39 @@ task clear_e621_user_favs_migrated_at: :environment do
   #   pb.progress += b.size
   # end
 end
+
+task create_post_file_fingerprints: :environment do
+  def migrate_posts_for_user(user)
+    puts "migrating posts for #{user.to_param}"
+    pb =
+      ProgressBar.create(
+        total: user.posts.count,
+        format: "%t: %c/%C %B %p%% %a %e",
+      )
+    user
+      .posts
+      .includes(files: :blob)
+      .find_in_batches(batch_size: 16) do |batch|
+        ReduxApplicationRecord.transaction do
+          batch.each do |post|
+            post.files.each { |file| file.ensure_fingerprint! }
+            puts "migrated #{post.id} / #{post.to_param} / '#{post.title_for_view}'"
+            pb.progress = [pb.progress + 1, pb.total].min
+          end
+        end
+      end
+  end
+
+  if ENV["user"].present?
+    for_user = ENV["user"] || raise("need 'user'")
+    user = DomainController.find_model_from_param(Domain::User, for_user)
+    raise "user '#{for_user}' not found" unless user
+    migrate_posts_for_user(user)
+  elsif ENV["users_descending"].present?
+    # all users with posts, ordered by post count descending
+    users = Domain::User::FaUser.order(num_watched_by: :desc).limit(20)
+    users.find_each(batch_size: 1) { |user| migrate_posts_for_user(user) }
+  else
+    raise "need 'user' or 'users_descending'"
+  end
+end