Add a script to backfill action log from existing records

1 files changed, 61 insertions, 0 deletions

diff --git a/lib/tasks/node_actions.rake b/lib/tasks/node_actions.rake
new file mode 100644
index 0000000..fdd286c
--- /dev/null
+++ b/lib/tasks/node_actions.rake
@@ -0,0 +1,61 @@
+namespace :node_actions do
+  desc "Rebuild inferred NodeAction entries from existing revisions and " \
+       "node timestamps. Witnessed entries (inferred_from IS NULL) are " \
+       "never touched; previously inferred ones are deleted and " \
+       "regenerated, so the task is idempotent. Scope with NODE_ID=n."
+  task :backfill => :environment do
+    scope = Node.where.not(:parent_id => nil)
+    scope = scope.where(:id => ENV["NODE_ID"]) if ENV["NODE_ID"]
+
+    created = 0
+
+    ActiveRecord::Base.transaction do
+      stale = NodeAction.where.not(:inferred_from => nil)
+      stale = stale.where(:node_id => ENV["NODE_ID"]) if ENV["NODE_ID"]
+      puts "Removing #{stale.count} previously inferred entries"
+      stale.delete_all
+
+      witnessed_creates  = NodeAction.where(:action => "create",  :inferred_from => nil).pluck(:node_id).to_set
+      witnessed_promotes = NodeAction.where(:action => "publish", :inferred_from => nil).pluck(:page_id).to_set
+
+      scope.find_each do |node|
+        # Every page row except the current draft was once promoted to
+        # head. Autosaves never carry node_id, so they cannot appear.
+        revisions  = node.pages.to_a.reject { |page| page.id == node.draft_id }
+        first_page = node.pages.first
+
+        unless witnessed_creates.include?(node.id)
+          NodeAction.record!(
+            :node => node, :page => first_page, :user => first_page&.editor,
+            :action        => "create",
+            :occurred_at   => node.created_at,
+            :inferred_from => "from_node_created_at",
+            :title => first_page&.translations&.find_by(:locale => I18n.default_locale)&.title,
+            :path  => node.unique_name,
+            :human_readable_node_name =>
+              first_page&.translations&.find_by(:locale => I18n.default_locale)&.title)
+          created += 1
+        end
+
+        previous = nil
+        revisions.each do |page|
+          unless witnessed_promotes.include?(page.id)
+            diff = NodeAction.head_diff(previous, page)
+            NodeAction.record!(
+              :node => node, :page => page, :user => page.editor,
+              :action        => "publish",
+              :occurred_at   => page.updated_at,
+              :inferred_from => "from_page_revision",
+              :via           => "draft",
+              :human_readable_node_name => diff[:title]["to"],
+              **diff)
+            created += 1
+          end
+          previous = page
+        end
+      end
+    end
+
+    puts "Created #{created} inferred entries"
+  end
+end