DEV: Add reviewables:mass-handle rake task (#30658)

This commit introduces a new rake task that can be used in situations where a community receives a large number of flags/reports and needs a quick way to handle all of those pending reports. Usage instructions are included in the rake task source code.

Internal topic: t/145475.

lib/tasks/reviewables.rake

@@ -0,0 +1,114 @@
+# frozen_string_literal: true
+
+desc "Perform an action on all pending reviewables of a given type"
+task "reviewables:mass-handle", %i[reviewable_type username action_id] => :environment do |_, args|
+  args_hash = args.to_hash
+
+  if args_hash.size == 0
+    pending_types = Reviewable.where(status: Reviewable.statuses[:pending]).distinct.pluck(:type)
+    puts <<~HELP
+      rake reviewables:mass-handle[reviewable_type,username,action]
+      reviewable_type:
+        a type of `Reviewable` such as `ReviewableFlaggedPost`, `ReviewableQueuedPost` etc.
+        Your site currently has #{pending_types.size} types with pending records, and they are:
+        #{pending_types}
+      username:
+        username of the acting user who will perform the action on the reviewables
+      action:
+        the name of the action that you want to mass-perform on pending
+        reviewables. There isn't one set of actions that works on all types of
+        reviewables because each type defines its own set of actions.
+        To list all available actions for a given type, run this rake task
+        without the action argument and it will print the list of actions that
+        you can perform.
+    HELP
+    next
+  end
+
+  reviewable_class =
+    begin
+      args[:reviewable_type]&.constantize
+    rescue NameError
+      raise "#{args[:reviewable_type].inspect} is not a valid Reviewable type."
+    end
+
+  if !reviewable_class || !(reviewable_class < Reviewable)
+    raise "#{args[:reviewable_type].inspect} is not a Reviewable subclass."
+  end
+
+  acting_user = User.find_by(username_lower: args[:username]&.downcase)
+  raise "Cannot find user with id=#{args[:username].inspect}." if !acting_user
+
+  relation = reviewable_class.where(status: Reviewable.statuses[:pending])
+  count = relation.count
+
+  if count == 0
+    puts "There are 0 pending #{reviewable_class}. Nothing to do."
+    next
+  end
+
+  if !args_hash.key?(:action_id)
+    collection = relation.first.actions_for(acting_user.guardian)
+    actions = collection.bundles.map(&:actions).flatten.map(&:server_action)
+
+    puts <<~MSG
+      You need to specify an action to perform on the #{count} pending #{reviewable_class}.
+      Here's a list of the all avaiable actions on the #{reviewable_class} type:
+      #{actions.join("\n")}
+    MSG
+    next
+  end
+
+  action_id = args[:action_id]
+  if !reviewable_class.method_defined?(:"perform_#{action_id}")
+    raise "#{reviewable_class} doesn't support an action with the name #{action_id.inspect}."
+  end
+
+  print <<~MSG.strip + " "
+    There are #{count} pending #{reviewable_class} records.
+    @#{acting_user.username} will perform #{action_id.inspect} on them.
+    Are you sure you want to proceed? Type "#{count}" to confirm or "n" to cancel:
+  MSG
+
+  while true
+    input = STDIN.readline.strip
+
+    if input == "n"
+      puts "Task cancelled."
+      break
+    elsif input == count.to_s
+      puts "Performing #{action_id.inspect} on #{count} #{reviewable_class} records..."
+      failed = []
+      relation.find_each do |reviewable|
+        result = reviewable.perform(acting_user, action_id)
+
+        if result.success?
+          putc "."
+        else
+          putc "F"
+          failed << { reviewable:, errors: result.errors }
+        end
+      rescue => error
+        putc "F"
+        failed << { reviewable:, errors: [error] }
+      end
+
+      puts ""
+      puts "#{count - failed.size} records have been processed successfully and #{failed.size} failed."
+
+      if failed.size > 0
+        puts "Here's a detailed report of each record that failed:"
+        failed.each do |obj|
+          puts <<~TEXT
+            reviewable id: #{obj[:reviewable].id}
+            errors: #{obj[:errors].inspect}
+          TEXT
+          puts "=" * 50
+        end
+      end
+      break
+    else
+      print "Can't understand your input. Please try again: "
+    end
+  end
+end