discourse/lib/tasks/categories.rake

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task "categories:move_topics", [:from_category, :to_category] => [:environment] do |_, args|
from_category_id = args[:from_category]
to_category_id = args[:to_category]
if !from_category_id || !to_category_id
puts "ERROR: Expecting categories:move_topics[from_category_id,to_category_id]"
exit 1
end
from_category = Category.find(from_category_id)
to_category = Category.find(to_category_id)
if from_category.present? && to_category.present?
puts "Moving topics from #{from_category.slug} to #{to_category.slug}..."
Topic.where(category_id: from_category.id).update_all(category_id: to_category.id)
from_category.update_attribute(:topic_count, 0)
puts "Updating category stats..."
Category.update_stats
end
puts "", "Done!", ""
end