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[Firepup650 (Firepup Sixfifty)]

Probably a modification of this query:

@tshenry

Change owner of all topics in categories

---

Find the category IDs with the following rake task:

rake categories:list

Specify the new owner and categories to operate on. The categories should be an array of category ids, categories 1, 2 and 3 in the example:

rails c
user = User.find_by(username_lower: "lowercase-username")
categories = [1, 2, 3]

Get all topic ids for the given categories and change the owner of the first post in all matched topics.

topics = Topic.where(category_id: categories).pluck(:id)

topics.each do |topic|
  PostOwnerChanger.new(
    post_ids: Post.where(topic_id: topic).where(post_number: 1).pluck(:id),
    topic_id: topic,
    new_owner: user,
    acting_user: Discourse.system_user,
    skip_revision: true
  ).change_owner!
end

(Assuming they’re in one category)