discourse/app/services/post_owner_changer.rb

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class PostOwnerChanger
def initialize(params)
@post_ids = params[:post_ids]
@topic = Topic.with_deleted.find_by(id: params[:topic_id].to_i)
@new_owner = params[:new_owner]
@acting_user = params[:acting_user]
raise ArgumentError unless @post_ids && @topic && @new_owner && @acting_user
end
def change_owner!
ActiveRecord::Base.transaction do
@post_ids.each do |post_id|
post = Post.with_deleted.find(post_id)
@topic.user = @new_owner if post.is_first_post?
if post.user == nil
@topic.recover! if post.is_first_post?
end
post.topic = @topic
post.set_owner(@new_owner, @acting_user)
end
@topic.update_statistics
@new_owner.user_stat.update(first_post_created_at: @new_owner.posts(true).order('created_at ASC').first.try(:created_at))
@topic.save!
end
end
end