discourse/lib/post_destroyer.rb

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#
# How a post is deleted is affected by who is performing the action.
# this class contains the logic to delete it.
#
class PostDestroyer
def initialize(user, post)
@user, @post = user, post
end
def destroy
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if @user.staff?
staff_destroyed
elsif @user.id == @post.user_id
user_destroyed
end
end
# When a post is properly deleted. Well, it's still soft deleted, but it will no longer
# show up in the topic
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def staff_destroyed
Post.transaction do
# Update the last post id to the previous post if it exists
last_post = Post.where("topic_id = ? and id <> ?", @post.topic_id, @post.id).order('created_at desc').limit(1).first
if last_post.present?
@post.topic.update_attributes(last_posted_at: last_post.created_at,
last_post_user_id: last_post.user_id,
highest_post_number: last_post.post_number)
# If the poster doesn't have any other posts in the topic, clear their posted flag
unless Post.exists?(["topic_id = ? and user_id = ? and id <> ?", @post.topic_id, @post.user_id, @post.id])
TopicUser.update_all 'posted = false', topic_id: @post.topic_id, user_id: @post.user_id
end
end
# Feature users in the topic
Jobs.enqueue(:feature_topic_users, topic_id: @post.topic_id, except_post_id: @post.id)
@post.post_actions.map(&:trash!)
f = PostActionType.types.map{|k,v| ["#{k}_count", 0]}
Post.with_deleted.update_all(Hash[*f.flatten], id: @post.id)
@post.trash!
Topic.reset_highest(@post.topic_id)
@post.update_flagged_posts_count
# Remove any reply records that point to deleted posts
post_ids = PostReply.where(reply_id: @post.id).pluck(:post_id)
PostReply.delete_all reply_id: @post.id
if post_ids.present?
Post.where(id: post_ids).each { |p| p.update_column :reply_count, p.replies.count }
end
# Remove any notifications that point to this deleted post
Notification.delete_all topic_id: @post.topic_id, post_number: @post.post_number
@post.topic.trash! if @post.post_number == 1
end
end
# When a user 'deletes' their own post. We just change the text.
def user_destroyed
Post.transaction do
@post.revise(@user, I18n.t('js.post.deleted_by_author'), force_new_version: true)
@post.update_column(:user_deleted, true)
@post.update_flagged_posts_count
end
end
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end