112 lines
3.1 KiB
Ruby
112 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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module Status::ThreadingConcern
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extend ActiveSupport::Concern
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def ancestors(limit, account = nil)
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find_statuses_from_tree_path(ancestor_ids(limit), account)
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end
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def descendants(limit, account = nil, depth = nil)
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find_statuses_from_tree_path(descendant_ids(limit, depth), account, promote: true)
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end
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def self_replies(limit)
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account.statuses.where(in_reply_to_id: id, visibility: [:public, :unlisted]).reorder(id: :asc).limit(limit)
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end
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private
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def ancestor_ids(limit)
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key = "ancestors:#{id}"
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ancestors = Rails.cache.fetch(key)
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if ancestors.nil? || ancestors[:limit] < limit
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ids = ancestor_statuses(limit).pluck(:id).reverse!
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Rails.cache.write key, limit: limit, ids: ids
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ids
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else
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ancestors[:ids].last(limit)
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end
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end
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def ancestor_statuses(limit)
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Status.find_by_sql([<<-SQL.squish, id: in_reply_to_id, limit: limit])
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WITH RECURSIVE search_tree(id, in_reply_to_id, path)
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AS (
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SELECT id, in_reply_to_id, ARRAY[id]
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FROM statuses
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WHERE id = :id
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UNION ALL
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SELECT statuses.id, statuses.in_reply_to_id, path || statuses.id
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FROM search_tree
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JOIN statuses ON statuses.id = search_tree.in_reply_to_id
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WHERE NOT statuses.id = ANY(path)
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)
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SELECT id
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FROM search_tree
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ORDER BY path
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LIMIT :limit
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SQL
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end
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def descendant_ids(limit, depth)
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# use limit + 1 and depth + 1 because 'self' is included
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depth += 1 if depth.present?
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limit += 1 if limit.present?
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descendants_with_self = Status.find_by_sql([<<-SQL.squish, id: id, limit: limit, depth: depth])
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WITH RECURSIVE search_tree(id, path) AS (
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SELECT id, ARRAY[id]
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FROM statuses
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WHERE id = :id
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UNION ALL
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SELECT statuses.id, path || statuses.id
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FROM search_tree
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JOIN statuses ON statuses.in_reply_to_id = search_tree.id
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WHERE COALESCE(array_length(path, 1) < :depth, TRUE) AND NOT statuses.id = ANY(path)
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)
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SELECT id
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FROM search_tree
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ORDER BY path
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LIMIT :limit
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SQL
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descendants_with_self.pluck(:id) - [id]
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end
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def find_statuses_from_tree_path(ids, account, promote: false)
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statuses = Status.with_accounts(ids).to_a
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account_ids = statuses.map(&:account_id).uniq
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domains = statuses.filter_map(&:account_domain).uniq
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relations = account&.relations_map(account_ids, domains) || {}
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statuses.reject! { |status| StatusFilter.new(status, account, relations).filtered? }
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# Order ancestors/descendants by tree path
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statuses.sort_by! { |status| ids.index(status.id) }
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# Bring self-replies to the top
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if promote
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promote_by!(statuses) { |status| status.in_reply_to_account_id == status.account_id }
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else
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statuses
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end
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end
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def promote_by!(arr)
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insert_at = arr.find_index { |item| !yield(item) }
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return arr if insert_at.nil?
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arr.each_with_index do |item, index|
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next if index <= insert_at || !yield(item)
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arr.insert(insert_at, arr.delete_at(index))
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insert_at += 1
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end
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arr
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end
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end
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