hometown/app/models/concerns/status_threading_concern.rb
Akihiko Odaki 498327b2e3 Exclude status itself from context query (#7083)
ancestor_statuses and descendant_statuses used to include the root status
itself, but the behavior is confusing because the root status is not
an ancestor nor descendant.
2018-04-09 09:58:53 +02:00

82 lines
2.0 KiB
Ruby

# frozen_string_literal: true
module StatusThreadingConcern
extend ActiveSupport::Concern
def ancestors(account = nil)
find_statuses_from_tree_path(ancestor_ids, account)
end
def descendants(account = nil)
find_statuses_from_tree_path(descendant_ids, account)
end
private
def ancestor_ids
Rails.cache.fetch("ancestors:#{id}") do
ancestor_statuses.pluck(:id)
end
end
def ancestor_statuses
Status.find_by_sql([<<-SQL.squish, id: in_reply_to_id])
WITH RECURSIVE search_tree(id, in_reply_to_id, path)
AS (
SELECT id, in_reply_to_id, ARRAY[id]
FROM statuses
WHERE id = :id
UNION ALL
SELECT statuses.id, statuses.in_reply_to_id, path || statuses.id
FROM search_tree
JOIN statuses ON statuses.id = search_tree.in_reply_to_id
WHERE NOT statuses.id = ANY(path)
)
SELECT id
FROM search_tree
ORDER BY path DESC
SQL
end
def descendant_ids
descendant_statuses.pluck(:id)
end
def descendant_statuses
Status.find_by_sql([<<-SQL.squish, id: id])
WITH RECURSIVE search_tree(id, path)
AS (
SELECT id, ARRAY[id]
FROM statuses
WHERE in_reply_to_id = :id
UNION ALL
SELECT statuses.id, path || statuses.id
FROM search_tree
JOIN statuses ON statuses.in_reply_to_id = search_tree.id
WHERE NOT statuses.id = ANY(path)
)
SELECT id
FROM search_tree
ORDER BY path
SQL
end
def find_statuses_from_tree_path(ids, account)
statuses = statuses_with_accounts(ids).to_a
# FIXME: n+1 bonanza
statuses.reject! { |status| filter_from_context?(status, account) }
# Order ancestors/descendants by tree path
statuses.sort_by! { |status| ids.index(status.id) }
end
def statuses_with_accounts(ids)
Status.where(id: ids).includes(:account)
end
def filter_from_context?(status, account)
StatusFilter.new(status, account).filtered?
end
end