- def search(query, resolve \\ false, for_user \\ nil) do
- # Strip the beginning @ off if there is a query
- query = String.trim_leading(query, "@")
-
- if resolve, do: get_or_fetch(query)
-
- {:ok, results} =
- Repo.transaction(fn ->
- Ecto.Adapters.SQL.query(Repo, "select set_limit(0.25)", [])
- Repo.all(search_query(query, for_user))
- end)
-
- results
- end
-
- def search_query(query, for_user) do
- fts_subquery = fts_search_subquery(query)
- trigram_subquery = trigram_search_subquery(query)
- union_query = from(s in trigram_subquery, union_all: ^fts_subquery)
- distinct_query = from(s in subquery(union_query), order_by: s.search_type, distinct: s.id)
-
- from(s in subquery(boost_search_rank_query(distinct_query, for_user)),
- order_by: [desc: s.search_rank],
- limit: 20
- )
- end
-
- defp boost_search_rank_query(query, nil), do: query
-
- defp boost_search_rank_query(query, for_user) do
- friends_ids = get_friends_ids(for_user)
- followers_ids = get_followers_ids(for_user)
-
- from(u in subquery(query),
- select_merge: %{
- search_rank:
- fragment(
- """
- CASE WHEN (?) THEN (?) * 1.3
- WHEN (?) THEN (?) * 1.2
- WHEN (?) THEN (?) * 1.1
- ELSE (?) END
- """,
- u.id in ^friends_ids and u.id in ^followers_ids,
- u.search_rank,
- u.id in ^friends_ids,
- u.search_rank,
- u.id in ^followers_ids,
- u.search_rank,
- u.search_rank
- )
- }
- )
- end
-
- defp fts_search_subquery(term, query \\ User) do
- processed_query =
- term
- |> String.replace(~r/\W+/, " ")
- |> String.trim()
- |> String.split()
- |> Enum.map(&(&1 <> ":*"))
- |> Enum.join(" | ")
-
- from(
- u in query,
- select_merge: %{
- search_type: ^0,
- search_rank:
- fragment(
- """
- ts_rank_cd(
- setweight(to_tsvector('simple', regexp_replace(?, '\\W', ' ', 'g')), 'A') ||
- setweight(to_tsvector('simple', regexp_replace(coalesce(?, ''), '\\W', ' ', 'g')), 'B'),
- to_tsquery('simple', ?),
- 32
- )
- """,
- u.nickname,
- u.name,
- ^processed_query
- )
- },
- where:
- fragment(
- """
- (setweight(to_tsvector('simple', regexp_replace(?, '\\W', ' ', 'g')), 'A') ||
- setweight(to_tsvector('simple', regexp_replace(coalesce(?, ''), '\\W', ' ', 'g')), 'B')) @@ to_tsquery('simple', ?)
- """,
- u.nickname,
- u.name,
- ^processed_query
- )
- )
- end
-
- defp trigram_search_subquery(term) do
- from(
- u in User,
- select_merge: %{
- # ^1 gives 'Postgrex expected a binary, got 1' for some weird reason
- search_type: fragment("?", 1),
- search_rank:
- fragment(
- "similarity(?, trim(? || ' ' || coalesce(?, '')))",
- ^term,
- u.nickname,
- u.name
- )
- },
- where: fragment("trim(? || ' ' || coalesce(?, '')) % ?", u.nickname, u.name, ^term)
- )
- end
-
- def blocks_import(%User{} = blocker, blocked_identifiers) when is_list(blocked_identifiers) do
- Enum.map(
- blocked_identifiers,
- fn blocked_identifier ->
- with {:ok, %User{} = blocked} <- get_or_fetch(blocked_identifier),
- {:ok, blocker} <- block(blocker, blocked),
- {:ok, _} <- ActivityPub.block(blocker, blocked) do
- blocked
- else
- err ->
- Logger.debug("blocks_import failed for #{blocked_identifier} with: #{inspect(err)}")
- err
- end
- end
- )
- end
-