105 lines
2.8 KiB
Elixir
105 lines
2.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Hashtag do
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use Ecto.Schema
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import Ecto.Changeset
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import Ecto.Query
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alias Ecto.Multi
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alias Pleroma.Hashtag
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alias Pleroma.Object
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alias Pleroma.Repo
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schema "hashtags" do
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field(:name, :string)
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many_to_many(:objects, Object, join_through: "hashtags_objects", on_replace: :delete)
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timestamps()
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end
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def get_by_name(name) do
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from(h in Hashtag)
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|> where([h], fragment("name = ?::citext", ^String.downcase(name)))
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|> Repo.one()
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end
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def get_or_create_by_name(name) when is_bitstring(name) do
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with %Hashtag{} = hashtag <- get_by_name(name) do
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{:ok, hashtag}
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else
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_ ->
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%Hashtag{}
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|> changeset(%{name: name})
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|> Repo.insert()
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end
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end
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def get_or_create_by_names(names) when is_list(names) do
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names = Enum.map(names, &String.downcase/1)
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timestamp = NaiveDateTime.truncate(NaiveDateTime.utc_now(), :second)
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structs =
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Enum.map(names, fn name ->
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%Hashtag{}
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|> changeset(%{name: name})
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|> Map.get(:changes)
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|> Map.merge(%{inserted_at: timestamp, updated_at: timestamp})
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end)
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try do
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with {:ok, %{query_op: hashtags}} <-
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Multi.new()
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|> Multi.insert_all(:insert_all_op, Hashtag, structs, on_conflict: :nothing)
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|> Multi.run(:query_op, fn _repo, _changes ->
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{:ok,
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Repo.all(from(ht in Hashtag, where: ht.name in fragment("?::citext[]", ^names)))}
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end)
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|> Repo.transaction() do
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{:ok, hashtags}
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else
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{:error, _name, value, _changes_so_far} -> {:error, value}
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end
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rescue
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e -> {:error, e}
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end
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end
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def changeset(%Hashtag{} = struct, params) do
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struct
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|> cast(params, [:name])
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|> update_change(:name, &String.downcase/1)
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|> validate_required([:name])
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|> unique_constraint(:name)
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end
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def unlink(%Object{id: object_id}) do
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with {_, hashtag_ids} <-
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from(hto in "hashtags_objects",
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where: hto.object_id == ^object_id,
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select: hto.hashtag_id
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)
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|> Repo.delete_all(),
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{:ok, unreferenced_count} <- delete_unreferenced(hashtag_ids) do
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{:ok, length(hashtag_ids), unreferenced_count}
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end
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end
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@delete_unreferenced_query """
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DELETE FROM hashtags WHERE id IN
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(SELECT hashtags.id FROM hashtags
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LEFT OUTER JOIN hashtags_objects
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ON hashtags_objects.hashtag_id = hashtags.id
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WHERE hashtags_objects.hashtag_id IS NULL AND hashtags.id = ANY($1));
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"""
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def delete_unreferenced(ids) do
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with {:ok, %{num_rows: deleted_count}} <- Repo.query(@delete_unreferenced_query, [ids]) do
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{:ok, deleted_count}
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end
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end
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end
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