From 28d77e373cbaf0908f86973a873c9bfd6c3221cb Mon Sep 17 00:00:00 2001 From: href Date: Wed, 9 Jan 2019 16:08:24 +0100 Subject: [PATCH] Flake Ids for Users and Activities --- lib/pleroma/PasswordResetToken.ex | 2 +- lib/pleroma/activity.ex | 1 + lib/pleroma/application.ex | 1 + lib/pleroma/filter.ex | 2 +- lib/pleroma/flake_id.ex | 181 ++++++++++++++++++ lib/pleroma/list.ex | 2 +- lib/pleroma/notification.ex | 6 +- lib/pleroma/user.ex | 2 + .../web/activity_pub/transmogrifier.ex | 5 - .../web/activity_pub/views/user_view.ex | 4 +- lib/pleroma/web/oauth/authorization.ex | 2 +- lib/pleroma/web/oauth/token.ex | 2 +- lib/pleroma/web/push/subscription.ex | 2 +- .../web/twitter_api/twitter_api_controller.ex | 24 +-- .../web/websub/websub_client_subscription.ex | 2 +- ...18172826_users_and_activities_flake_id.exs | 52 +++++ .../twitter_api_controller_test.exs | 6 +- 17 files changed, 264 insertions(+), 32 deletions(-) create mode 100644 lib/pleroma/flake_id.ex create mode 100644 priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs diff --git a/lib/pleroma/PasswordResetToken.ex b/lib/pleroma/PasswordResetToken.ex index 1dccdadae..c3c0384d2 100644 --- a/lib/pleroma/PasswordResetToken.ex +++ b/lib/pleroma/PasswordResetToken.ex @@ -10,7 +10,7 @@ defmodule Pleroma.PasswordResetToken do alias Pleroma.{User, PasswordResetToken, Repo} schema "password_reset_tokens" do - belongs_to(:user, User) + belongs_to(:user, User, type: Pleroma.FlakeId) field(:token, :string) field(:used, :boolean, default: false) diff --git a/lib/pleroma/activity.ex b/lib/pleroma/activity.ex index 8fd0311d2..d907791b5 100644 --- a/lib/pleroma/activity.ex +++ b/lib/pleroma/activity.ex @@ -8,6 +8,7 @@ defmodule Pleroma.Activity do import Ecto.Query @type t :: %__MODULE__{} + @primary_key {:id, Pleroma.FlakeId, autogenerate: true} # https://github.com/tootsuite/mastodon/blob/master/app/models/notification.rb#L19 @mastodon_notification_types %{ diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex index ad2797209..47c0e5b68 100644 --- a/lib/pleroma/application.ex +++ b/lib/pleroma/application.ex @@ -99,6 +99,7 @@ def start(_type, _args) do ], id: :cachex_idem ), + worker(Pleroma.FlakeId, []), worker(Pleroma.Web.Federator.RetryQueue, []), worker(Pleroma.Web.Federator, []), worker(Pleroma.Stats, []), diff --git a/lib/pleroma/filter.ex b/lib/pleroma/filter.ex index df5374a5c..308bd70e1 100644 --- a/lib/pleroma/filter.ex +++ b/lib/pleroma/filter.ex @@ -8,7 +8,7 @@ defmodule Pleroma.Filter do alias Pleroma.{User, Repo} schema "filters" do - belongs_to(:user, User) + belongs_to(:user, User, type: Pleroma.FlakeId) field(:filter_id, :integer) field(:hide, :boolean, default: false) field(:whole_word, :boolean, default: true) diff --git a/lib/pleroma/flake_id.ex b/lib/pleroma/flake_id.ex new file mode 100644 index 000000000..3c72807ca --- /dev/null +++ b/lib/pleroma/flake_id.ex @@ -0,0 +1,181 @@ +defmodule Pleroma.FlakeId do + @moduledoc """ + Flake is a decentralized, k-ordered id generation service. + + Adapted from: + + * [flaky](https://github.com/nirvana/flaky), released under the terms of the Truly Free License, + * [Flake](https://github.com/boundary/flake), Copyright 2012, Boundary, Apache License, Version 2.0 + """ + + @type t :: binary + + @behaviour Ecto.Type + use GenServer + require Logger + alias __MODULE__ + import Kernel, except: [to_string: 1] + + defstruct node: nil, time: 0, sq: 0 + + @doc "Converts a binary Flake to a String" + def to_string(<<0::integer-size(64), id::integer-size(64)>>) do + Kernel.to_string(id) + end + + def to_string(flake = <<_::integer-size(64), _::integer-size(48), _::integer-size(16)>>) do + encode_base62(flake) + end + + def to_string(s), do: s + + def from_string(<>) do + <<0::integer-size(64), id::integer-size(64)>> + end + + for i <- [-1, 0] do + def from_string(unquote(i)), do: <<0::integer-size(128)>> + def from_string(unquote(Kernel.to_string(i))), do: <<0::integer-size(128)>> + end + + def from_string(string) when is_binary(string) and byte_size(string) < 18 do + case Integer.parse(string) do + {id, _} -> <<0::integer-size(64), id::integer-size(64)>> + _ -> nil + end + end + + def from_string(string) do + string |> decode_base62 |> from_integer + end + + def to_integer(<>), do: integer + + def from_integer(integer) do + <<_time::integer-size(64), _node::integer-size(48), _seq::integer-size(16)>> = + <> + end + + @doc "Generates a Flake" + @spec get :: binary + def get, do: to_string(:gen_server.call(:flake, :get)) + + # -- Ecto.Type API + @impl Ecto.Type + def type, do: :uuid + + @impl Ecto.Type + def cast(value) do + {:ok, FlakeId.to_string(value)} + end + + @impl Ecto.Type + def load(value) do + {:ok, FlakeId.to_string(value)} + end + + @impl Ecto.Type + def dump(value) do + {:ok, FlakeId.from_string(value)} + end + + def autogenerate(), do: get() + + # -- GenServer API + def start_link do + :gen_server.start_link({:local, :flake}, __MODULE__, [], []) + end + + @impl GenServer + def init([]) do + {:ok, %FlakeId{node: mac(), time: time()}} + end + + @impl GenServer + def handle_call(:get, _from, state) do + {flake, new_state} = get(time(), state) + {:reply, flake, new_state} + end + + # Matches when the calling time is the same as the state time. Incr. sq + defp get(time, %FlakeId{time: time, node: node, sq: seq}) do + new_state = %FlakeId{time: time, node: node, sq: seq + 1} + {gen_flake(new_state), new_state} + end + + # Matches when the times are different, reset sq + defp get(newtime, %FlakeId{time: time, node: node}) when newtime > time do + new_state = %FlakeId{time: newtime, node: node, sq: 0} + {gen_flake(new_state), new_state} + end + + # Error when clock is running backwards + defp get(newtime, %FlakeId{time: time}) when newtime < time do + {:error, :clock_running_backwards} + end + + defp gen_flake(%FlakeId{time: time, node: node, sq: seq}) do + <> + end + + defp nthchar_base62(n) when n <= 9, do: ?0 + n + defp nthchar_base62(n) when n <= 35, do: ?A + n - 10 + defp nthchar_base62(n), do: ?a + n - 36 + + defp encode_base62(<>) do + integer + |> encode_base62([]) + |> List.to_string() + end + + defp encode_base62(int, acc) when int < 0, do: encode_base62(-int, acc) + defp encode_base62(int, []) when int == 0, do: '0' + defp encode_base62(int, acc) when int == 0, do: acc + + defp encode_base62(int, acc) do + r = rem(int, 62) + id = div(int, 62) + acc = [nthchar_base62(r) | acc] + encode_base62(id, acc) + end + + defp decode_base62(s) do + decode_base62(String.to_charlist(s), 0) + end + + defp decode_base62([c | cs], acc) when c >= ?0 and c <= ?9, + do: decode_base62(cs, 62 * acc + (c - ?0)) + + defp decode_base62([c | cs], acc) when c >= ?A and c <= ?Z, + do: decode_base62(cs, 62 * acc + (c - ?A + 10)) + + defp decode_base62([c | cs], acc) when c >= ?a and c <= ?z, + do: decode_base62(cs, 62 * acc + (c - ?a + 36)) + + defp decode_base62([], acc), do: acc + + defp time do + {mega_seconds, seconds, micro_seconds} = :erlang.timestamp() + 1_000_000_000 * mega_seconds + seconds * 1000 + :erlang.trunc(micro_seconds / 1000) + end + + defp mac do + {:ok, addresses} = :inet.getifaddrs() + + ifaces_with_mac = + Enum.reduce(addresses, [], fn {iface, attrs}, acc -> + if attrs[:hwaddr], do: [iface | acc], else: acc + end) + + iface = Enum.at(ifaces_with_mac, :rand.uniform(length(ifaces_with_mac)) - 1) + mac(iface) + end + + defp mac(name) do + {:ok, addresses} = :inet.getifaddrs() + proplist = :proplists.get_value(name, addresses) + hwaddr = Enum.take(:proplists.get_value(:hwaddr, proplist), 6) + <> = :binary.list_to_bin(hwaddr) + worker + end +end diff --git a/lib/pleroma/list.ex b/lib/pleroma/list.ex index a75dc006e..ca66c6916 100644 --- a/lib/pleroma/list.ex +++ b/lib/pleroma/list.ex @@ -8,7 +8,7 @@ defmodule Pleroma.List do alias Pleroma.{User, Repo, Activity} schema "lists" do - belongs_to(:user, Pleroma.User) + belongs_to(:user, User, type: Pleroma.FlakeId) field(:title, :string) field(:following, {:array, :string}, default: []) diff --git a/lib/pleroma/notification.ex b/lib/pleroma/notification.ex index c7d01f63b..2c8f60f19 100644 --- a/lib/pleroma/notification.ex +++ b/lib/pleroma/notification.ex @@ -9,8 +9,8 @@ defmodule Pleroma.Notification do schema "notifications" do field(:seen, :boolean, default: false) - belongs_to(:user, Pleroma.User) - belongs_to(:activity, Pleroma.Activity) + belongs_to(:user, User, type: Pleroma.FlakeId) + belongs_to(:activity, Activity, type: Pleroma.FlakeId) timestamps() end @@ -96,7 +96,7 @@ def dismiss(%{id: user_id} = _user, id) do end end - def create_notifications(%Activity{id: _, data: %{"to" => _, "type" => type}} = activity) + def create_notifications(%Activity{data: %{"to" => _, "type" => type}} = activity) when type in ["Create", "Like", "Announce", "Follow"] do users = get_notified_from_activity(activity) diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex index 18137106e..b006f9f19 100644 --- a/lib/pleroma/user.ex +++ b/lib/pleroma/user.ex @@ -17,6 +17,8 @@ defmodule Pleroma.User do @type t :: %__MODULE__{} + @primary_key {:id, Pleroma.FlakeId, autogenerate: true} + @email_regex ~r/^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/ @strict_local_nickname_regex ~r/^[a-zA-Z\d]+$/ diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex index 5d3feccfe..e646de608 100644 --- a/lib/pleroma/web/activity_pub/transmogrifier.ex +++ b/lib/pleroma/web/activity_pub/transmogrifier.ex @@ -900,15 +900,10 @@ defp user_upgrade_task(user) do maybe_retire_websub(user.ap_id) - # Only do this for recent activties, don't go through the whole db. - # Only look at the last 1000 activities. - since = (Repo.aggregate(Activity, :max, :id) || 0) - 1_000 - q = from( a in Activity, where: ^old_follower_address in a.recipients, - where: a.id > ^since, update: [ set: [ recipients: diff --git a/lib/pleroma/web/activity_pub/views/user_view.ex b/lib/pleroma/web/activity_pub/views/user_view.ex index fe8248107..dcf681b6d 100644 --- a/lib/pleroma/web/activity_pub/views/user_view.ex +++ b/lib/pleroma/web/activity_pub/views/user_view.ex @@ -160,7 +160,7 @@ def render("outbox.json", %{user: user, max_id: max_qid}) do "partOf" => iri, "totalItems" => info.note_count, "orderedItems" => collection, - "next" => "#{iri}?max_id=#{min_id - 1}" + "next" => "#{iri}?max_id=#{min_id}" } if max_qid == nil do @@ -207,7 +207,7 @@ def render("inbox.json", %{user: user, max_id: max_qid}) do "partOf" => iri, "totalItems" => -1, "orderedItems" => collection, - "next" => "#{iri}?max_id=#{min_id - 1}" + "next" => "#{iri}?max_id=#{min_id}" } if max_qid == nil do diff --git a/lib/pleroma/web/oauth/authorization.ex b/lib/pleroma/web/oauth/authorization.ex index cc4b74bc5..f8c65602d 100644 --- a/lib/pleroma/web/oauth/authorization.ex +++ b/lib/pleroma/web/oauth/authorization.ex @@ -14,7 +14,7 @@ defmodule Pleroma.Web.OAuth.Authorization do field(:token, :string) field(:valid_until, :naive_datetime) field(:used, :boolean, default: false) - belongs_to(:user, Pleroma.User) + belongs_to(:user, Pleroma.User, type: Pleroma.FlakeId) belongs_to(:app, App) timestamps() diff --git a/lib/pleroma/web/oauth/token.ex b/lib/pleroma/web/oauth/token.ex index f0ebc63f6..4e01b123b 100644 --- a/lib/pleroma/web/oauth/token.ex +++ b/lib/pleroma/web/oauth/token.ex @@ -14,7 +14,7 @@ defmodule Pleroma.Web.OAuth.Token do field(:token, :string) field(:refresh_token, :string) field(:valid_until, :naive_datetime) - belongs_to(:user, Pleroma.User) + belongs_to(:user, Pleroma.User, type: Pleroma.FlakeId) belongs_to(:app, App) timestamps() diff --git a/lib/pleroma/web/push/subscription.ex b/lib/pleroma/web/push/subscription.ex index 82b30950c..bd9d9f3a7 100644 --- a/lib/pleroma/web/push/subscription.ex +++ b/lib/pleroma/web/push/subscription.ex @@ -10,7 +10,7 @@ defmodule Pleroma.Web.Push.Subscription do alias Pleroma.Web.Push.Subscription schema "push_subscriptions" do - belongs_to(:user, User) + belongs_to(:user, User, type: Pleroma.FlakeId) belongs_to(:token, Token) field(:endpoint, :string) field(:key_p256dh, :string) diff --git a/lib/pleroma/web/twitter_api/twitter_api_controller.ex b/lib/pleroma/web/twitter_api/twitter_api_controller.ex index ede079963..43f8d64d0 100644 --- a/lib/pleroma/web/twitter_api/twitter_api_controller.ex +++ b/lib/pleroma/web/twitter_api/twitter_api_controller.ex @@ -265,8 +265,6 @@ def fetch_status(%{assigns: %{user: user}} = conn, %{"id" => id}) do end def fetch_conversation(%{assigns: %{user: user}} = conn, %{"id" => id}) do - id = String.to_integer(id) - with context when is_binary(context) <- TwitterAPI.conversation_id_to_context(id), activities <- ActivityPub.fetch_activities_for_context(context, %{ @@ -340,38 +338,42 @@ def get_by_id_or_ap_id(id) do end def favorite(%{assigns: %{user: user}} = conn, %{"id" => id}) do - with {_, {:ok, id}} <- {:param_cast, Ecto.Type.cast(:integer, id)}, - {:ok, activity} <- TwitterAPI.fav(user, id) do + with {:ok, activity} <- TwitterAPI.fav(user, id) do conn |> put_view(ActivityView) |> render("activity.json", %{activity: activity, for: user}) + else + _ -> json_reply(conn, 400, Jason.encode!(%{})) end end def unfavorite(%{assigns: %{user: user}} = conn, %{"id" => id}) do - with {_, {:ok, id}} <- {:param_cast, Ecto.Type.cast(:integer, id)}, - {:ok, activity} <- TwitterAPI.unfav(user, id) do + with {:ok, activity} <- TwitterAPI.unfav(user, id) do conn |> put_view(ActivityView) |> render("activity.json", %{activity: activity, for: user}) + else + _ -> json_reply(conn, 400, Jason.encode!(%{})) end end def retweet(%{assigns: %{user: user}} = conn, %{"id" => id}) do - with {_, {:ok, id}} <- {:param_cast, Ecto.Type.cast(:integer, id)}, - {:ok, activity} <- TwitterAPI.repeat(user, id) do + with {:ok, activity} <- TwitterAPI.repeat(user, id) do conn |> put_view(ActivityView) |> render("activity.json", %{activity: activity, for: user}) + else + _ -> json_reply(conn, 400, Jason.encode!(%{})) end end def unretweet(%{assigns: %{user: user}} = conn, %{"id" => id}) do - with {_, {:ok, id}} <- {:param_cast, Ecto.Type.cast(:integer, id)}, - {:ok, activity} <- TwitterAPI.unrepeat(user, id) do + with {:ok, activity} <- TwitterAPI.unrepeat(user, id) do conn |> put_view(ActivityView) |> render("activity.json", %{activity: activity, for: user}) + else + _ -> json_reply(conn, 400, Jason.encode!(%{})) end end @@ -556,7 +558,6 @@ def friend_requests(conn, params) do def approve_friend_request(conn, %{"user_id" => uid} = _params) do with followed <- conn.assigns[:user], - uid when is_number(uid) <- String.to_integer(uid), %User{} = follower <- Repo.get(User, uid), {:ok, follower} <- User.maybe_follow(follower, followed), %Activity{} = follow_activity <- Utils.fetch_latest_follow(follower, followed), @@ -578,7 +579,6 @@ def approve_friend_request(conn, %{"user_id" => uid} = _params) do def deny_friend_request(conn, %{"user_id" => uid} = _params) do with followed <- conn.assigns[:user], - uid when is_number(uid) <- String.to_integer(uid), %User{} = follower <- Repo.get(User, uid), %Activity{} = follow_activity <- Utils.fetch_latest_follow(follower, followed), {:ok, follow_activity} <- Utils.update_follow_state(follow_activity, "reject"), diff --git a/lib/pleroma/web/websub/websub_client_subscription.ex b/lib/pleroma/web/websub/websub_client_subscription.ex index 105b0069f..969ee0684 100644 --- a/lib/pleroma/web/websub/websub_client_subscription.ex +++ b/lib/pleroma/web/websub/websub_client_subscription.ex @@ -13,7 +13,7 @@ defmodule Pleroma.Web.Websub.WebsubClientSubscription do field(:state, :string) field(:subscribers, {:array, :string}, default: []) field(:hub, :string) - belongs_to(:user, User) + belongs_to(:user, User, type: Pleroma.FlakeId) timestamps() end diff --git a/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs b/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs new file mode 100644 index 000000000..6e5dfaa77 --- /dev/null +++ b/priv/repo/migrations/20181218172826_users_and_activities_flake_id.exs @@ -0,0 +1,52 @@ +defmodule Pleroma.Repo.Migrations.UsersAndActivitiesFlakeId do + use Ecto.Migration + + # This migrates from int serial IDs to custom Flake: + # 1- create a temporary uuid column + # 2- fill this column with compatibility ids (see below) + # 3- remove pkeys constraints + # 4- update relation pkeys with the new ids + # 5- rename the temporary column to id + # 6- re-create the constraints + def change do + # Old serial int ids are transformed to 128bits with extra padding. + # The application (in `Pleroma.FlakeId`) handles theses IDs properly as integers; to keep compatibility + # with previously issued ids. + #execute "update activities set external_id = CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);" + #execute "update users set external_id = CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);" + + execute "ALTER TABLE activities DROP CONSTRAINT activities_pkey CASCADE;" + execute "ALTER TABLE users DROP CONSTRAINT users_pkey CASCADE;" + + execute "ALTER TABLE activities ALTER COLUMN id DROP default;" + execute "ALTER TABLE users ALTER COLUMN id DROP default;" + + execute "ALTER TABLE activities ALTER COLUMN id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);" + execute "ALTER TABLE users ALTER COLUMN id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(id), 32, '0' ) AS uuid);" + + execute "ALTER TABLE activities ADD PRIMARY KEY (id);" + execute "ALTER TABLE users ADD PRIMARY KEY (id);" + + # Fkeys: + # Activities - Referenced by: + # TABLE "notifications" CONSTRAINT "notifications_activity_id_fkey" FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE + # Users - Referenced by: + # TABLE "filters" CONSTRAINT "filters_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE + # TABLE "lists" CONSTRAINT "lists_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE + # TABLE "notifications" CONSTRAINT "notifications_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE + # TABLE "oauth_authorizations" CONSTRAINT "oauth_authorizations_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) + # TABLE "oauth_tokens" CONSTRAINT "oauth_tokens_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) + # TABLE "password_reset_tokens" CONSTRAINT "password_reset_tokens_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) + # TABLE "push_subscriptions" CONSTRAINT "push_subscriptions_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE + # TABLE "websub_client_subscriptions" CONSTRAINT "websub_client_subscriptions_user_id_fkey" FOREIGN KEY (user_id) REFERENCES users(id) + + execute "ALTER TABLE notifications ALTER COLUMN activity_id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(activity_id), 32, '0' ) AS uuid);" + execute "ALTER TABLE notifications ADD CONSTRAINT notifications_activity_id_fkey FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE;" + + for table <- ~w(notifications filters lists oauth_authorizations oauth_tokens password_reset_tokens push_subscriptions websub_client_subscriptions) do + execute "ALTER TABLE #{table} ALTER COLUMN user_id SET DATA TYPE uuid USING CAST( LPAD( TO_HEX(user_id), 32, '0' ) AS uuid);" + execute "ALTER TABLE #{table} ADD CONSTRAINT #{table}_user_id_fkey FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;" + end + + end +end diff --git a/test/web/twitter_api/twitter_api_controller_test.exs b/test/web/twitter_api/twitter_api_controller_test.exs index f22cdd870..863abd10f 100644 --- a/test/web/twitter_api/twitter_api_controller_test.exs +++ b/test/web/twitter_api/twitter_api_controller_test.exs @@ -797,7 +797,7 @@ test "with credentials, invalid activity", %{conn: conn, user: current_user} do |> with_credentials(current_user.nickname, "test") |> post("/api/favorites/create/1.json") - assert json_response(conn, 500) + assert json_response(conn, 400) end end @@ -1621,7 +1621,7 @@ test "it approves a friend request" do conn = build_conn() |> assign(:user, user) - |> post("/api/pleroma/friendships/approve", %{"user_id" => to_string(other_user.id)}) + |> post("/api/pleroma/friendships/approve", %{"user_id" => other_user.id}) assert relationship = json_response(conn, 200) assert other_user.id == relationship["id"] @@ -1644,7 +1644,7 @@ test "it denies a friend request" do conn = build_conn() |> assign(:user, user) - |> post("/api/pleroma/friendships/deny", %{"user_id" => to_string(other_user.id)}) + |> post("/api/pleroma/friendships/deny", %{"user_id" => other_user.id}) assert relationship = json_response(conn, 200) assert other_user.id == relationship["id"]