conversation_view.ex
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conversation_view.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.MastodonAPI.ConversationView do
	use Pleroma.Web, :view

	alias Pleroma.Activity
	alias Pleroma.Repo
	alias Pleroma.Web.ActivityPub.ActivityPub
	alias Pleroma.Web.MastodonAPI.AccountView
	alias Pleroma.Web.MastodonAPI.StatusView

	def render("participations.json", %{participations: participations, for: user}) do
	safe_render_many(participations, __MODULE__, "participation.json", %{
	as: :participation,
	for: user
	})
	end

	def render("participation.json", %{participation: participation, for: user}) do
	participation = Repo.preload(participation, conversation: [], recipients: [])

	last_activity_id =
	with nil <- participation.last_activity_id do
	ActivityPub.fetch_latest_direct_activity_id_for_context(
	participation.conversation.ap_id,
	%{
	user: user,
	blocking_user: user
	}
	)
	end

	activity = Activity.get_by_id_with_object(last_activity_id)

	# Conversations return all users except the current user,
	# except when the current user is the only participant
	users =
	if length(participation.recipients) > 1 do
	Enum.reject(participation.recipients, &(&1.id == user.id))
	else
	participation.recipients
	end

	%{
	id: participation.id \|> to_string(),
	accounts: render(AccountView, "index.json", users: users, for: user),
	unread: !participation.read,
	last_status:
	render(StatusView, "show.json",
	activity: activity,
	direct_conversation_id: participation.id,
	for: user
	)
	}
	end
	end