Conversations: A few refactors

lib/pleroma/web/mastodon_api/views/conversation_view.ex

@@ -34,7 +34,8 @@ def render("participation.json", %{participation: participation, for: user}) do
 
     activity = Activity.get_by_id_with_object(last_activity_id)
 
-    # Conversations return all users except current user when current user is not only participant
+    # 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))

test/pleroma/web/mastodon_api/controllers/conversation_controller_test.exs

@@ -65,12 +65,11 @@ test "returns correct conversations", %{
       assert Participation.unread_count(user_one) == 0
     end
 
-    test "special behaviour when conversation have only one user", %{
+    test "includes the user if the user is the only participant", %{
       user: user_one,
-      user_two: user_two,
       conn: conn
     } do
-      {:ok, direct} = create_direct_message(user_one, [])
+      {:ok, _direct} = create_direct_message(user_one, [])
 
       res_conn = get(conn, "/api/v1/conversations")
 
@@ -78,14 +77,11 @@ test "special behaviour when conversation have only one user", %{
 
       assert [
                %{
-                 "accounts" => res_accounts,
-                 "last_status" => res_last_status
+                 "accounts" => [account]
                }
              ] = response
 
-      account_ids = Enum.map(res_accounts, & &1["id"])
-      assert length(res_accounts) == 1
-      assert user_one.id in account_ids
+      assert user_one.id == account["id"]
     end
 
     test "observes limit params", %{

test/pleroma/web/mastodon_api/views/conversation_view_test.exs

@@ -38,9 +38,9 @@ test "represents a Mastodon Conversation entity" do
     assert conversation.last_status.id == activity.id
     assert conversation.last_status.account.id == user.id
 
-    account_ids = Enum.map(conversation.accounts, & &1.id)
-    assert length(conversation.accounts) == 1
-    assert other_user.id in account_ids
+    assert [account] = conversation.accounts
+    assert account.id == other_user.id
+
     assert conversation.last_status.pleroma.direct_conversation_id == participation.id
   end
 end