Merge branch 'fix-all-custom-fields-deleted' into 'develop'

Fix not to use unupdated attachments when all fields are deleted

See merge request pleroma/pleroma!1596

lib/pleroma/user/info.ex

@@ -49,7 +49,7 @@ defmodule Pleroma.User.Info do
     field(:mascot, :map, default: nil)
     field(:emoji, {:array, :map}, default: [])
     field(:pleroma_settings_store, :map, default: %{})
-    field(:fields, {:array, :map}, default: [])
+    field(:fields, {:array, :map}, default: nil)
     field(:raw_fields, {:array, :map}, default: [])
 
     field(:notification_settings, :map,
@@ -422,7 +422,7 @@ def remove_reblog_mute(info, ap_id) do
 
   # ``fields`` is an array of mastodon profile field, containing ``{"name": "…", "value": "…"}``.
   # For example: [{"name": "Pronoun", "value": "she/her"}, …]
-  def fields(%{fields: [], source_data: %{"attachment" => attachment}}) do
+  def fields(%{fields: nil, source_data: %{"attachment" => attachment}}) do
     limit = Pleroma.Config.get([:instance, :max_remote_account_fields], 0)
 
     attachment
@@ -431,6 +431,8 @@ def fields(%{fields: [], source_data: %{"attachment" => attachment}}) do
     |> Enum.take(limit)
   end
 
+  def fields(%{fields: nil}), do: []
+
   def fields(%{fields: fields}), do: fields
 
   def follow_information_update(info, params) do

test/web/activity_pub/transmogrifier_test.exs

@@ -563,6 +563,14 @@ test "it works with custom profile fields" do
                %{"name" => "foo", "value" => "updated"},
                %{"name" => "foo1", "value" => "updated"}
              ]
+
+      update_data = put_in(update_data, ["object", "attachment"], [])
+
+      {:ok, _} = Transmogrifier.handle_incoming(update_data)
+
+      user = User.get_cached_by_ap_id(user.ap_id)
+
+      assert User.Info.fields(user.info) == []
     end
 
     test "it works for incoming update activities which lock the account" do