Fix removing an account from a list

Mastodon (Frontend) changed a different method for deletes,
keeping old format as mastodon documentation is too loose

lib/pleroma/web/api_spec/operations/list_operation.ex

@@ -114,7 +114,7 @@ defmodule Pleroma.Web.ApiSpec.ListOperation do
       description: "Add accounts to the given list.",
       operationId: "ListController.add_to_list",
       parameters: [id_param()],
-      requestBody: add_remove_accounts_request(),
+      requestBody: add_remove_accounts_request(true),
       security: [%{"oAuth" => ["write:lists"]}],
       responses: %{
         200 => Operation.response("Empty object", "application/json", %Schema{type: :object})
@@ -127,8 +127,16 @@ defmodule Pleroma.Web.ApiSpec.ListOperation do
       tags: ["Lists"],
       summary: "Remove accounts from list",
       operationId: "ListController.remove_from_list",
-      parameters: [id_param()],
-      requestBody: add_remove_accounts_request(),
+      parameters: [
+        id_param(),
+        Operation.parameter(
+          :account_ids,
+          :query,
+          %Schema{type: :array, items: %Schema{type: :string}},
+          "Array of account IDs"
+        )
+      ],
+      requestBody: add_remove_accounts_request(false),
       security: [%{"oAuth" => ["write:lists"]}],
       responses: %{
         200 => Operation.response("Empty object", "application/json", %Schema{type: :object})
@@ -171,7 +179,7 @@ defmodule Pleroma.Web.ApiSpec.ListOperation do
     )
   end
 
-  defp add_remove_accounts_request do
+  defp add_remove_accounts_request(required) when is_boolean(required) do
     request_body(
       "Parameters",
       %Schema{
@@ -180,9 +188,9 @@ defmodule Pleroma.Web.ApiSpec.ListOperation do
         properties: %{
           account_ids: %Schema{type: :array, description: "Array of account IDs", items: FlakeID}
         },
-        required: [:account_ids]
+        required: required && [:account_ids]
       },
-      required: true
+      required: required
     )
   end
 end

lib/pleroma/web/mastodon_api/controllers/list_controller.ex

@@ -86,6 +86,19 @@ defmodule Pleroma.Web.MastodonAPI.ListController do
     json(conn, %{})
   end
 
+  def remove_from_list(
+        %{assigns: %{list: list}, params: %{account_ids: account_ids}} = conn,
+        _
+      ) do
+    Enum.each(account_ids, fn account_id ->
+      with %User{} = followed <- User.get_cached_by_id(account_id) do
+        Pleroma.List.unfollow(list, followed)
+      end
+    end)
+
+    json(conn, %{})
+  end
+
   defp list_by_id_and_user(%{assigns: %{user: user}, params: %{id: id}} = conn, _) do
     case Pleroma.List.get(id, user) do
       %Pleroma.List{} = list -> assign(conn, :list, list)