Fix credo style reports following it's update

Mainly transform `with` into `case`

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon_web/resolvers/event.ex

@@ -176,11 +176,12 @@ defmodule MobilizonWeb.Resolvers.Event do
   # and that it's the actor requesting leaving the event we return true
   @spec check_that_participant_is_not_only_organizer(integer(), integer()) :: boolean()
   defp check_that_participant_is_not_only_organizer(event_id, actor_id) do
-    with [%Participant{actor: %Actor{id: participant_actor_id}}] <-
-           Mobilizon.Events.list_organizers_participants_for_event(event_id) do
-      participant_actor_id == actor_id
-    else
-      _ -> false
+    case Mobilizon.Events.list_organizers_participants_for_event(event_id) do
+      [%Participant{actor: %Actor{id: participant_actor_id}}] ->
+        participant_actor_id == actor_id
+
+      _ ->
+        false
     end
   end
 

lib/mobilizon_web/resolvers/group.ex

@@ -218,17 +218,18 @@ defmodule MobilizonWeb.Resolvers.Group do
   # and that it's the actor requesting leaving the group we return true
   @spec check_that_member_is_not_only_administrator(integer(), integer()) :: boolean()
   defp check_that_member_is_not_only_administrator(group_id, actor_id) do
-    with [
-           %Member{
-             actor: %Actor{
-               id: member_actor_id
-             }
-           }
-         ] <-
-           Member.list_administrator_members_for_group(group_id) do
-      actor_id == member_actor_id
-    else
-      _ -> false
+    case Member.list_administrator_members_for_group(group_id) do
+      [
+        %Member{
+          actor: %Actor{
+            id: member_actor_id
+          }
+        }
+      ] ->
+        actor_id == member_actor_id
+
+      _ ->
+        false
     end
   end
 end

lib/mobilizon_web/resolvers/picture.ex

@@ -35,10 +35,17 @@ defmodule MobilizonWeb.Resolvers.Picture do
 
   @spec do_fetch_picture(String.t()) :: {:ok, Picture.t()} | {:error, :not_found}
   defp do_fetch_picture(picture_id) do
-    with %Picture{id: id, file: file} = _pic <- Media.get_picture(picture_id) do
-      {:ok,
-       %{name: file.name, url: file.url, id: id, content_type: file.content_type, size: file.size}}
-    else
+    case Media.get_picture(picture_id) do
+      %Picture{id: id, file: file} = _pic ->
+        {:ok,
+         %{
+           name: file.name,
+           url: file.url,
+           id: id,
+           content_type: file.content_type,
+           size: file.size
+         }}
+
       _err ->
         {:error, "Picture with ID #{picture_id} was not found"}
     end