public static async Task <bool> IsGroupMember(this IArangoDatabase database, string userId, string groupId)
{
if (groupId == null || userId == null)
{
return(false);
}
var group = await database.Collection("Group").DocumentAsync <Group>(groupId);
if (group == null)
{
return(false);
}
var isMember = await database.CreateStatement <bool>(
$@"return (FOR v in 1 INBOUND 'Group/{groupId}' Graph 'GroupUsersGraph'
FILTER v._key == '{userId}'
return v) != []").ToListAsync();
return(isMember.FirstOr(false) || await database.IsAdmin(userId, groupId));
}