public async Task CheckValidityAsync(CallContext callContext)
{
await QueryValidationHelper.CheckCanCreateLanguageWithName(Name, callContext.DbContext, callContext.Localized);
await QueryValidationHelper.CheckUserExistsAsync(callContext.DbContext, UserId);
var user = await callContext.DbContext.Users.AsNoTracking().SingleAsync(user => user.Id == UserId);
if (!await callContext.RoleChecker.UserIsAdminAsync(user))
{
throw new InvalidOperationException("User not admin");
}
}