public async Task <string> AppendTo <TProperty>(RedisValue id, Expression <Func <T, TProperty> > expression, RedisValue appendValue)
{
var propertyName = _parser.GetPropertyName(expression);
var key = _storageKeyGenerator.GetKey(_typeDefinition, id);
var current = await _database.HashGetAsync(key, propertyName).ConfigureAwait(false);
current = $"{current}{appendValue}";
await _database.HashSetAsync(key, propertyName, current).ConfigureAwait(false);
return(current);
}