public async Task <IOperationResult> SaveCityAsync(string userId, string cityName)
{
var operationResult = new OperationResult();
operationResult.ValidateNotNull(userId, $"{nameof(userId)} should not have a default value.");
operationResult.ValidateNotEmpty(userId, $"{nameof(userId)} should not be empty.");
operationResult.ValidateNotNull(cityName, $"{nameof(cityName)} should not have a default value.");
operationResult.ValidateNotEmpty(cityName, $"{nameof(cityName)} should not be empty.");
if (operationResult.Success)
{
var user = await this.FindUserById(userId).ConfigureAwait(false);
operationResult.ValidateNotNull(user, $"{nameof(user)} should not be null.");
if (operationResult.Success == false)
{
return(operationResult);
}
if (user.SavedCities.Contains(cityName))
{
operationResult.AppendErrorMessage("City already saved");
return(operationResult);
}
user.SavedCities.Add(cityName);
var update = Builders <User> .Update.Set("SavedCities", user.SavedCities);
await this._usersCollection.UpdateOneAsync(u => u.Id == user.Id, update).ConfigureAwait(false);
return(operationResult);
}
return(operationResult);
}