/// <summary>
/// Returns the user preferences for a user, ensuring a value is returned
/// </summary>
/// <param name="userId">User ID</param>
/// <param name="valueUpdate">Value Update Function</param>
/// <returns>Task</returns>
private async Task UpdateUserPreferences(string userId, Action <UserPreferences> valueUpdate)
{
bool isNewEntry = false;
UserPreferences preferences = await _UserPreferencesCollection.Find(u => u.Id == userId).FirstOrDefaultAsync();
if (preferences == null)
{
preferences = UserPreferences.CreateDefaultUserPreferences(userId);
isNewEntry = true;
}
valueUpdate(preferences);
if (isNewEntry)
{
await _UserPreferencesCollection.InsertOneAsync(preferences);
}
else
{
await _UserPreferencesCollection.ReplaceOneAsync(u => u.Id == userId, preferences);
}
}