Hi, I have a requirement to update a prevalue in a datatypedefinition post install/content creation...

Im currently using a DataSettingsEditorStorage class that lets me retrieve a list of settings: List<Setting<string,string>> (where the first string is the alias from the DB table [cmsDataTypePreValues] and the second string is the value).

I am iterating over the list and (using the alias as a key) updating the correct value.

Here is an example piece of code...

 var currentSettingsList = this.GetCurrentSettings(this.dataEditorSettingsStorageWrapper, dataTypeDefinitionWrapper.Id);

        // Container for the list of settings that will be pushed back to Umbraco
        var settingsToPushList = new List<Setting<string, string>>();

        // loop through existing settings, checking if they need to be overridden - if not add it back unchanged
        foreach (var currentSetting in currentSettingsList)
        {
            var settingToPush = currentSetting;

            var settingToUpdate = newDtdSettings.SettingsToUpdate.FirstOrDefault(x => x.Key == currentSetting.Key);

            if (settingToUpdate.Key != null)
            {
                // make sure that a check for the node exists is performed - if required
                if (newDtdSettings.SettingsRequiringNodeExistsCheck.Contains(currentSetting.Key) && !nodeHelper.NodeExists(int.Parse(settingToUpdate.Value)))
                {
                    throw new ArgumentNullException(string.Format("Unable to resolve node: {0}", settingToUpdate.Value));
                }

                settingToPush.Value = settingToUpdate.Value;
            }

            settingsToPushList.Add(settingToPush);
        }

public IEnumerable<Setting<string, string>> GetCurrentSettings(IDataEditorSettingsStorageWrapper settingsStorageWrapper, int dataTypeDefinitionNodeId)
    {
        var currentSettings = settingsStorageWrapper.GetSettings(dataTypeDefinitionNodeId);

        if (currentSettings == null)
        {
            throw new NullReferenceException();
        }
        return currentSettings;
    }

This is being used in conjunction with a bunch of other methods that do not use the newer (V6) Services.

I want to port my code over to use the newer services, but as I go, have noticed that the only options available on the IDataTypeService for retrieving prevalues are:

//
    // Summary:
    //     Gets a specific PreValue by its Id
    //
    // Parameters:
    //   id:
    //     Id of the PreValue to retrieve the value from
    //
    // Returns:
    //     PreValue as a string
    string GetPreValueAsString(int id);
    //
    // Summary:
    //     Gets all values for an Umbraco.Core.Models.IDataTypeDefinition
    //
    // Parameters:
    //   id:
    //     Id of the Umbraco.Core.Models.IDataTypeDefinition to retrieve prevalues from
    //
    // Returns:
    //     An enumerable list of string values
    IEnumerable<string> GetPreValuesByDataTypeId(int id);

As this list only contains values, I lose the ability to determine (via the alias) which item needs changing. Is there anyway to return - via the new Services - a list of prevalue settings (alias/value) or indeed a better way of doing all this??? I am hesitant to return an Ienumerable

(hopefully i've explained that enough, if anymore detail is needed I am happy to explain further...)

Cheers,

Chris Whitts