Thanks, I realize that each node may have several relations and I need id of relation type "RotatorImage" which has an id of '3'.

I got this:

var s = ApplicationContext.Current.Services.RelationService.GetByParentId(item.Id);
var rotatorImageId = 0; 
foreach (var relationItem in s)
{
   if(relationItem.RelationTypeId == 3)
   {
      rotatorImageId = relationItem.ChildId;
   }
}
<p>@rotatorImageId</p>

This works, but I am just curious....

For better self-documentation, it would be nice to use .RelationType == "RotatorImage" or even better, use a method that allows filtering by RelationType. For the former, I see that both .RelationType and .RelationType.ToString() returns literally:

"Umbraco.Core.Models.RelationType"

That is an object? And for the latter, I don't see how to filter the relations on a given node, by type.

It seems like since var s above holds all my relations, I should be able to filter on a specific one of those relations, by it's type. But none of the methods seem to do that directly.

For example, I could get a relation type object for my Relation Type w/ id = 3 (that's "RotatorImage"):

var t = ApplicationContext.Current.Services.RelationService.GetRelationTypeById(3);

And then use some method like:

s.GetAllRelationsByRelationType(t)

But my 's' variable does not have the method GetAllRelationsByRelationType (I'm looking up the object methods and properties using VS intellisense).

Anyways, what we got gets me through this, so no big deal. But if the answer is obvious or my understanding is way off, please let me know!

thanks Jeavon

Hi Jacob,

You could do something like this:

var rotatorImageId = 0; 
var s = ApplicationContext.Current.Services.RelationService.GetByParentId(item.Id).FirstOrDefault(x => x.RelationTypeId == 3);
if (s != null)
{
    rotatorImageId = s.ChildId;
}

Also there many other methods from the RelationService and they are documentated here

Jeavon

Thanks for reference and I tried the above...

I can't get it to work, but have narrowed it down to this:

.FirstOrDefault(x => x.RelationTypeId == 3)

Do I need to include a using statement for Linq, like @using System.Linq or something?

Hi Jacob,

I was testing with the below and it works for me without any using statement:

@{
    var item = Model.Content;
    var rotatorImageId = 0;
    var s = ApplicationContext.Current.Services.RelationService.GetByParentOrChildId(item.Id).FirstOrDefault(x => x.RelationTypeId == 1);
    if (s != null)
    {
        rotatorImageId = s.ChildId;
    }
}  

Jeavon

Thx Jeavon,

I tried this exactly w/in the context that item.Id is known to be good:

var rotatorImageId = 0; 

var s = ApplicationContext.Current.Services.RelationService.GetByParentOrChildId(item.Id).FirstOrDefault(x => x.RelationTypeId == 3);
if (s != null)
{
    rotatorImageId = s.ChildId;
}

And I get error. This works:

var rotatorImageId = 0; 
var s = ApplicationContext.Current.Services.RelationService.GetByParentId(item.Id);


foreach (var relationItem in s)
{
   if(relationItem.RelationTypeId == 3)
   {
      rotatorImageId = relationItem.ChildId;
   }
}

No big deal, it's working.

Hi Jacob,

Strange it doesn't work for you. Does it cause an error or just nothing displays?

Jeavon

Jeavon,

I'm using the Umbraco Partial View Macro Files editor. When I load the page that uses this macro, the page works, but where the Macro would be I just get:

Error loading Partial View script (file: ~/Views/MacroPartials/rCycleHighlightsRotator.cshtml) 

Hi Jacob,

Could you check your log4net (\App_Data\Logs\UmbracoTraceLog.txt) file to see if there is some more info in there?

Jeavon

Last error is:

2014-02-04 08:22:00,885 [8] WARN  umbraco.macro - [Thread 10] Error loading Partial View (file: ~/Views/MacroPartials/rCycleHighlightsRotator.cshtml). Exception: System.Web.HttpCompileException (0x80004005): c:\inetpub\wwwroot\capradio\Views\MacroPartials\rCycleHighlightsRotator.cshtml(80): error CS1977: Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type
   at System.Web.Compilation.AssemblyBuilder.Compile()
   at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
   at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound)
   at System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.FileExists(String virtualPath)
   at Microsoft.Web.Mvc.ViewEngineFixWorker`1.GetPathFromSpecificName(ControllerContext controllerContext, String name, String cacheKey, String[]& searchedLocations)
   at Microsoft.Web.Mvc.ViewEngineFixWorker`1.GetPath(ControllerContext controllerContext, String[] locations, String[] areaLocations, String locationsPropertyName, String name, String controllerName, String cacheKeyPrefix, Boolean useCache, String[]& searchedLocations)
   at Microsoft.Web.Mvc.ViewEngineFixWorker`1.FindPartialView(ControllerContext controllerContext, String partialViewName, Boolean useCache)
   at System.Web.Mvc.ViewEngineCollection.Find(Func`2 lookup, Boolean trackSearchedPaths)
   at Umbraco.Web.Mvc.ControllerExtensions.EnsureViewObjectDataOnResult(ControllerBase controller, ViewResultBase result)
   at Umbraco.Web.Mvc.ControllerExtensions.RenderViewResultAsString(ControllerBase controller, ViewResultBase viewResult)
   at Umbraco.Web.Macros.PartialViewMacroEngine.Execute(MacroModel macro, INode currentPage)
   at umbraco.macro.LoadPartialViewMacro(MacroModel macro)
   at umbraco.macro.renderMacro(Hashtable pageElements, Int32 pageId)

Ah, I think I know what it is. How do you set what "item" is?

    var dynamicPublishedMNTPNodeList = new List<string>();
    foreach (var id in CurrentPage.cprHighlights)
    {
        dynamicPublishedMNTPNodeList.Add(id.InnerText);
    }
    var dynamicMNTPCollection = Umbraco.Content(dynamicPublishedMNTPNodeList);
    @foreach (var item in dynamicMNTPCollection)
    {...}

item is accessed in the foreach loop

Ah yes, that is it, as you have used dynamic CurrentPage instead of Model.Content we need to cast the Id to use the lambda expression. It would be like this:

var s = ApplicationContext.Current.Services.RelationService.GetByParentId((int)item.Id).FirstOrDefault(x => x.RelationTypeId == 3);

Phew, I never like it when I can't work out why something works for one person but not another! :-)

Yes, it works. Success. Thx.

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