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  • Sérgio 16 posts 117 karma points
    Oct 15, 2021 @ 14:55

    Problem while extending model

    Hello everyone.

    I've been using Umbraco, mostly on version 7. I started getting my feet wet on v9 and some concepts are new to me, of course.

    I have checked out how to extend models at the official documentation:

    I've followed those steps and extended a class called HomePage:

    namespace Umbraco.Cms.Web.Common.PublishedModels
        public partial class Homepage
            public int MyProperty { get; set; }

    But I am constantly getting this error:

    Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation.CompilationFailedException: 'One or more compilation failures occurred:
    x5hui2un.yt1(66,94): error CS0433: The type 'Homepage' exists in both 'ModelsGeneratedAssembly, Version=, Culture=neutral, PublicKeyToken=null' and 'Umbraco9Test, Version=, Culture=neutral, PublicKeyToken=null''

    Could anyone be so kind as to shed some light here? I can't pinpoint what I may be doing wrong.

    Thank you very much in advance.

  • Søren Kottal 571 posts 3749 karma points MVP 3x c-trib
    Oct 15, 2021 @ 15:16
    Søren Kottal

    You need to have your generated models, and your partial classes in the same project.

    What are your models builder settings? You can set them in appsettings (

    Make sure your models directory is in the project where you extend the models.

  • Sérgio 16 posts 117 karma points
    Oct 15, 2021 @ 15:41

    That was the missing link. Nowhere in the documentation that information is present. I was using the default settings (InMemoryAuto) and never remembered or realized that the class would be outside the project.

    I changed it to SourceCodeAuto, updated the models and it's now working.

    Thank you very much, Søren.

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