Umbraco Models Builder is a vital feature for Umbraco websites, generating "strongly-typed" C# classes that represent Document Types in the CMS. These models enhance development by being utilized in controllers and views. However, each generated class includes the current Umbraco version, which may impact version management.
In upgrading to Umbraco 15, users of ModelsBuilder may encounter issues due to the removal of the IPublishedSnapshotAccessor interface, causing model build failures. Søren Kottal suggests reintroducing the interface by adding a specific code snippet to .generated.cs files, allowing for successful model rebuilding and compatibility with Umbraco 15.