Golang如何从html / template访问切片字段

I have a []struct{} and that []struct{} has a field called ThreadName and I'm trying to access that from in the template like so:

{{ index .Posts 0 $.ThreadName}}

not sure how to do this properly any information would be great thanks.

Use the following to access the thread name of the first post:

{{(index .Posts 0).ThreadName}}

playground example