Golang Iris框架在范围内渲染

I'm trying to loop over items and render it in separate template, but {{ . }} in item.html contains root variables instead of a single item. I tried to assign item to a variable {{ range $i, $item := .Items }}, but the result is the same.

<!-- list.html -->
{{ range .Items }}
    {{ . }} this one is OK
    {{ render "item.html" }}
{{ end }}

<!-- item.html -->
{{ . }} this one is not