[Rails] render SVG in view

I'd like to render a nested hash as a tree SVG inside a view. It's
becoming cumbersome to write the hash traversing inside the view.

Is the appropriate location for the SVG generation inside a controller?
If so, should I respond_to formal.xml? I would then call the SVG
generation action from inside the view.

I know there are various ways of doing this, I'm just curious what the
standard choice is.

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