This link provides the example of rendering a nested view using a relative path.
I want to do the same thing, but from within an {{each}} block.
Refer this Example for {{each}}
Since the scope has changed in the block, is it possible to get to view from there, or must I use an absolute path?
To my understanding after reading the source, the {{#each}} helper is a basic iterator that only knows about the array you pass it. So in your example the array App.projectController.content is all it has access to directly.
You’ll need to use {{#collection}} for what you’re trying to do or you need to use absolute paths within the {{#each}} helper. Here’s an example using the {{#collection}} helper.
EDIT (12/02/13)
I have updated the jsFiddle to show two different ways to accomplish this using the each helper with the action helper.