Deep nested data in forms

I have some connected models: e.g. (made up example):

Post->Comment->Author->Address

My controller's index action creates an array using a model find
function using the containable behaviour - let's call the output
$postSummary.

I have a form that displays data from across the $postSummary array:
e.g.;

Stuff about the Post
The comments belonging the Post
Some info about the Author of the Post
The Address of the Author.

I want to create a form on this page that allows me to edit the
Author's Address details on this page. I can see the data in the
array:

$postSummary[0][Comment][0][Author][Address][..fields...]

...and I can display using them a simple echo statement.

My question is:

How can I create a form and display that same information ready for
edit?

I have tried all sorts of variations of form options and input names,
with no luck:

Is it because I don't have an array called $this->data? If so, how do
I access the stuff and goodness inside it and post it back to my
controller function?

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