Working on project this evening I found myself wanting to use the current content of a page variable as part of the key to later variable.
At first I thought it was not practical but after a little experimentation I found a method.
Imagine a situation where you have a list of people and you wish to find data on posts under a key of their own name,
Example post yaml,
---<br />
layout: post<br />
date: '2013-01-01'<br />
John Smith: I like this<br />
Bob Green: I do not like this<br />
---
Example page yaml,
` —
reviewers:
- John Smith
- Bob Green
—</p>`
{% for person in page.reviewers %}
{{person}}
{% for post in site.posts %}</p>
{{post.[person]}}
{% endfor %}
{% endfor %}
This is the key bit
{{post.[person]}}
The square brackets around the variable name cause its value to be used, not its name.