How to search the query document for field

[ThriceGood]

I am trying to search thequery document for the node related to the particular field.

I've been looking through the API docs to find something to help but couldn't find a function to help search through the nodes.

I could have sworn that before the weekend I had been able to use something like the following:

context.query.document.node('myField')

But today it seems like I must have imagined that.

Is there a way to simply query for the node like in my first example?