model::read - restrict fields in HABTM objects

Hi all,

I have a model ('Facility) that has a HABTM relationship with
another ('ContentImage'). When I call read on an instance of Facility
it brings back details of related ContentImages. I would like to
exclude a field in all of the ContentImages (a field called 'data' - a
blob containing image data) in a certain instance.

Am I able to do this? I can see how you can pass a list of required
fields to read, but I can't figure out the syntax for doing this for
the HABTM model retrieved.

Any help much appreciated,

Toby
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