[Rails] need to mimic threading across controllers

Hi,

I'm hoping to make a parent and several of its dependent children
available for updates by multiple users. I want to figure out how to
implement and test the following:

1. A user 'checks out' a parent resource: when seeking to update,
other users are informed that the resource and its dependent children
are currently unavailable for updating.

2. A user 'checks out' a child resource: when seeking to update, other
users are informed that the child is unavailable for updating, though
the parent may be available.

I think a reason I'm stumped here is that I have little deployment
experience. Yet, even so, how would I test the behaviors above,
locally?

Thanks for any comments,

Lille

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