AngularJS validating a row as a single compound entity - angularjs

Question

I've got a structure of authors, readers, and preferences (high, medium, low, or blacklisted). All preferences are medium unless a rule overrides it. Whenever a new book becomes available, one reader should be given the opportunity to read that book. Some readers like particular authors, so the rule for that would look like:
author
reader
preference
Charles Dickens
Joe Bloggs
high
Some authors might be blacklisted for all readers (null):
author
reader
preference
Adolf Hitler
null
blacklisted
But a reader can override that rule:
author
reader
preference
Adolf Hitler
Mary Jones
medium
Some readers mightn't have as much time to read and want to read fewer books by any author (null):
author
reader
preference
null
John Smith
low
But that reader might make time for a particular author:
author
reader
preference
Geoffrey Chaucer
John Smith
high
So, all those rules in combination look like:
author
reader
preference
Charles Dickens
Joe Bloggs
high
Adolf Hitler
null
blacklisted
Adolf Hitler
Mary Jones
medium
null
John Smith
low
Geoffrey Chaucer
John Smith
high
When a new book by Charles Dickens becomes available, Joe Bloggs is more likely to be given the opportunity to read it, and John Smith is less likely, with Mary Jones having an average chance.
When a new book by Geoffrey Chaucer becomes available, Joe Bloggs and Mary Jones both have an average chance to be given the opportunity to read it, and John Smith is more likely.
If a new book by Adolf Hitler becomes available, Joe Bloggs will not be given an opportunity to read it, Mary Jones will have an average chance, and the rules for John Smith are inconsistent (Adolf Hitler blacklisted for any reader and any author low preference) and need to be resolved.
When the rules are being edited, I need a way to validate all the rules against each other. For instance, Joe Bloggs can't say that his preference for Charles Dickens is both high and low. If that happened, I want both rules to be highlighted. And in the above example, the two rules "Adolf Hitler, null, blacklisted" and "null, John Smith, low" should both be highlighted until resolved, for example with another row "Adolf Hitler, John Smith, blacklisted".
However, in AngularJS, I only know how to validate single inputs, not how to treat the entire row as a single input and also to make sure it doesn't clash with any other rows.
e.g.
<textarea ng-model="description" ng-minlength="5" ng-maxlength="255" required="required"></textarea>
How can I validate a compound item i.e. {rules: [{author: 1, reader: 2, preference: "high"}]} against all other items?
<div ng-repeat="rule in rules">
<input ng-model="rule.author">
<input ng-model="rule.reader">
<input ng-model="rule.preference">
</div>
I.e. I want to validate rule as an entire object, not just rule.author, rule.reader, and rule.preference.