AngularJS: How do I manually set input to $valid in controller?

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You cannot directly change a form’s validity. If all the descendant inputs are valid, the form is valid, if not, then it is not.

What you should do is to set the validity of the input element. Like so;

addItem.capabilities.$setValidity("youAreFat", false);

Now the input (and so the form) is invalid.
You can also see which error causes invalidation.

addItem.capabilities.errors.youAreFat == true;

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