How do I set the value property in AngularJS' ng-options?

Question

Here is what seems to be bothering a lot of people (including me).

When using the ng-options directive in AngularJS to fill in the options for a &

Answer 1

To send a custom value called my_hero to the server using a normal form submit:

JSON:

"heroes": [
  {"id":"iron", "label":"Iron Man Rocks!"},
  {"id":"super", "label":"Superman Rocks!"}
]

HTML:

The server will receive either iron or super as the value of my_hero.

This is similar to the answer by @neemzy, but specifying separate data for the value attribute.