Allow to limit the quantity of nested items

[sobrinho]

Hey,

What do you think about an option to limit the quantity of nested items?

Rails already support that and throws an exception when you exceed, i.e.:

accepts_nested_attributes_for :things, limit: 3

It means you only can have at most 3 things, otherwise, an exception is thrown.

Would be great to have a option to work with that, i.e.:

link_to_add_association 'Add', f, :things, limit: 3

In that case, if the user hit the 3 limit, the add button just stop to work and came back to work if him remove at least 1 thing.

Also, we'll need a custom event after adding the last item to handle the interface (alerts, classes, etc), i.e.:

$('#container').on('cocoon:limit-reached', function (e) {
  $(".add-thing").addClass("disabled");
});

Makes sense? Would you allow pull request implementing this?

[nathanvda]

This request has popped up a few times, and my standard response would be something like i mentioned in #176 (also see #59).

However your approach sounds interesting.

The harder part: imho if a button is not allowed to be pressed, just hide it (a disabled button mostly just confuses/annoys people). But that is a personal taste/rule.

But I would definitely consider such a pull request.

[sobrinho]

#206 seems the way to go, closing :)