[Form] missing doc about "virtual" fields

[brikou]

What are "virtual" fields ?

[weaverryan]

Great question - I only see it in FormType and it's used for iteration in VirtualFormAwareIterator. Obviously, you can see that it affects iteration and is used for some property path and validation tasks, but I don't know what this actually affects in layman's terms.

[vicb]

see http://odolbeau.fr/use-virtuals-forms-with-symfony2.html

[weaverryan]

That's a great blog post. I think we should have a quick cookbook article on the topic. It's not really a form field option where it makes sense to document it on each field type - I think only a real-use case (like that blog post) in a cookbook makes sense.

Or perhaps @odolbeau would be kind enough to contribute his excellent blog post to the docs, but that's totally up to him :).

[odolbeau]

Of course I can! :)
Should I write a quick cookbook with the same example?

[weaverryan]

@odolbeau yea, a cookbook would be perfect - I really liked the example that you laid on in your blog :)

[richardmiller-zz]

@weaverryan I think this can be closed now as it is covered by GH-1330

[weaverryan]

Thanks Richard :)