Commits
-------

e6e3da5 [Validator] Improved test coverage of CollectionValidator and reduced test code duplication
509c7bf [Validator] Moved Optional and Required constraints to dedicated sub namespace.
bf59018 [Validator] Removed @api-tag from Optional and Required constraint, since these two are new.
6641f3e [Validator] Added constraints Optional and Required for the CollectionValidator

Discussion
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[Validator] Improve support for optional/required fields in Collection constraint

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: none
Todo: none

![Travis Build Status](https://secure.travis-ci.org/bschussek/symfony.png?branch=collection-validator)

Improves the `Collection` constraint to test on a more granular level if entries of the collection are optional or required. Before this could only be set using the "allowExtraFields" and "allowMissingFields" options, but these are very general and limited.

The former syntax - without Optional or Required - is still supported.

Usage:

    $array = array(
        'name' => 'Bernhard',
        'birthdate' => '1970-01-01',
    );
    $validator->validate($array, null, new Collection(array(
        'name' => new Required(),
        'birthdate' => new Optional(),
    ));

    // you can also pass additional constraints for the fields
    $validator->validate($array, null, new Collection(array(
        'name' => new Required(array(
            new Type('string'),
            new MinLength(3),
        )),
        'birthdate' => new Optional(new Date()),
    ));

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by canni at 2012-01-15T20:22:17Z

@bschussek I've rewritten a lot of test code for Collection validator in 2.0 branch and also had modified validator itself, as it had a bug #3078, consider waiting with this PR till fabpot will merge 2.0 back into master, as there will be code conflicts :)

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by Koc at 2012-01-15T23:13:04Z

Does it helps to #2615 ?

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by fabpot at 2012-01-16T06:44:53Z

@canni: I've just merged 2.0 into master.

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by bschussek at 2012-01-16T12:05:19Z

@fabpot: Rebased. I also fixed the CS issues mentioned by @stof.