feature(common): add transformOptions to ValidationPipeOptions

[FionaLovett]

allows plainToClass to expose class properties to defined groups as per issue #1374

PR Checklist

Please check if your PR fulfills the following requirements:

• [ x ] The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• [ x ] Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ x ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

plainToClass has no facility for following rules in Expose decorators regarding groups

Issue Number: 1374

What is the new behavior?

a new property "transformOptions" on the ValidationPipeOptions class is passed into plainToClass so that classes are transformed according to the groups provided.

Does this PR introduce a breaking change?

[ ] Yes
[ x ] No

Other information

[kamilmysliwiec]

It seems that tests are failing (see Travis output). Thanks for the contribution!

[FionaLovett]

Yes, sorry, couldn't run them locally. Got it fixed now, trying to create a new PR. Newbie here!

[coveralls]

Pull Request Test Coverage Report for Build 1358

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 93.777%

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Totals
Change from base Build 1339:	0.003%
Covered Lines:	2853
Relevant Lines:	2976

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💛 - Coveralls

[kamilmysliwiec]

LGTM

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.