Allow getMessage to also pass objects to custom defaultMessageCreator.

[Zagitta]

So this is a small feature request to allow objects to be passed to defaultMessageCreator that would help our use case quite significantly.
To keep a long story short we're internationalizing our validation messages with react-intl by reimplementing the validators we need and passing a custom defaultMessageCreator to createValidator that returns an object instead of a string.
However when trying to internationalize the field parameter passed to defaultMessageCreator we run into an issue where only strings are accepted but the internationalization API requires an object consisting of id and defaultMessage.

This PR fixes that by allowing config.field to be an object while hopefully maintaining backwards compatibility.

Let me know if there's anything blocking this from being merged.

Best regards, Simon.

[jfairbank]

Hi @Zagitta! This seems like a reasonable change. I regret not baking i18n into revalidate already. That could be a useful future feature.

Would you mind adding a unit test for passing in an object to your PR? Fixing the failing typecheck might be more tricky. I don't care to fix that after merging if you're not comfortable with Flow.

Thanks for the PR!

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #46 into master will not change coverage

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[Zagitta]

Alright I've added a test as requested and tried my best to satisfy flow although to be perfectly honest I have no prior experience with it and don't reeeeally know what I'm doing so feel free to improve it 😄

Thanks for a neat little library by the way! It fits nicely together with redux-form 👍

[jfairbank]

No worries. I'll tweak flow as need. Thanks for the changes and the PR!

[jfairbank]

@Zagitta this should be available in v1.1.0 now. Thanks again!

[lauterry]

Thanks @Zagitta and @jfairbank !!