mergeCollection handle null values

[s77rt]

@neil-marcellini @chrispader from #437
@marc from Expensify/App#34692

Details

On the above linked PR we made the prepareKeyValuePairsForStorage function remove null values. Removing the null values is only needed for SET operations so we don't have redundant keys e.g. {reportID: 123, nonUsedProp: null, anotherNonUserProp: null}. For MERGE however we need to keep those null values (at the top level) so the provider knows that we want to clear them (at a lower level).

Related Issues

Expensify/App#34692

This is coming from Expensify/App#40254 (comment)

Onyx.merge('report_123', {reportID: 123, participantAccountIDs: [10, 20]}); // have reportID and participantAccountIDs

Onyx.mergeCollection('report_', {'report_123': {participantAccountIDs: null}}) // still have reportID and participantAccountIDs <-- BUG

Onyx.merge('report_123', {participantAccountIDs: null}) // have reportID

Automated Tests

Added a test to verify that nulled key-values on mergeCollection are removed correctly.

Manual Tests

Not needed. mergeCollection is hardly used on /App. It's only used for tests, migrations and stories.

Author Checklist

• I linked the correct issue in the ### Related Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
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  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
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• I verified any variables that can be defined as constants (ie. in CONST.js or at the top of the file that uses the constant) are defined as such
• I verified that if a function's arguments changed that all usages have also been updated correctly
• If a new component is created I verified that:
  • A similar component doesn't exist in the codebase
  • All props are defined accurately and each prop has a /** comment above it */
  • The file is named correctly
  • The component has a clear name that is non-ambiguous and the purpose of the component can be inferred from the name alone
  • The only data being stored in the state is data necessary for rendering and nothing else
  • If we are not using the full Onyx data that we loaded, I've added the proper selector in order to ensure the component only re-renders when the data it is using changes
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• I have checked off every checkbox in the PR author checklist, including those that don't apply to this PR.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

MacOS: Desktop

[s77rt]

The cache having null values in intended #411

[chrispader]

@s77rt this is already being fixed here: https://github.com/Expensify/react-native-onyx/pull/519/files

[s77rt]

Closing in favor of #519