[wp-trac] [WordPress Trac] #54740: REST API: oneOf validation behaves unexpectedly with strings/arrays

[WordPress Trac]

#54740: REST API: oneOf validation behaves unexpectedly with strings/arrays
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 Reporter:  ryelle        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  5.6
 Severity:  normal        |   Keywords:
  Focuses:                |
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 I'm trying to validate block.json files against
 [https://github.com/WordPress/gutenberg/blob/trunk/schemas/json/block.json
 the block.json schema], which uses `oneOf` in a few places
 ([https://github.com/WordPress/gutenberg/blob/b7b62d2d3db4395ce5d2ad42bd1fc0f1c3c2f12d/schemas/json/block.json#L428
 for example, "style"]). Using `rest_validate_value_from_schema`, I end up
 with this error: "[style] matches more than one of the expected formats.".

 I think this is a bug in the validation, because `style` can be one of a
 string or an array of strings, but the code that checks the value
 (`rest_is_array`) converts the string to an array, forcing it to match
 both options.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54740>
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