Add Nested definition to support nested result structures - #13
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Closes #6. Adds a new `Definition\Nested` that resolves one or more queries against a sub-source (navigated to via any other definition, typically a Path). Depending on whether the navigation resolves to a single object or a collection, it returns a nested associative array or a list of nested associative arrays, and can be composed to build arbitrarily deep structures. Propagates UnresolvedValue so optional() navigation still omits the key as expected.
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Summary
Lemonade\ObjectQuery\Definition\Nested, a newDefinitionInterfaceimplementation that lets a query return a nested data structure instead of only flat scalars.Nestednavigates to a sub-source via any other definition (typically aPath), then applies its own set of queries to it:UnresolvedValuefrom anoptional()navigation propagates correctly, so the key is omitted from the result set as usual.Nesteddefinitions can be nested inside each other to build arbitrarily deep structures.Closes #6.
Test plan
composer tests:all(phpunit, 21 tests / 23 assertions, all green)composer lint:all(phpcs PSR12 + phpstan level 8, no errors)