Fix dynamic rows array serializer in design config

[thomas-kl1]

Description (*)

When using a dynamic rows component in design config, the save fails because when Magento tries to compare current value with the parent one, an error occurs:

TypeError: Magento\Theme\Model\Design\Config\ValueChecker::isEqualArrays(): Argument #2 ($defaultValue) must be of type array, bool given, called in /var/www/project/magento/vendor/magento/module-theme/Model/Design/Config/ValueChecker.php on line 87 and defined in /var/www/project/magento/vendor/magento/module-theme/Model/Design/Config/ValueChecker.php:100

It's because the argument types are array, but the default value is never caster while it could be null, an empty string or a boolean.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] Fix dynamic rows dnd array serializer in design config #38733: Fix dynamic rows dnd array serializer in design config

[m2-assistant]

Hi @thomas-kl1. Thank you for your contribution!
Here are some useful tips on how you can test your changes using Magento test environment.

Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento give me test instance - deploy test instance based on PR changes
• @magento give me 2.4-develop instance - deploy vanilla Magento instance

❗ Automated tests can be triggered manually with an appropriate comment:

• @magento run all tests - run or re-run all required tests against the PR changes
• @magento run <test-build(s)> - run or re-run specific test build(s)
  For example: @magento run Unit Tests

<test-build(s)> is a comma-separated list of build names.

Allowed build names are:

1. Database Compare
2. Functional Tests CE
3. Functional Tests EE
4. Functional Tests B2B
5. Integration Tests
6. Magento Health Index
7. Sample Data Tests CE
8. Sample Data Tests EE
9. Sample Data Tests B2B
10. Static Tests
11. Unit Tests
12. WebAPI Tests
13. Semantic Version Checker

You can find more information about the builds here
ℹ️ Run only required test builds during development. Run all test builds before sending your pull request for review.

---

For more details, review the Code Contributions documentation.
Join Magento Community Engineering Slack and ask your questions in #github channel.

[thomas-kl1]

@magento run all tests

[engcom-Hotel]

@magento create issue