New in Symfony 6.3: Serializer Debug Command

Contributed by
Loïc Frémont

in #48568.

The Serializer component handles the (de)serialization of data structures,
including object graphs, into array structures or other formats like XML and JSON.
It’s a powerful component but most of its complexity is hidden, which makes it
hard to debug complex situations.

In Symfony 6.2 we added a new Serializer panel to the Symfony profiler to
aid in debugging issues. In Symfony 6.3 we’re adding a another tool to assist you:
the new debug:serializer command.

This command dumps the serializer metadata of a given class, which helps you
find any issues in your metadata configuration:

$ php bin/console debug:serializer ‚AppEntityBook‘

AppEntityBook
—————

+———-+————————————————————+
| Property | Options |
+———-+————————————————————+
| name | [ |
| | „groups“ => [ |
| | „book:read“, |
| | „book:write“, |
| | ] |
| | „maxDepth“ => 1, |
| | „serializedName“ => „book_name“ |
| | „ignore“ => false |
| | „normalizationContexts“ => [], |
| | „denormalizationContexts“ => [] |
| | ] |
| isbn | [ |
| | „groups“ => [ |
| | „book:read“, |
| | ] |
| | „maxDepth“ => null, |
| | „serializedName“ => null |
| | „ignore“ => false |
| | „normalizationContexts“ => [], |
| | „denormalizationContexts“ => [] |
| | ] |
+———-+————————————————————+

This command joins the other built-in debug commands provided by Symfony,
totaling 12 commands:

debug:config „Dump the current configuration for an extension“
debug:container „Display current services for an application“
debug:autowiring „List classes/interfaces you can use for autowiring“
debug:dotenv „Lists all dotenv files with variables and values“
debug:event-dispatcher „Display configured listeners for an application“
debug:router „Display current routes for an application“
debug:serializer „Display serialization information for classes“
debug:translation „Display translation messages information“
debug:validator „Display validation constraints for classes“
debug:form „Display form type information“
debug:firewall „Display information about your security firewall(s)“
debug:twig „Show a list of twig functions, filters, globals and tests“

Do you miss any debug commands? Would you add new options and features to existing
commands? Tell us in the comments.

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