Unable to use a custom message to be shown as the error flash message

[plandolt]

Environment

Sonata packages

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Direct dependencies required in composer.json:
sonata-project/doctrine-orm-admin-bundle 4.13.0 4.13.0 Integrate Doctrine ORM into the SonataAdminBundle
sonata-project/form-extensions           1.20.0 2.0.0  Symfony form extensions
sonata-project/intl-bundle               3.1.0  3.1.0  Symfony SonataIntlBundle
sonata-project/translation-bundle        3.3.0  3.3.0  SonataTranslationBundle
sonata-project/user-bundle               5.10.0 5.10.0 Symfony SonataUserBundle

Transitive dependencies not required in composer.json:
sonata-project/admin-bundle              4.26.0 4.26.0 The missing Symfony Admin Generator
sonata-project/block-bundle              5.0.1  5.0.1  Symfony SonataBlockBundle
sonata-project/doctrine-extensions       2.3.0  2.3.0  Doctrine2 behavioral extensions
sonata-project/exporter                  3.2.0  3.2.0  Lightweight Exporter library
sonata-project/twig-extensions           2.3.0  2.3.0  Sonata twig extensions

Symfony packages

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Direct dependencies required in composer.json:
symfony/asset                      v6.3.0  v6.3.0  Manages URL generation and versioning of web assets such as CSS stylesheets, JavaScript files and image files
symfony/browser-kit                v6.3.2  v6.3.2  Simulates the behavior of a web browser, allowing you to make requests, click on links and submit forms programmatically
symfony/console                    v6.3.2  v6.3.2  Eases the creation of beautiful and testable command line interfaces
symfony/css-selector               v6.3.2  v6.3.2  Converts CSS selectors to XPath expressions
symfony/debug-bundle               v6.3.2  v6.3.2  Provides a tight integration of the Symfony VarDumper component and the ServerLogCommand from MonologBridge into the Symfony full-stack framework
symfony/doctrine-messenger         v6.3.1  v6.3.1  Symfony Doctrine Messenger Bridge
symfony/dotenv                     v6.3.0  v6.3.0  Registers environment variables from a .env file
symfony/expression-language        v6.3.0  v6.3.0  Provides an engine that can compile and evaluate expressions
symfony/flex                       v2.3.2  v2.3.2  Composer plugin for Symfony
symfony/form                       v6.3.2  v6.3.2  Allows to easily create, process and reuse HTML forms
symfony/framework-bundle           v6.3.2  v6.3.2  Provides a tight integration between Symfony components and the Symfony full-stack framework
symfony/http-client                v6.3.2  v6.3.2  Provides powerful methods to fetch HTTP resources synchronously or asynchronously
symfony/intl                       v6.3.2  v6.3.2  Provides access to the localization data of the ICU library
symfony/mailer                     v6.3.0  v6.3.0  Helps sending emails
symfony/maker-bundle               v1.50.0 v1.50.0 Symfony Maker helps you create empty commands, controllers, form classes, tests and more so you can forget about writing boilerplate code.
symfony/mime                       v6.3.3  v6.3.3  Allows manipulating MIME messages
symfony/monolog-bundle             v3.8.0  v3.8.0  Symfony MonologBundle
symfony/notifier                   v6.3.0  v6.3.0  Sends notifications via one or more channels (email, SMS, ...)
symfony/phpunit-bridge             v6.3.2  v6.3.2  Provides utilities for PHPUnit, especially user deprecation notices management
symfony/process                    v6.3.2  v6.3.2  Executes commands in sub-processes
symfony/property-access            v6.3.2  v6.3.2  Provides functions to read and write from/to an object or array using a simple string notation
symfony/property-info              v6.3.0  v6.3.0  Extracts information about PHP class' properties using metadata of popular sources
symfony/runtime                    v6.3.2  v6.3.2  Enables decoupling PHP applications from global state
symfony/security-bundle            v6.3.3  v6.3.3  Provides a tight integration of the Security component into the Symfony full-stack framework
symfony/serializer                 v6.3.3  v6.3.3  Handles serializing and deserializing data structures, including object graphs, into array structures or other formats like XML and JSON.
symfony/stopwatch                  v6.3.0  v6.3.0  Provides a way to profile code
symfony/string                     v6.3.2  v6.3.2  Provides an object-oriented API to strings and deals with bytes, UTF-8 code points and grapheme clusters in a unified way
symfony/translation                v6.3.3  v6.3.3  Provides tools to internationalize your application
symfony/twig-bundle                v6.3.0  v6.3.0  Provides a tight integration of Twig into the Symfony full-stack framework
symfony/uid                        v6.3.0  v6.3.0  Provides an object-oriented API to generate and represent UIDs
symfony/validator                  v6.3.2  v6.3.2  Provides tools to validate values
symfony/web-link                   v6.3.0  v6.3.0  Manages links between resources
symfony/web-profiler-bundle        v6.3.2  v6.3.2  Provides a development tool that gives detailed information about the execution of any request
symfony/webpack-encore-bundle      v1.17.1 v2.0.1  Integration with your Symfony app & Webpack Encore!
symfony/yaml                       v6.3.3  v6.3.3  Loads and dumps YAML files

Transitive dependencies not required in composer.json:
symfony/cache                      v6.3.2  v6.3.2  Provides extended PSR-6, PSR-16 (and tags) implementations
symfony/cache-contracts            v3.3.0  v3.3.0  Generic abstractions related to caching
symfony/clock                      v6.3.1  v6.3.1  Decouples applications from the system clock
symfony/config                     v6.3.2  v6.3.2  Helps you find, load, combine, autofill and validate configuration values of any kind
symfony/dependency-injection       v6.3.2  v6.3.2  Allows you to standardize and centralize the way objects are constructed in your application
symfony/deprecation-contracts      v3.3.0  v3.3.0  A generic function and convention to trigger deprecation notices
symfony/doctrine-bridge            v6.3.2  v6.3.2  Provides integration for Doctrine with various Symfony components
symfony/dom-crawler                v6.3.1  v6.3.1  Eases DOM navigation for HTML and XML documents
symfony/error-handler              v6.3.2  v6.3.2  Provides tools to manage errors and ease debugging PHP code
symfony/event-dispatcher           v6.3.2  v6.3.2  Provides tools that allow your application components to communicate with each other by dispatching events and listening to them
symfony/event-dispatcher-contracts v3.3.0  v3.3.0  Generic abstractions related to dispatching event
symfony/filesystem                 v6.3.1  v6.3.1  Provides basic utilities for the filesystem
symfony/finder                     v6.3.3  v6.3.3  Finds files and directories via an intuitive fluent interface
symfony/http-client-contracts      v3.3.0  v3.3.0  Generic abstractions related to HTTP clients
symfony/http-foundation            v6.3.2  v6.3.2  Defines an object-oriented layer for the HTTP specification
symfony/http-kernel                v6.3.3  v6.3.3  Provides a structured process for converting a Request into a Response
symfony/messenger                  v6.3.3  v6.3.3  Helps applications send and receive messages to/from other applications or via message queues
symfony/monolog-bridge             v6.3.1  v6.3.1  Provides integration for Monolog with various Symfony components
symfony/options-resolver           v6.3.0  v6.3.0  Provides an improved replacement for the array_replace PHP function
symfony/password-hasher            v6.3.0  v6.3.0  Provides password hashing utilities
symfony/polyfill-intl-grapheme     v1.27.0 v1.27.0 Symfony polyfill for intl's grapheme_* functions
symfony/polyfill-intl-icu          v1.27.0 v1.27.0 Symfony polyfill for intl's ICU-related data and classes
symfony/polyfill-intl-idn          v1.27.0 v1.27.0 Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions
symfony/polyfill-intl-normalizer   v1.27.0 v1.27.0 Symfony polyfill for intl's Normalizer class and related functions
symfony/polyfill-mbstring          v1.27.0 v1.27.0 Symfony polyfill for the Mbstring extension
symfony/polyfill-php83             v1.27.0 v1.27.0 Symfony polyfill backporting some PHP 8.3+ features to lower PHP versions
symfony/polyfill-uuid              v1.27.0 v1.27.0 Symfony polyfill for uuid functions
symfony/routing                    v6.3.3  v6.3.3  Maps an HTTP request to a set of configuration variables
symfony/security-acl               v3.3.2  v3.3.2  Symfony Security Component - ACL (Access Control List)
symfony/security-core              v6.3.3  v6.3.3  Symfony Security Component - Core Library
symfony/security-csrf              v6.3.2  v6.3.2  Symfony Security Component - CSRF Library
symfony/security-http              v6.3.2  v6.3.2  Symfony Security Component - HTTP Integration
symfony/service-contracts          v3.3.0  v3.3.0  Generic abstractions related to writing services
symfony/translation-contracts      v3.3.0  v3.3.0  Generic abstractions related to translation
symfony/twig-bridge                v6.3.2  v6.3.2  Provides integration for Twig with various Symfony components
symfony/var-dumper                 v6.3.3  v6.3.3  Provides mechanisms for walking through any arbitrary PHP variable
symfony/var-exporter               v6.3.2  v6.3.2  Allows exporting any serializable PHP data structure to plain PHP code

PHP version

PHP 8.2.8 (cli) (built: Jul 10 2023 22:45:18) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.8, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.8, Copyright (c), by Zend Technologies

Subject

Cannot use a custom exception in preDelete with the message show up in the red alert flash message.

The PR #7761 was made to allow this behaviour. But after a closer inspection the function handleModelManagerThrowable does not return the message and instead always return null.

[VincentLanglet]

You have to override the handleModelManagerThrowable method if you want to display a custom error message.

[plandolt]

Yeah that worked.