Allow Closure for `setValue`

[oleg-andreyev]

Short description of what this feature will allow to do: There are cases such as external files (VichUploaderBundle) where database stores only part of path, but for admin purposes we need to resolve full url.

• We cannot create getter in Entity, because it requires as service.
• We cannot pass \Closure because it does not allow

Example of how to use this feature By passing \Closure, it will allow to format/modify value on list/index action as we need.

Current Workaround

        yield UrlField::new('file_path')
            ->formatValue(fn ($value, $entity) => $this->storage->resolveUri($entity))
            ->setValue(new class ($this->storage) implements \Stringable {
                private array $instances = [];

                public function __construct(private readonly StorageInterface $storage)
                {
                }

                public function __toString(): string
                {
                    $trace = debug_backtrace(limit: 3);
                    $caller = $trace[1];
                    $args = $caller['args'];
                    $entityDto = $args[1];

                    if ($entityDto instanceof EntityDto) {
                        $this->instances[spl_object_id($entityDto)] = $entityDto->getInstance();
                    } else {
                        $caller = $trace[2];
                        $args = $caller['args'];
                        $entityDto = $args[0]['entity'];
                    }

                    return $this->storage->resolveUri($this->instances[spl_object_id($entityDto)]);
                }
            })
        ;

[oleg-andreyev]

Another example: I want to apply \Doctrine\SqlFormatter\SqlFormatter on SQL code from entity, but I don't want to "keep" this code in entity...

so another sh*tty workaround

            yield CodeEditorField::new('executableSelector')
                ->setHelp('For developers')
                ->setDisabled()
                ->setLanguage('sql')
                // @see https://github.com/EasyCorp/EasyAdminBundle/issues/5940
                ->setFormTypeOption('data', new class implements \Stringable {
                    public function __toString(): string
                    {
                        $trace = debug_backtrace(limit: 3);
                        $caller = $trace[2];
                        assert(isset($caller['args']));

                        $args = $caller['args'];
                        $form = $args[0]['form'];
                        assert($form instanceof FormView);

                        $data = $form->parent->vars['data'];
                        assert($data instanceof Category);

                        return (new SqlFormatter(new NullHighlighter()))->format($data->getExecutableSelector());
                    }
                })
            ;

[Troi]

I have almost same issue here https://github.com/EasyCorp/EasyAdminBundle/issues/6176

I think this isn't so obscure issue and it should be possible in some meaningfully easy way.