在编辑屏幕中未选中EntityType中的选定选项

Question

I've created a form field in a Symfony 4.2 Web Application based on an EntityType.

But i'm having some issues when editting the entry. The GUID ( i'm using this instead of an regular id ) isn't selected in the dropdown thats generated by an EntityType.

->add('fuel1', EntityType::class, [
                'class' => Chemical::class,
                'choice_label' => 'name',
                'required' => false,
            ])

<option value="0e21313d-847e-4b8f-ab04-1cde3d0281e7">Chemical #1</option>

I expect the option to be selected. The value is correct in the DB, but it seems the data doesn't come through the EntityType.

** EDITTED, added some more code ****

/**
* @ORM\Column(type="string", length=255, nullable=true)
*/
private $fuel_1;

Answer 1

Add 'preferred_choices' in options, setting it to the entity id value if it's set

->add('fuel1', EntityType::class, [
                'class' => Chemical::class,
                'choice_label' => 'name',
                'required' => false,
                'preferred_choices' =>array($builder->getData()->getChemical()->getId() ?? null),
            ])