I have created a new custom field in the UserEntity and therefore an Assert-Validation with a error message. This Message can be displayed with {{ form_errors(form) }} globally but I haven´t found a way to display the error-message linked to the field without overriding the whole form_theme.
{{ form_errors(form.field_name) }} does not work either
The FOSUserBundle mapps the errors by himself.
My Problem was a typo in the field name in the FormType. It should exactly match the variable name in the Entity
Entity
/**
* Some Comment
*
* @ORM\Column(name="field_name", type="array", nullable=true)
* @Assert\NotBlank(message = "Please select at least one field_name")
*/
protected $fieldName; // Entity variable name
FormType
$builder->add(
'fieldName', // Needs to match Entity variable name
ChoiceType::class,
array(
'choices' => array(
'Some Choice' => '1',
'Other Choice' => '2',
'3rd Choice' => '3',
),
'label' => 'form.register.fieldname',
'translation_domain' => 'user',
'multiple' => true,
'expanded' => true,
'required' => true,
)
);