Issue #2894634 by amateescu: Allow entity-level validations to flag errors on form elements

core/lib/Drupal/Core/Entity/ContentEntityForm.php

@@ -235,7 +235,7 @@ class ContentEntityForm extends EntityForm implements ContentEntityFormInterface
     // Flag entity level violations.
     foreach ($violations->getEntityViolations() as $violation) {
       /** @var \Symfony\Component\Validator\ConstraintViolationInterface $violation */
-      $form_state->setErrorByName('', $violation->getMessage());
+      $form_state->setErrorByName(str_replace('.', '][', $violation->getPropertyPath()), $violation->getMessage());
     }
     // Let the form display flag violations of its fields.
     $this->getFormDisplay($form_state)->flagWidgetsErrorsFromViolations($violations, $form, $form_state);

core/lib/Drupal/Core/Entity/EntityConstraintViolationList.php

@@ -68,6 +68,11 @@ class EntityConstraintViolationList extends ConstraintViolationList implements E
           if ($this->entity->hasField($field_name)) {
             $this->violationOffsetsByField[$field_name][$offset] = $offset;
           }
+          // If the first part of the violation property path is not a valid
+          // field name, we're dealing with an entity-level validation.
+          else {
+            $this->entityViolationOffsets[$offset] = $offset;
+          }
         }
         else {
           $this->entityViolationOffsets[$offset] = $offset;

core/modules/system/tests/modules/entity_test/src/Plugin/Validation/Constraint/EntityTestEntityLevelValidator.php

@@ -25,6 +25,11 @@ class EntityTestEntityLevelValidator extends ConstraintValidator {
       $this->context->buildViolation($constraint->message)
         ->addViolation();
     }
+    if ($value->name->value === 'entity-level-violation-with-path') {
+      $this->context->buildViolation($constraint->message)
+        ->atPath('test.form.element')
+        ->addViolation();
+    }
   }
 
 }

core/tests/Drupal/KernelTests/Core/Entity/FieldWidgetConstraintValidatorTest.php

@@ -149,6 +149,10 @@ class FieldWidgetConstraintValidatorTest extends KernelTestBase {
 
     $errors = $this->getErrorsForEntity($entity);
     $this->assertEqual($errors[''], 'Entity level validation');
+
+    $entity->name->value = 'entity-level-violation-with-path';
+    $errors = $this->getErrorsForEntity($entity);
+    $this->assertEqual($errors['test][form][element'], 'Entity level validation');
   }
 
 }