callResolver example

if ($resolver === null) {
                continue;
            }

            if ($field instanceof AssociationField) {
                $path[] = $field->getPropertyName();
            }

            $currentPath = implode('.', $path);
            $resolverContext = new FieldResolverContext($currentPath, $alias, $field, $definition, $rootDefinition, $query, $context, $criteriaPart);

            $alias = $this->callResolver($resolverContext);

            if (!$field instanceof AssociationField) {
                return;
            }

            $definition = $field->getReferenceDefinition();
            if ($field instanceof ManyToManyAssociationField) {
                $definition = $field->getToManyReferenceDefinition();
            }

            $parent = $definition->getField('parent');
            

if ($resolver === null) {
                continue;
            }

            if ($field instanceof AssociationField) {
                $path[] = $field->getPropertyName();
            }

            $currentPath = implode('.', $path);
            $resolverContext = new FieldResolverContext($currentPath, $alias, $field, $definition, $rootDefinition, $query, $context, $criteriaPart);

            $alias = $this->callResolver($resolverContext);

            if (!$field instanceof AssociationField) {
                return;
            }

            $definition = $field->getReferenceDefinition();
            if ($field instanceof ManyToManyAssociationField) {
                $definition = $field->getToManyReferenceDefinition();
            }

            if ($definition->isInheritanceAware() && $context->considerInheritance() && $parent = $definition->getField('parent')) {