Question

When creating an association using Doctrine 2 and the Zend Framework, if the associated object is empty e.g. for entity->associated_entity->item if associated_entity is empty, i.e. there is not an associated entity to the original entity, then I get an error Trying to get property of non-object.

I know this is because I am trying to get the item from an empty entity.

What is the standard way to avoid this error?

I am using the code below to get the data, but because the initial associated entity will be returned as ”, then it can’t then get the item from ”

public function __get($name) 
{
    if (isset($this->$name)){
        return $this->$name;
    } else {
        return '';
    }
}  

Answer 1

you could try:

$associatedEntity = $entity->associated_entity;

if ($associatedEntity) {
    $item = $associatedEntity->item;
}

Edit:

OK then. Try putting this in your template/view:

<?php
$department = $instruction->department;

if ($department) {
    echo $department->department;
}
?>

Edit 2 (after a small discussion in the chat :D):

I think that there is no way to tell to PHP to stop the chain. E.g.
$object1->object2->attribute
If you write it this way, no matter what you put in the __get(), PHP will assume that object2 is an object and will try to fetch the requested attribute.

The easiest solution would be something like that:

<?php foreach ($this->data as $instruction) : ?>
    <?php if ($dep = $instruction->department) echo $dep->department ?>
<?php endforeach ?>