Getting assets from an entry programatically

Question

I want to get the id of an asset I've set for a feature image on an entry.
To find the entry I'm using the slug as the criteria like so:
$entry = Entry::find() 
  ->slug('0002')
  ->one();

In the returned object I'm expecting to see an array somewhere for custom field values listing the asset Id's, but it's drawing a blank
[_behaviors:yiibaseComponent:private] => Array
        (
            [customFields] => craftbehaviorsCustomFieldBehavior Object
                (
                    [hasMethods] => 
                    [summary] => 
                    [featureImage] => 
                    [geopolygon] => [{"col1":"11","col2":"22"},{"col1":"11","col2":"2"},{"col1":"3","col2":"2"},{"col1":"","col2":""}]
                    [_customFieldValues:craftbehaviorsCustomFieldBehavior:private] => Array
                        (
                        )

[owner] => craftelementsEntry Object
 *RECURSION*
                    [_attachedEvents:yiibaseBehavior:private] => Array
                        (
                        )

)

I know this entry does have a featureImage because it shows up in the admin and I can also view it on the frontend. I can also see all other custom values I've saved for the entry. What am I missing here?

MoritzLost · Accepted Answer

In the returned object I'm expecting to see an array somewhere for custom field values listing the asset Id's, but it's drawing a blank

The reason for this is that entry fields are lazy-loaded, meaning Craft only queries the values from the database once you access them using their field handle (or execute the entity query you get through the field handle, like with the asset field). You can change this using Eager-Loading.
Without eager-loading, to get the asset you need to use the field handle (featureImage, in your case) to get an AssetQuery. Then you can use that to get the images (assets) in your field.
$entry = Entry::find() 
  ->slug('0002')
  ->one();

/** @var craftelementsAsset */
$featureImage = $entry->featureImage->one();

$featureImageId = $featureImage->id;

See Working with assets field data and Querying assets. The object returned by AssetQuery::one() is an instance of craftelementsAsset.

Getting assets from an entry programatically

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