SlingModels: Injecting other Model from SlingHttpServletRequest

Question

One reason for my other question is the following use case: I want to create a TextImageModel which uses my ImageModel as an injected property and extends my TextModel:

@Model(adaptables = {SlingHttpServletRequest.class})
public class TextImageModel extends TextModel {

    @Inject
    private ImageModel image;
}

But this doesn't work. It should work when I would be using Resource as the adaptable, but I need the SlingHttpServletRequest in my ImageModel and TextModel as well:

@Model(adaptables = {SlingHttpServletRequest.class})
public class ImageModel {
    @SlingObject
    private SlingHttpServletRequest request;

    @SlingObject
    private Resource resource;
}

How can I inject the ImageModel using the request as adaptable? The image resource is a child resource with the name image

score 2 · Answer 1 · answered Feb 07 '19 at 11:45

Use the ModelFactory:

    ...
    import com.adobe.cq.wcm.core.components.models.Image;
    import org.apache.sling.models.factory.ModelFactory;
    ...
    @Inject 
    private ModelFactory modelFactory;
    @Self 
    private SlingHttpServletRequest request;

    private Image image;

    @PostConstruct 
    protected void postInit() {
            image = modelFactory.getModelFromWrappedRequest(request, resource.getChild("image"), Image.class);
    ...
    }

That should hopefully do the trick.

rzasap · Answer 2 · 2016-12-02T09:10:57.597

1

You can use @Self instead of @Inject, but you will have the same resource in ImageModel as in TextImageModel. Not child "image" as you would like to. Afaik when adapting from Request, resource will be always read from Request.

@Model(adaptables = {SlingHttpServletRequest.class})
public class TextImageModel extends TextModel {

    @Self
    private ImageModel image;
}

edited Dec 02 '16 at 09:10

answered Dec 02 '16 at 09:00

rzasap

346
1
6

If ImageModel was to be adapted from the Resource, you'd need to add a @Via("request") – Dr. Hans-Peter Störr Sep 14 '17 at 06:57

score 0 · Answer 3 · answered Dec 01 '16 at 11:27

0

If you want to inject from a specific other type than your adaptable then you can use @Inject @Via("resource")

more here: https://sling.apache.org/documentation/bundles/models.html#via

I'm not sure though whether that will work with a model and not a property

answered Dec 01 '16 at 11:27

ub1k

1,674
10
14

See my edit, my ImageModel can only be adapted via SlingHttpServletRequest as I need it in the `@PostConstruct` – Thomas Dec 01 '16 at 11:35
A via would be neccesary when ImageModel was adapted from the resource. As it is, a @Self helps. – Dr. Hans-Peter Störr Sep 14 '17 at 06:56

SlingModels: Injecting other Model from SlingHttpServletRequest

3 Answers3