AEM - Sling

@yaminikolhe 

Great question—this touches on a subtle but important aspect of how Sling Models resolve dependencies using annotations like @Model and @Self.

Purpose of @Model(adaptables = { ... })

@Model(adaptables = { Resource.class, SlingHttpServletRequest.class })

You're telling Sling Models that this class can be instantiated (adapted) from either a Resource or a SlingHttpServletRequest

So when code like this runs:

modelFactory.getModelFromWrappedRequest(request, MyModel.class);

or

resource.adaptTo(MyModel.class);

It will look for a matching adaptable type and attempt to inject the model.

What does @Self mean then?

The @Self annotation is used on fields or constructor parameters inside the model to inject the same object that was used to adapt the model.

For ex:

@Self
private Resource resource;

Here’s what this does:
- If the model was adapted from a Resource, resource will be injected with that same Resource.
- If the model was adapted from a SlingHttpServletRequest, the framework will try to get a Resource from the request (i.e., request.getResource()) and inject that.

Hope this is clear

Hi,

Please find the detailed explanation in below thread -

https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/what-is-diff-between-self-scriptvariable-and-slingobject/m-p/654480

https://sling.apache.org/documentation/bundles/models.html#available-injectors

Hope this helps

Thanks