Sling model two adapters, adapt problems

Forum|Forum|7 years ago
November 29, 2018
8 replies
9684 views

Hi,

I have a sling model with both SlingHttpServletRequest and Resource as adaptables.

Couple of questions there.

1. I think the default adaptable is request (has the higher priority) since for any inject which depends on resource being the adaptable does not work until i put a Via("resource") there. Is this understanding correct?

2. When I adapt a resource (another model in the same component called from the same HTL file) to the model above, it throws (Suppressed: org.apache.sling.models.factory.MissingElementException: Could not inject private java.lang.String org.yadhu.core.test.MyComponent.parameter1). Basically it is asking me to make all those Injects optional which depend on request being adaptable. is this the expected behavior? Does this mean that whenever i have a model which has two adapters i need to make everything optional as I could potentially adapt both resource and request? please let me know.

thanks in advance all experts!

Yadhu

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Best answer by arunpatidar

In some cases, a different object should be used as the adaptable instead of the original adaptable. This can be done using the @Via annotation. By default, this can be done using a JavaBean property of the adaptable:

@Model(adaptables=SlingHttpServletRequest.class) public interface MyModel {  // will return request.getResource().getValueMap().get("propertyName", String.class) @Inject @Via("resource") String getPropertyName(); }

A different strategy can be used to define the adaptable by specifying a type attribute:

@Model(adaptables=Resource.class) public interface MyModel {  // will return resource.getChild("jcr:content").getValueMap().get("propertyName", String.class) @Inject @Via(value = "jcr:content", type = ChildResource.class) String getPropertyName();  }

I am not sure about your second point, can you check below article where there is no optional annotation used

Performing Sling Model Adaptation Using Request and Resource Objects

arunpatidar

Accepted solution

Community Advisor

In some cases, a different object should be used as the adaptable instead of the original adaptable. This can be done using the @Via annotation. By default, this can be done using a JavaBean property of the adaptable:

@Model(adaptables=SlingHttpServletRequest.class) public interface MyModel {  // will return request.getResource().getValueMap().get("propertyName", String.class) @Inject @Via("resource") String getPropertyName(); }

A different strategy can be used to define the adaptable by specifying a type attribute:

@Model(adaptables=Resource.class) public interface MyModel {  // will return resource.getChild("jcr:content").getValueMap().get("propertyName", String.class) @Inject @Via(value = "jcr:content", type = ChildResource.class) String getPropertyName();  }

I am not sure about your second point, can you check below article where there is no optional annotation used

Performing Sling Model Adaptation Using Request and Resource Objects

Arun Patidar