is it possible to do a redirect from a Sling Model?

[jayv25585659]

If yes to the question above, how can I do it?

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redirect = I want to redirect the user from page X to page Y based on certain conditions.

I know I can use a filter for this one but just wondering if it can be done from a Sling model. Thank you!

[SantoshSai · Accepted solution]

Hi @jayv25585659,

Yes, technically it is possible to do a redirect from a Sling Model, but it’s not recommended and generally considered bad practice. 

Here is ehy: 

• Sling Models are meant to represent content, provide data for the view, or encapsulate business logic for rendering.

• Redirecting is an HTTP response action, which is a controller-level concern. Doing it from a model mixes responsibilities and can lead to hard-to-maintain code.

If you still want to do it:

import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.models.annotations.Model;
import org.apache.sling.models.annotations.DefaultInjectionStrategy;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

@Model(adaptables = javax.servlet.http.HttpServletRequest.class,
       defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class RedirectModel {

    @Inject
    private SlingHttpServletResponse response;

    @PostConstruct
    protected void init() {
        try {
            boolean someCondition = checkSomeLogic();
            if (someCondition) {
                response.sendRedirect("/content/site/en/pageY.html");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private boolean checkSomeLogic() {
        // your condition logic here
        return true;
    }
}