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Is it possible to change the component that has to be rendered as a component presentation in java dxa 1.2. For example, if an Article component with id tcm:5-100 is inserted on the page with Article CT.

During the component presentations rendering in delivery, can I replace the existing component with a different Article component with id tcm:5-101 which I have fetched through broker API based on particular metadata field value.

If it is possible please guide me with the method that has to be extended/ modified if required.

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  • @Bart pointed out you could get (Dynamic) Component Presentations using DD4T calls/methods in a DXA setup. Would this work for you?
    – Alvin Reyes
    Commented Apr 5, 2019 at 15:46
  • Thanks Alvin, this article helped me to understand about dd4t api method used to retrieve the component presentation but how can I add this back to the page in place of existing component presentation?
    – user3113876
    Commented Apr 5, 2019 at 17:20
  • Can you elaborate on why you want to do this?
    – Rick Pannekoek
    Commented Apr 5, 2019 at 20:05
  • @Rick, I am looking for this because I want to display user specific article based on a value received from third party service. The value which is received for a user is stored during content creation in article components. I will fetch this matched article component through broker api and I want to display this in place of default article which is inserted on page.
    – user3113876
    Commented Apr 6, 2019 at 3:15
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    Yes Alvin. You are right it is personalized content for users. But I am not hardcoding tcm uri, I am fetching tcm uri through broker api based on a value which is received from third party service.
    – user3113876
    Commented Apr 7, 2019 at 3:16

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Like Alvin already mentioned, your requirements sound quite similar to what Experience Optimization does; you may want to take a look at the XO/SmartTarget Module to see how this kind of functionality is implemented there.

Spoiler: the XO/SmartTarget Module leverages the concept of Regions and can dynamically populate "SmartTarget Regions" with the results from an XO Query; if the query yields no results, it will keep fallback content coming from CM (if any). Technically speaking, the XO/SmartTarget Module uses a so-called Page Model Builder to dynamically inject Entity Models in the SmartTarget Region Models.

Another common way to dynamically modify View Models is using a custom Entity Controller. You already mentioned you have a Component Presentation (Entity Model in DXA speak) which represents a placeholder to be personalized. With a custom Entity Controller, you can dynamically post-process this Entity Model (if needed, it can even completely replace the Entity Model with another, based on a dynamic query).

Several DXA Modules have custom Entity Controllers. For example, the Search Module has a SearchController.

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