The issue I have is described here : stackoverflow question

Basically I want to use a custom model in a view that inherits a template. 

Instead of using child actions I am doing route hijacking based on the selected template for a given document type.

More specifically I have a cart template I want to feed a custom model, but I want this cart template to use my master template and I want to do it using route hijacking.

Is the only way really to use child actions, which if I understand it correctly are more to be used for reusable partial views?