Parent route data depending on child route

[mrlubos]

Hey! I have the following scenario. Parent route A contains an optional child route B. In terms of URLs, A is /foo and B is /foo/$fooId. A on its own is a list of foos. B is a detail view for a single foo.

Here's the fun part. When loading /foo, we fetch one page of foos and render it. However, when loading /foo/$fooId, we want to load n pages of foos until the loaded data either contains $fooId or we run out of pages.

Therefore, I need to access params.fooId in A so we can check the loader against it. How can I do that?