Rails - Aug 2012 - How does the HTTP params Hash work?

I am working on a Rails engine. When I go from a Main Application route to 
an Engine route, I think I lose a HTTP param, which I need for a db query. 

*My questions are,*
*
*
*1) When and how is the HTTP params Hash modified?*
*
*
*2) Is it possible that switching between a application route and engine 
route effects the params Hash?*

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Weston Platter wrote in post #1073624:
> I am working on a Rails engine. When I go from a Main Application route
> to
> an Engine route, I think I lose a HTTP param, which I need for a db
> query.
>
> *My questions are,*
> *
> *
> *1) When and how is the HTTP params Hash modified?*
AFAIK that all happens here in the Rails/Rack middleware stack.

http://guides.rubyonrails.org/rails_on_rack.html#action-controller-middleware-stack

The middleware that parses the user''s data into the params hash is:
ActionDispatch::ParamsParser

At least as I understand it.
> *2) Is it possible that switching between a application route and engine
> route effects the params Hash?*
Sorry, I''ve not yet created a Rails engine so I don''t know the
answer to
this part.

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