How does the HTTP params Hash work?

[Weston Platter]

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?

[Robert Walker]

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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