Parameter type support

[dspaeth-faber]

With grape-swagger issue 49 and 120. some discussion started about responsibilities and parameter types.

Swagger UI supports

• path
• query
• body
• header
• form

as paramter types. For grape all parameters are equal and add's no further information.
grape-swagger walks around this by adding custom options to swagger or use some logic to determine the parameter type.

I would suggest that grape make this kind of parameters too to first class citizens like
it already does for route params and marks the type into the documentation.

Maybe it can also be checked that a query param does not be set via a body param.

[tonobo]

It would be really helpful. +1

[dblock]

👍

[tonobo]

So it would also be nice to setup multiple Parameter types. Currently i had a parser defined which also allows to load the parameters from message body.