Hello,

I needed to filter a "data" parameter for one of my controllers, but this 
is a very generic word, so I didn't really want to filter every instance of 
this key for all of my controllers.

The current implementation of "config.filter_parameters" was not flexible 
enough for me to write this kind of custom logic. So I wrote a monkey patch 
for 'action_dispatch/http/parameter_filter', and added the concept 
of CustomFilter classes (name needs some work.) My idea is that you can 
create a subclass from ActionDispatch::Http::ParameterFilter::CustomFilter, 
and then write a custom filter method that receives the params Hash, and 
returns a filtered hash.

I use this to look at the "controller" and "action" keys, so I can set up 
different filtering for different controllers.

Here is a Gist with the code that I'm using: 
https://gist.github.com/ndbroadbent/0f9e01af5f03be81580e7792e85ffbb7

I think this does the job for my application, so I wanted to see if this 
might be useful for other people. If so, I would be happy to work on a PR.


Thanks,
Nathan

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