Add exclude? method to ActionController::Parameters

[ianneub]

Summary

This pull request adds the exclude? method in ActionController::Parameters. This method is delegated to the hash that backs the parameter data. It is the inverse of include?.

Other Information

Adding this method keeps things a little more consistent with a Hash.

[p8]

Hi @ianneub, thanks for contributing to Rails!

There are more methods from Hash that ActionController::Parameters doesn't support.
Could you provide a use-case for this method that would justify adding the method?

[ianneub]

Could you provide a use-case for this method that would justify adding the method?

Of course. I have a controller that receives an array as a parameter. It loops through this array and will skip an entry if an id was not provided. Currently I use a negated include? to check this, but recently noticed Rubocop suggesting I change that to .exclude?. Rubocop doesn't know that is an instance of ActionController::Parameters.

I could change this to use an empty id parameter, but in this case that would break the API. Not the end of the world. Ultimately this is just a nicety.

Thanks!