How to check if nested params exist?

Question

I try to create search with ransack. To do this, I need to check if nested parameters exist.

I get next params:

 Parameters: {"q"=>{"category_id"=>"2", "name_cont"=>"test"}

How can I check if I get params [:category_id] or not?

Answer 1

If you're using Ruby >= 2.3.0, you can make use of Hash#dig:

params.dig(:q, :category_id)