What is the error in the if condition?

Question

Ruby on Rails

Hello!
I prescribe:

checked: (params[:news][:news][category_ids] if params[:news][:news])

And I get the error:
# undefined method `[]' for nil:NilClass
The same error is caused by this:

<% if params[:news][:news] %>
     # тут что-то
<% end %>

How to fix it? We need to check the existence of the second news in [:news][:news].

Answer 1

Solved the problem like this:
But this is something that really worries me. If there is another, more correct solution, I will be very grateful.