Is there an opposite function of slice function in Ruby?

Question

In this post, slice function is used to get only necessary elements of params. What would be the function I should use to exclude an element of params (such as user_id)?

Article.new(params[:article].slice(:title, :body))

Thank you.

Answer 1

Use except:

a = {"foo" => 0, "bar" => 42, "baz" => 1024 }
a.except("foo")
# returns => {"bar" => 42, "baz" => 1024}

Answer 2

Try this

params = { :title => "title", :other => "other", :body => "body"  }

params.select {|k,v| [:title, :body].include? k  } #=> {:title => "title", :body => "body"}