在Ruby中是否有切片函数的相反功能？

Question

在post中，slice函数用于仅获取必要的参数元素。我应该用什么函数来排除params元素（比如user_id）？

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

谢谢。

Answer 1

使用except：

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

Answer 2

试试这个

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

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