Is there an opposite function of slice function in Ruby?
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15-04-2021 - |
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.
Solution
Use except:
a = {"foo" => 0, "bar" => 42, "baz" => 1024 }
a.except("foo")
# returns => {"bar" => 42, "baz" => 1024}
OTHER TIPS
Try this
params = { :title => "title", :other => "other", :body => "body" }
params.select {|k,v| [:title, :body].include? k } #=> {:title => "title", :body => "body"}
Inspired in the sourcecode of except in Rails' ActiveSupport
You can do the same without requiring active_support/core_ext/hash/except
# h.slice( * h.keys - [k1, k2...] )
# Example:
h = { a: 1, b: 2, c: 3, d: 4 }
h.slice( * h.keys - [:b, :c] ) # => { a: 1, d: 4}
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