CODEWITHSUNDEEP
ruby-on-railsruby
prajeesh
prajeesh

Reputation: 2392

Check Presence of multiple params

I need to check the presence of multiple params. Currently what i have written is

if params[:p1].present? && params[:p2].present? && params[:p3].present?
  # Do something
end

Is there a more efficient way to do this?

Upvotes: 9

Views: 4547

Answers (2)

Wand Maker
Wand Maker

Reputation: 18762

In Rails, you can make use of Hash#slice to figure out whether required keys are present in hash.

# Below require is needed only in stand-alone program for testing purposes
require 'active_support/core_ext/hash'

params = {:p1=>"1", :p2=>"2", :p3 => "3", :p4=>"4"}    
mandatory_keys = [:p1, :p2, :p3]

if (params.slice(*mandatory_keys).values.all?(&:present?)
    puts "All mandatory params present"
else
    puts "Mandatory params missing"
end

Upvotes: 1

Simone Carletti
Simone Carletti

Reputation: 176552

You can use the Enumerable.all? method:

%i( p1 p2 p3 ).all? { |key| params[key].present? }

Another alternative, if you need the values, it to fetch them and check the presence.

params.values_at(*%i( p1 p2 p3 )).all?(&:present?)

or

params.values_at(:p1, :p2, :p3).all?(&:present?)

Upvotes: 22

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