CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-4
Tarlen
Tarlen

Reputation: 3797

Check if class has nested class?

Say I have a class XXXPriceDocument that may have an inner class LargePackageCharge, how can I check if it does?

Upvotes: 1

Views: 298

Answers (1)

BroiSatse
BroiSatse

Reputation: 44675

You can do:

XXXPriceDocument.constants.include?(:LargePackageCharge)

or

defined?(XXXPriceDocument::LargePackageCharge)

or

XXXPriceDocument.const_defined?(:LargePackageCharge)

It gets slightly trickier in rails, as constants may not be loaded yet. You will need to get around this with:

class Module
  def const_exists?(mod)
    !!const_get(mod) 
  rescue NameError
    false
  end
end

XXXPriceDocument.const_exists?(:LargePackageCharge)

Upvotes: 6

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