ruby on rails - What is a better way to check for a nil object before calling a method on it? -

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I have a call to this method that I want to use ... 

  financial_document .assets length

but financial_document.assets can be zero .

I could use ... 

  financial_document.assets.nil? ? '0': financial_document.assets.length

Is there a repetitive method to do this?

Personally, I use or operator / Keywords: 

  (financial_document.assets or []

By any means, say .length on an array Goes to 0 if zero .


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