!! (a.k.a. the double bang operator) before any statement:
>> @document = Document.new => <Document id: nil, title: nil> >> @document.title => nil >> !!@document.title => false >> @document.title = "My new document" >> !!@document.title => true
In Rails, you can use the name of your attribute followed by a question mark:
>> @document.title? => true >> @document.title = nil >> @document.title? => false
If you want to read more about this, I recommend the following blogposts and their comments:
This tip was submitted by Vladimir Rybas.
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