ruby on rails - order by foreign key in activerecord -

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मेरे पास तालिकाओं Foo और बार है। फ़ू में एक बार है। जब मैं Foo क्वेरी करता हूं, तो मैं इसे बार तालिका में दिनांक कॉलम से कैसे आदेश कर सकता / सकती हूं?

धन्यवाद

< P> 
  Foo.find (: सभी,: joins = & gt;: boo,: order = & gt; bars.created_at DESC)

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