ruby - Rails+MongoDB: Find ObjectId bigger than given value -

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I am trying to find the next (latest) document in MongoDB: 

  Article.find ({'_id' => gt; {"$ gt" = & gt; Mopped :: BSON :: Object ID (id_from_database)}}   
 But every time I I get this query, I get it  
  Problem: Document (s) not found for class article with id (s) {"_id" => {"$ gt "= & Gt;" Value given "}}.   
 I have installed these gems:  
  Mani 'monogoid' mani 'BSN' mani 'BSANIX'   
 But still the problem is not found ... I would be grateful for every help!  
 Thanks  < / Div> 
 
 
 the following object  
  article.where ({: _ id = & gt; { $ {Gt = & gt; id_from_database}}. Sort ({: _ id = & gt; 1}). First

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