node.js - Mongoose remove in async.parallel -

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I do not quite understand why this does not work: 

  Remove async parallel ([SomeStuff.find ({}), some stuff 2.find ({}), remove some stuff 3.find ({}}, remove}, done);   
 While it works fine  
  remove async.parallel ([function (callback) {SomeStuff.find ({}) Remove (callback)}, Remove Function (callback) {SomeStuff2.find ({}); (callback);}, function (callback) {SomeStuff3.find ({}) Remove (callback);}];   
 Is not it practically equal? First throws an error:  
  Type error: object # & lt; Object & gt; No method on the query is 'Cast'.     p> 
 
 The problem is that when you pass the function in the same way you lose the function reference.  Remove ()  is a prototype method, so it depends on the value of  this  is correct when you pass by yourself, by  it  value is lost now, so it can no longer talk like  this.cast () .

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