code: def insert(self, collection, doc, callback=None):
          
          self.call("/" + collection + "/insert", [doc], callback=callback)
docs: Insert an item into a collection
  
          Arguments:
          collection - the collection to be modified
          doc - The document to insert. May not yet have an _id attribute,
          in which case Meteor will generate one for you.
  
          Keyword Arguments:
          callback - Optional. If present, called with an error object as the first argument and,
          if no error, the _id as the second.