code: def get_first(self, filter=None, order_by=None, group_by=[], query_parameters=None, commit=False, async=False, callback=None):
          
          objects = self.get(filter=filter, order_by=order_by, group_by=group_by, page=0, page_size=1, query_parameters=query_parameters, commit=commit)
          return objects[0] if len(objects) else None
docs: Fetch object and directly return the first one
  
              Note:
                  `get_first` won't put the fetched object in the parent's children list.
                  You cannot override this behavior. If you want to commit it in the parent
                  you can use :method:vsdk.NURESTFetcher.fetch or manually add it with
                  :method:vsdk.NURESTObject.add_child
  
              Args:
                  filter (string): string that represents a predicate filter
                  order_by (string): string that represents an order by clause
                  group_by (string): list of names for grouping
                  page (int): number of the page to load
                  page_size (int): number of results per page
                  commit (bool): boolean to update current object
                  callback (function): Callback that should be called in case of a async request
  
              Returns:
                  vsdk.NURESTObject: the first object if any, or None
  
              Example:
                  >>> print entity.children.get_first(filter="name == 'My Entity'")
                  <NUChildren at xxx>