code: def pbs_for_create(document_path, document_data):
      
      extractor = DocumentExtractor(document_data)
  
      if extractor.deleted_fields:
          raise ValueError("Cannot apply DELETE_FIELD in a create request.")
  
      write_pbs = []
  
      # Conformance tests require skipping the 'update_pb' if the document
      # contains only transforms.
      if extractor.empty_document or extractor.set_fields:
          write_pbs.append(extractor.get_update_pb(document_path, exists=False))
  
      if extractor.has_transforms:
          exists = None if write_pbs else False
          transform_pb = extractor.get_transform_pb(document_path, exists)
          write_pbs.append(transform_pb)
  
      return write_pbs
docs: Make ``Write`` protobufs for ``create()`` methods.
  
      Args:
          document_path (str): A fully-qualified document path.
          document_data (dict): Property names and values to use for
              creating a document.
  
      Returns:
          List[google.cloud.firestore_v1beta1.types.Write]: One or two
          ``Write`` protobuf instances for ``create()``.