Revert "PYTHON-4915 - Add guidance on adding _id fields to documents …

…to CRUD …"

This reverts commit 72a5109.

pymongo/message.py

@@ -24,7 +24,6 @@
 import datetime
 import random
 import struct
-from collections import ChainMap
 from io import BytesIO as _BytesIO
 from typing import (
     TYPE_CHECKING,
@@ -1116,18 +1115,8 @@ def _check_doc_size_limits(
         # key and the index of its namespace within ns_info as its value.
         op_doc[op_type] = ns_info[namespace]  # type: ignore[index]
 
-        # Since the data document itself is nested within the insert document
-        # it won't be automatically re-ordered by the BSON conversion.
-        # We use ChainMap here to make the _id field the first field instead.
-        doc_to_encode = op_doc
-        if real_op_type == "insert":
-            doc = op_doc["document"]
-            if not isinstance(doc, RawBSONDocument):
-                doc_to_encode = op_doc.copy()  # type: ignore[attr-defined] # Shallow copy
-                doc_to_encode["document"] = ChainMap(doc, {"_id": doc["_id"]})  # type: ignore[index]
-
         # Encode current operation doc and, if newly added, namespace doc.
-        op_doc_encoded = _dict_to_bson(doc_to_encode, False, opts)
+        op_doc_encoded = _dict_to_bson(op_doc, False, opts)
         op_length = len(op_doc_encoded)
         if ns_doc:
             ns_doc_encoded = _dict_to_bson(ns_doc, False, opts)

test/asynchronous/test_client_bulk_write.py

@@ -18,9 +18,6 @@
 import os
 import sys
 
-from bson import encode
-from bson.raw_bson import RawBSONDocument
-
 sys.path[0:0] = [""]
 
 from test.asynchronous import (
@@ -87,17 +84,6 @@ async def test_formats_write_error_correctly(self):
         self.assertEqual(write_error["idx"], 1)
         self.assertEqual(write_error["op"], {"insert": 0, "document": {"_id": 1}})
 
-    @async_client_context.require_version_min(8, 0, 0, -24)
-    @async_client_context.require_no_serverless
-    async def test_raw_bson_not_inflated(self):
-        doc = RawBSONDocument(encode({"a": "b" * 100}))
-        models = [
-            InsertOne(namespace="db.coll", document=doc),
-        ]
-        await self.client.bulk_write(models=models)
-
-        self.assertIsNone(doc._RawBSONDocument__inflated_doc)
-
 
 # https://github.com/mongodb/specifications/tree/master/source/crud/tests
 class TestClientBulkWriteCRUD(AsyncIntegrationTest):

test/test_client_bulk_write.py

@@ -18,9 +18,6 @@
 import os
 import sys
 
-from bson import encode
-from bson.raw_bson import RawBSONDocument
-
 sys.path[0:0] = [""]
 
 from test import (
@@ -87,17 +84,6 @@ def test_formats_write_error_correctly(self):
         self.assertEqual(write_error["idx"], 1)
         self.assertEqual(write_error["op"], {"insert": 0, "document": {"_id": 1}})
 
-    @client_context.require_version_min(8, 0, 0, -24)
-    @client_context.require_no_serverless
-    def test_raw_bson_not_inflated(self):
-        doc = RawBSONDocument(encode({"a": "b" * 100}))
-        models = [
-            InsertOne(namespace="db.coll", document=doc),
-        ]
-        self.client.bulk_write(models=models)
-
-        self.assertIsNone(doc._RawBSONDocument__inflated_doc)
-
 
 # https://github.com/mongodb/specifications/tree/master/source/crud/tests
 class TestClientBulkWriteCRUD(IntegrationTest):