document: add to_json convert method

mdocument/document.py

@@ -270,10 +270,10 @@ class Document(metaclass=MetaDocument):
 
     @classmethod
     @check_setup
-    async def many(cls, **kwargs) -> list:
+    async def many(cls, **kwargs) -> DocumentArray:
         """Finds multiple documents based on kwargs."""
 
-        result_list = []
+        result_list = DocumentArray()
         cursor = cls.collection.find(kwargs)
         async for doc in cursor:
             result_list.append(cls(**doc))
@@ -344,3 +344,10 @@ class Document(metaclass=MetaDocument):
             return result
 
         return func_wrapper
+
+    def to_json(self):
+        _id = self._id
+        result = {"_id": str(self._document_.__data__.pop("_id"))}
+        result.update(self._document_.__data__)
+        self._document_["_id"] = _id
+        return result

tests/document_test.py

@@ -352,3 +352,23 @@ async def test_create_indexes(client):
     }
     indexes = await Video.collection.index_information()
     assert indexes.get("user_1_value_1") == user_1_value_1
+
+
+@pytest.mark.asyncio
+async def test_to_json(client):
+
+    test_client = client
+
+    class Video(Document):
+        client = test_client
+        collection = "videos"
+        database = "mdocument"
+
+    video = await Video.create(name="movie", awards=3, bytes=b"123")
+
+    assert video.to_json() == {
+        "_id": str(video._id),
+        "name": "movie",
+        "awards": 3,
+        "bytes": b"123",
+    }