Fix Performance Issues

README.md

@@ -74,7 +74,7 @@ To create a GraphQL schema and async executor; for it you simply have to write t
 import graphene
 
 from graphene_mongo import AsyncMongoengineObjectType
-from asgiref.sync import sync_to_async
+from graphene_mongo.utils import sync_to_async
 from concurrent.futures import ThreadPoolExecutor
 
 from .models import User as UserModel

graphene_mongo/converter.py

@@ -285,13 +285,13 @@ async def reference_resolver_async(root, *args, **kwargs):
                             )
                         tasks.append(task)
                     result = await asyncio.gather(*tasks)
-                    result = [each[0] for each in result]
-                    result_object_ids = list()
-                    for each in result:
-                        result_object_ids.append(each.id)
+                    result_object = {}
+                    for items in result:
+                        for item in items:
+                            result_object[item.id] = item
                     ordered_result = list()
                     for each in to_resolve_object_ids:
-                        ordered_result.append(result[result_object_ids.index(each)])
+                        ordered_result.append(result_object[each])
                     return ordered_result
                 return None
 
@@ -350,10 +350,19 @@ def convert_field_to_union(field, registry=None, executor: ExecutorEnum = Execut
     if len(_types) == 0:
         return None
 
-    name = (
-        to_camel_case("{}_{}".format(field._owner_document.__name__, field.db_field)) + "UnionType"
-        if ExecutorEnum.SYNC
-        else "AsyncUnionType"
+    field_name = field.db_field
+    if field_name is None:
+        # Get db_field name from parent mongo_field
+        for db_field_name, _mongo_parent_field in field.owner_document._fields.items():
+            if hasattr(_mongo_parent_field, "field") and _mongo_parent_field.field == field:
+                field_name = db_field_name
+                break
+
+    name = to_camel_case(
+        "{}_{}_union_type".format(
+            field._owner_document.__name__,
+            field_name,
+        )
     )
     Meta = type("Meta", (object,), {"types": tuple(_types)})
     _union = type(name, (graphene.Union,), {"Meta": Meta})

graphene_mongo/fields_async.py

@@ -26,6 +26,7 @@
     find_skip_and_limit,
     get_query_fields,
     sync_to_async,
+    has_page_info,
 )
 
 PYMONGO_VERSION = tuple(pymongo.version_tuple[:2])
@@ -99,6 +100,7 @@ async def default_resolver(self, _root, info, required_fields=None, resolved=Non
         before = args.pop("before", None)
         if before:
             before = cursor_to_offset(before)
+        requires_page_info = has_page_info(info)
         has_next_page = False
 
         if resolved is not None:
@@ -111,7 +113,7 @@ async def default_resolver(self, _root, info, required_fields=None, resolved=Non
                     else:
                         count = None
                 except OperationFailure:
-                    count = len(items)
+                    count = await sync_to_async(len)(items)
             else:
                 count = len(items)
 
@@ -128,7 +130,14 @@ async def default_resolver(self, _root, info, required_fields=None, resolved=Non
                     )
                     items = await sync_to_async(_base_query.limit)(limit)
                     has_next_page = (
-                        len(await sync_to_async(_base_query.skip(limit).only("id").limit)(1)) != 0
+                        (
+                            await sync_to_async(len)(
+                                await sync_to_async(_base_query.skip(limit).only("id").limit)(1)
+                            )
+                            != 0
+                        )
+                        if requires_page_info
+                        else False
                     )
                 elif skip:
                     items = await sync_to_async(items.skip)(skip)
@@ -137,11 +146,12 @@ async def default_resolver(self, _root, info, required_fields=None, resolved=Non
                     if reverse:
                         _base_query = items[::-1]
                         items = _base_query[skip : skip + limit]
-                        has_next_page = (skip + limit) < len(_base_query)
                     else:
                         _base_query = items
                         items = items[skip : skip + limit]
-                        has_next_page = (skip + limit) < len(_base_query)
+                    has_next_page = (
+                        (skip + limit) < len(_base_query) if requires_page_info else False
+                    )
                 elif skip:
                     items = items[skip:]
             iterables = await sync_to_async(list)(items)
@@ -234,24 +244,23 @@ async def default_resolver(self, _root, info, required_fields=None, resolved=Non
                 if reverse:
                     _base_query = items[::-1]
                     items = _base_query[skip : skip + limit]
-                    has_next_page = (skip + limit) < len(_base_query)
                 else:
                     _base_query = items
                     items = items[skip : skip + limit]
-                    has_next_page = (skip + limit) < len(_base_query)
+                has_next_page = (skip + limit) < len(_base_query) if requires_page_info else False
             elif skip:
                 items = items[skip:]
             iterables = items
             iterables = await sync_to_async(list)(iterables)
             list_length = len(iterables)
 
-        if count:
+        if requires_page_info and count:
             has_next_page = (
                 True
                 if (0 if limit is None else limit) + (0 if skip is None else skip) < count
                 else False
             )
-        has_previous_page = True if skip else False
+        has_previous_page = True if requires_page_info and skip else False
 
         if reverse:
             iterables = await sync_to_async(list)(iterables)

graphene_mongo/types.py

@@ -1,20 +1,24 @@
 from collections import OrderedDict
-from concurrent.futures import ThreadPoolExecutor
 
 import graphene
 import mongoengine
-from asgiref.sync import sync_to_async
 from graphene.relay import Connection, Node
-from graphene.types.objecttype import ObjectType, ObjectTypeOptions
 from graphene.types.inputobjecttype import InputObjectType, InputObjectTypeOptions
 from graphene.types.interface import Interface, InterfaceOptions
+from graphene.types.objecttype import ObjectType, ObjectTypeOptions
 from graphene.types.utils import yank_fields_from_attrs
 from graphene.utils.str_converters import to_snake_case
-from graphene_mongo import MongoengineConnectionField
 
+from graphene_mongo import MongoengineConnectionField
 from .converter import convert_mongoengine_field
 from .registry import Registry, get_global_registry, get_inputs_registry
-from .utils import get_model_fields, is_valid_mongoengine_model, get_query_fields, ExecutorEnum
+from .utils import (
+    ExecutorEnum,
+    get_model_fields,
+    get_query_fields,
+    is_valid_mongoengine_model,
+    sync_to_async,
+)
 
 
 def construct_fields(
@@ -241,8 +245,6 @@ async def get_node(cls, info, id):
             required_fields = list(set(required_fields))
             return await sync_to_async(
                 cls._meta.model.objects.no_dereference().only(*required_fields).get,
-                thread_sensitive=False,
-                executor=ThreadPoolExecutor(),
             )(pk=id)
 
         def resolve_id(self, info):

graphene_mongo/types_async.py

@@ -1,6 +1,5 @@
 import graphene
 import mongoengine
-from asgiref.sync import sync_to_async
 from graphene import InputObjectType
 from graphene.relay import Connection, Node
 from graphene.types.interface import Interface, InterfaceOptions
@@ -11,7 +10,7 @@
 from graphene_mongo import AsyncMongoengineConnectionField
 from .registry import Registry, get_global_async_registry, get_inputs_async_registry
 from .types import construct_fields, construct_self_referenced_fields
-from .utils import ExecutorEnum, get_query_fields, is_valid_mongoengine_model
+from .utils import ExecutorEnum, get_query_fields, is_valid_mongoengine_model, sync_to_async
 
 
 def create_graphene_generic_class_async(object_type, option_type):

graphene_mongo/utils.py

@@ -7,7 +7,8 @@
 from typing import Any, Callable, Union
 
 import mongoengine
-from asgiref.sync import SyncToAsync, sync_to_async as asgiref_sync_to_async
+from asgiref.sync import sync_to_async as asgiref_sync_to_async
+from asgiref.sync import SyncToAsync
 from graphene import Node
 from graphene.utils.trim_docstring import trim_docstring
 from graphql import FieldNode
@@ -173,6 +174,28 @@ def get_query_fields(info):
     return query
 
 
+def has_page_info(info):
+    """A convenience function to call collect_query_fields with info
+    for retrieving if page_info details are required
+
+    Args:
+        info (ResolveInfo)
+
+    Returns:
+        bool: True if it received pageinfo
+    """
+
+    fragments = {}
+    if not info:
+        return True  # Returning True if invalid info is provided
+    node = ast_to_dict(info.field_nodes[0])
+    for name, value in info.fragments.items():
+        fragments[name] = ast_to_dict(value)
+
+    query = collect_query_fields(node, fragments)
+    return next((True for x in query.keys() if x.lower() == "pageinfo"), False)
+
+
 def ast_to_dict(node, include_loc=False):
     if isinstance(node, FieldNode):
         d = {"kind": node.__class__.__name__}