Zagrebelin · December 3, 2020 04:30 · Dec 3, 2020
diff --git a/dataloader.py b/dataloader.py
@@ -0,0 +1,36 @@
+class SimplyDataloader(DataLoader):
+    def batch_load_fn(self, keys):
+        """
+        batch_load_fn accept list of keys and should return list of promises.
+        assert len(keys) == len(promises)
+        It calls only one time, with all the keys from the .load(key) calls.
+        """
+        # heavy calculations will be here. 
+        ret = 5
+        return Promise.resolve([ret])
+
+
+
+class Object(graphene.ObjectType):
+    multiply_2 = graphene.Int()
+    multiply_3 = graphene.Int()
+
+    @classmethod
+    def resolve_multiply_2(cls, root, info, *args, **kwargs):
+        def process_data(data):
+            return data * 2
+
+        return SimplyDataloader().load('').then(process_data)
+
+    @classmethod
+    def resolve_multiply_3(cls, root, info, *args, **kwargs):
+        def process_data(data):
+            return data * 3
+
+        return SimplyDataloader().load('').then(process_data)
+
+# graphene3 will be supporting more fluent async\await interface:
+    @classmethod
+    async def resolve_multiply_3(cls, root, info, *args, **kwargs):
+        data = await SimplyDataloader().load('')
+        returm data * 3
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