Make DjangoDebugContext wait for nested fields (#591)

* Make DjangoDebugContext wait for nested fields

This commit makes DjangoDebugContext wait for all field's promises,
even for fields that only started their resolvers after __debug was
resolved.

Fixes #293.

* Run format

graphene_django/debug/middleware.py

@@ -16,14 +16,18 @@ class DjangoDebugContext(object):
     def get_debug_promise(self):
         if not self.debug_promise:
             self.debug_promise = Promise.all(self.promises)
+            self.promises = []
         return self.debug_promise.then(self.on_resolve_all_promises)
 
     def on_resolve_all_promises(self, values):
+        if self.promises:
+            self.debug_promise = None
+            return self.get_debug_promise()
         self.disable_instrumentation()
         return self.object
 
     def add_promise(self, promise):
-        if self.debug_promise and not self.debug_promise.is_fulfilled:
+        if self.debug_promise:
             self.promises.append(promise)
 
     def enable_instrumentation(self):

graphene_django/debug/tests/test_query.py

@@ -60,6 +60,73 @@ def test_should_query_field():
     assert result.data == expected
 
 
+def test_should_query_nested_field():
+    r1 = Reporter(last_name="ABA")
+    r1.save()
+    r2 = Reporter(last_name="Griffin")
+    r2.save()
+    r2.pets.add(r1)
+    r1.pets.add(r2)
+
+    class ReporterType(DjangoObjectType):
+        class Meta:
+            model = Reporter
+            interfaces = (Node,)
+
+    class Query(graphene.ObjectType):
+        reporter = graphene.Field(ReporterType)
+        debug = graphene.Field(DjangoDebug, name="__debug")
+
+        def resolve_reporter(self, info, **args):
+            return Reporter.objects.first()
+
+    query = """
+        query ReporterQuery {
+          reporter {
+            lastName
+            pets { edges { node {
+              lastName
+              pets { edges { node { lastName } } }
+            } } }
+          }
+          __debug {
+            sql {
+              rawSql
+            }
+          }
+        }
+    """
+    expected = {
+        "reporter": {
+            "lastName": "ABA",
+            "pets": {
+                "edges": [
+                    {
+                        "node": {
+                            "lastName": "Griffin",
+                            "pets": {"edges": [{"node": {"lastName": "ABA"}}]},
+                        }
+                    }
+                ]
+            },
+        }
+    }
+    schema = graphene.Schema(query=Query)
+    result = schema.execute(
+        query, context_value=context(), middleware=[DjangoDebugMiddleware()]
+    )
+    assert not result.errors
+    query = str(Reporter.objects.order_by("pk")[:1].query)
+    assert result.data["__debug"]["sql"][0]["rawSql"] == query
+    assert "COUNT" in result.data["__debug"]["sql"][1]["rawSql"]
+    assert "tests_reporter_pets" in result.data["__debug"]["sql"][2]["rawSql"]
+    assert "COUNT" in result.data["__debug"]["sql"][3]["rawSql"]
+    assert "tests_reporter_pets" in result.data["__debug"]["sql"][4]["rawSql"]
+    assert len(result.data["__debug"]["sql"]) == 5
+
+    assert result.data["reporter"] == expected["reporter"]
+
+
 def test_should_query_list():
     r1 = Reporter(last_name="ABA")
     r1.save()