remove auto related parsing, switch to relations on instance instead of relationship manager

tests/test_same_table_joins.py

@@ -79,11 +79,14 @@ async def create_test_database():
     metadata.drop_all(engine)
     metadata.create_all(engine)
     department = await Department.objects.create(id=1, name="Math Department")
+    department2 = await Department.objects.create(id=2, name="Law Department")
     class1 = await SchoolClass.objects.create(name="Math", department=department)
+    class2 = await SchoolClass.objects.create(name="Logic", department=department2)
     category = await Category.objects.create(name="Foreign")
     category2 = await Category.objects.create(name="Domestic")
     await Student.objects.create(name="Jane", category=category, schoolclass=class1)
-    await Student.objects.create(name="Jack", category=category2, schoolclass=class1)
+    await Student.objects.create(name="Judy", category=category2, schoolclass=class1)
+    await Student.objects.create(name="Jack", category=category2, schoolclass=class2)
     await Teacher.objects.create(name="Joe", category=category2, schoolclass=class1)
     yield
     metadata.drop_all(engine)
@@ -100,15 +103,15 @@ async def test_model_multiple_instances_of_same_table_in_schema():
 
         assert len(classes[0].dict().get("students")) == 2
 
-        # related fields of main model are only populated by pk
-        # unless there is a required foreign key somewhere along the way
-        # since department is required for schoolclass it was pre loaded (again)
-        # but you can load them anytime
+        # since it's going from schoolclass => teacher => schoolclass (same class) department is already populated
         assert classes[0].students[0].schoolclass.name == "Math"
         assert classes[0].students[0].schoolclass.department.name is None
         await classes[0].students[0].schoolclass.department.load()
         assert classes[0].students[0].schoolclass.department.name == "Math Department"
 
+        await classes[1].students[0].schoolclass.department.load()
+        assert classes[1].students[0].schoolclass.department.name == "Law Department"
+
 
 @pytest.mark.asyncio
 async def test_right_tables_join():
@@ -130,5 +133,7 @@ async def test_multiple_reverse_related_objects():
             ["teachers__category", "students__category"]
         ).all()
         assert classes[0].name == "Math"
-        assert classes[0].students[1].name == "Jack"
+        assert classes[0].students[1].name == "Judy"
+        assert classes[0].students[0].category.name == "Foreign"
+        assert classes[0].students[1].category.name == "Domestic"
         assert classes[0].teachers[0].category.name == "Domestic"