adapt raw_query tests for QuerySet.raw_aggregate()

tests/raw_query/models.py

@@ -1,4 +1,5 @@
 from django_mongodb.fields import ObjectIdAutoField
+from django_mongodb.managers import MongoManager
 
 from django.db import models
 
@@ -8,6 +9,8 @@ class Author(models.Model):
     last_name = models.CharField(max_length=255)
     dob = models.DateField()
 
+    objects = MongoManager()
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         # Protect against annotations being passed to __init__ --
@@ -25,25 +28,35 @@ class Book(models.Model):
     paperback = models.BooleanField(default=False)
     opening_line = models.TextField()
 
+    objects = MongoManager()
+
 
 class BookFkAsPk(models.Model):
     book = models.ForeignKey(
         Book, models.CASCADE, primary_key=True, db_column="not_the_default"
     )
 
+    objects = MongoManager()
+
 
 class Coffee(models.Model):
     brand = models.CharField(max_length=255, db_column="name")
     price = models.DecimalField(max_digits=10, decimal_places=2, default=0)
 
+    objects = MongoManager()
+
 
 class MixedCaseIDColumn(models.Model):
     id = ObjectIdAutoField(primary_key=True, db_column="MiXeD_CaSe_Id")
 
+    objects = MongoManager()
+
 
 class Reviewer(models.Model):
     reviewed = models.ManyToManyField(Book)
 
+    objects = MongoManager()
+
 
 class FriendlyAuthor(Author):
     pass