Resolve warning of inconsistent result when call LabResults view (#959)

As LabResults is used in a test with pagination, a default ordering is
required to omit warning about unpredictable order.

Author: sliverc

example/migrations/0010_auto_20210714_0809.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.0.9 on 2021-07-14 08:09
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("example", "0009_labresults_author"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="labresults",
+            options={"ordering": ("id",)},
+        ),
+    ]

example/models.py

@@ -169,6 +169,9 @@ class LabResults(models.Model):
         related_name="lab_results",
     )
 
+    class Meta:
+        ordering = ("id",)
+
 
 class Company(models.Model):
     name = models.CharField(max_length=100)