test: Add test case to show set() many update

example/test_full/models.py

@@ -1,3 +1,4 @@
+from collections import Counter
 from django.db import models
 import sys
 from computedfields.models import ComputedFieldsModel, computed, precomputed, ComputedField
@@ -1107,3 +1108,46 @@ class Meta:
 class HaProxy(Ha):
     class Meta:
         proxy = True
+
+
+class Tag(ComputedFieldsModel):
+    name = models.CharField(max_length=32, unique=True)
+
+
+run_counters = Counter()
+
+
+class Advert(ComputedFieldsModel):
+    name = models.CharField(max_length=32)
+
+    tags = models.ManyToManyField(Tag, related_name="adverts")
+
+    @computed(
+        field=models.CharField(max_length=500),
+        depends=[("tags", ["name"])],
+    )
+    def all_tags(self) -> str:
+        run_counters.update(["all_tags"])
+        if not self.pk:
+            return ""
+        return ", ".join(self.tags.values_list("name", flat=True))
+
+    def __str__(self) -> str:
+        return f"{self.name}"
+
+class Room(ComputedFieldsModel):
+    name = models.CharField(max_length=32)
+    advert = models.ForeignKey(Advert, related_name="rooms", on_delete=models.CASCADE)
+
+    @computed(
+        field=models.BooleanField(),
+        depends=[("advert.tags", ["name"])],
+    )
+    def is_ready(self) -> bool:
+        run_counters.update(["is_ready"])
+        if not self.pk:
+            return False
+        return self.advert.tags.filter(name="ready").exists()
+
+    def __str__(self) -> str:
+        return f"{self.name}"

example/test_full/tests/test_advert_tags.py

@@ -0,0 +1,18 @@
+from django.test import TestCase
+from .. import models
+
+
+class TestAdvertTags(TestCase):
+    def test(self):
+        tag_ready = models.Tag.objects.create(name="ready")
+        advert_1 = models.Advert.objects.create(name="A1")
+        room_11 = models.Room.objects.create(name="R11", advert=advert_1)
+        advert_1.tags.add(tag_ready)
+        advert_2 = models.Advert.objects.create(name="A2")
+        room_21 = models.Room.objects.create(name="R21", advert=advert_2)
+        assert models.run_counters["all_tags"] == 3
+        assert models.run_counters["is_ready"] == 3
+
+        advert_2.tags.add(tag_ready)
+        assert models.run_counters["all_tags"] == 4
+        assert models.run_counters["is_ready"] == 4