added/removed content according to a given Version

https://pulp.plan.io/issues/5706
closes #5706

(cherry picked from commit 420dd1f)

CHANGES/plugin_api/5706.feature

@@ -0,0 +1 @@
+Added an optional parameter base_version to RepositoryVersion add() and removed() methods.

pulpcore/app/models/repository.py

@@ -396,6 +396,17 @@ class Meta:
         get_latest_by = 'number'
         ordering = ('number',)
 
+    def _relationships(self):
+        """
+        Returns a set of repository_content for a repository version
+
+        Returns:
+            django.db.models.QuerySet: The repository_content that is contained within this version.
+        """
+        return RepositoryContent.objects.filter(
+            repository=self.repository, version_added__number__lte=self.number
+        ).exclude(version_removed__number__lte=self.number)
+
     @property
     def content(self):
         """
@@ -415,12 +426,7 @@ def content(self):
             >>>     ...
             >>>
         """
-        relationships = RepositoryContent.objects.filter(
-            repository=self.repository, version_added__number__lte=self.number
-        ).exclude(
-            version_removed__number__lte=self.number
-        )
-        return Content.objects.filter(version_memberships__in=relationships)
+        return Content.objects.filter(version_memberships__in=self._relationships())
 
     def _content_old(self):
         """
@@ -449,19 +455,39 @@ def artifacts(self):
         """
         Artifact.objects.filter(content__pk__in=self.content)
 
-    def added(self):
+    def added(self, base_version=None):
         """
+        Args:
+            base_version (pulpcore.app.models.RepositoryVersion): an optional repository version
+
         Returns:
             QuerySet: The Content objects that were added by this version.
         """
-        return Content.objects.filter(version_memberships__version_added=self)
+        if not base_version:
+            return Content.objects.filter(version_memberships__version_added=self)
+
+        return Content.objects.filter(
+            version_memberships__in=self._relationships()
+        ).exclude(
+            version_memberships__in=base_version._relationships()
+        )
 
-    def removed(self):
+    def removed(self, base_version=None):
         """
+        Args:
+            base_version (pulpcore.app.models.RepositoryVersion): an optional repository version
+
         Returns:
             QuerySet: The Content objects that were removed by this version.
         """
-        return Content.objects.filter(version_memberships__version_removed=self)
+        if not base_version:
+            return Content.objects.filter(version_memberships__version_removed=self)
+
+        return Content.objects.filter(
+            version_memberships__in=base_version._relationships()
+        ).exclude(
+            version_memberships__in=self._relationships()
+        )
 
     def contains(self, content):
         """

pulpcore/tests/unit/models/test_repository.py

@@ -0,0 +1,65 @@
+from itertools import compress
+
+from django.test import TestCase
+from pulpcore.plugin.models import Content, Repository, RepositoryVersion
+
+
+class RepositoryVersionTestCase(TestCase):
+
+    def setUp(self):
+        self.repository = Repository.objects.create()
+        self.repository.CONTENT_TYPES = [Content]
+        self.repository.save()
+
+        contents = []
+        for _ in range(0, 4):
+            contents.append(Content(pulp_type="core.content"))
+
+        Content.objects.bulk_create(contents)
+        self.pks = [c.pk for c in contents]
+
+    def test_add_and_remove_content(self):
+        contents = Content.objects.filter(pk__in=self.pks)
+        with self.repository.new_version() as version1:
+            version1.add_content(contents)  # v1 == all contents
+
+        to_remove = contents[0:2]
+        with self.repository.new_version() as version2:
+            version2.remove_content(to_remove)  # v2 == removed 2 first contents
+
+        to_add = Content.objects.filter(pk=contents[0].pk)
+        with self.repository.new_version() as version3:
+            version3.add_content(to_add)  # v3 == added first content
+
+        version0 = RepositoryVersion.objects.filter(number=0, repository=self.repository).first()
+
+        self.assertEqual(version0.added().count(), 0)
+        self.assertEqual(version1.added().count(), 4)
+        self.assertEqual(version2.added().count(), 0)
+        self.assertEqual(version3.added().count(), 1)
+
+        self.assertEqual(version0.removed().count(), 0)
+        self.assertEqual(version1.removed().count(), 0)
+        self.assertEqual(version2.removed().count(), 2)
+        self.assertEqual(version3.removed().count(), 0)
+
+        self.assertEqual(version3.added(version0).count(), 3)
+        self.assertEqual(version3.removed(version0).count(), 0)
+
+        added_pks_0 = version3.added(version0).values_list('pk', flat=True)
+        removed_pks_0 = version3.removed(version0).values_list('pk', flat=True)
+
+        self.assertCountEqual(added_pks_0, compress(self.pks, [1, 0, 1, 1]), added_pks_0)
+        self.assertCountEqual(removed_pks_0, compress(self.pks, [0, 0, 0, 0]), removed_pks_0)
+
+        added_pks_1 = version3.added(version1).values_list('pk', flat=True)
+        removed_pks_1 = version3.removed(version1).values_list('pk', flat=True)
+
+        self.assertCountEqual(added_pks_1, compress(self.pks, [0, 0, 0, 0]), added_pks_1)
+        self.assertCountEqual(removed_pks_1, compress(self.pks, [0, 1, 0, 0]), removed_pks_1)
+
+        added_pks_2 = version3.added(version2).values_list('pk', flat=True)
+        removed_pks_2 = version3.removed(version2).values_list('pk', flat=True)
+
+        self.assertCountEqual(added_pks_2, compress(self.pks, [1, 0, 0, 0]), added_pks_2)
+        self.assertCountEqual(removed_pks_2, compress(self.pks, [0, 0, 0, 0]), removed_pks_2)