UI element added

dokumente/models.py

@@ -54,6 +54,34 @@ class Dokument(models.Model):
     def __str__(self):
         return f"{self.nummer} – {self.name}"
 
+    @property
+    def dates(self):
+        """
+        Returns an array of unique, chronologically sorted dates representing
+        state-change dates from all Vorgaben in this document.
+        
+        These are dates where Vorgaben become active (gueltigkeit_von) or change state
+        (the day after gueltigkeit_bis). The very last date in the list is excluded
+        as it has no relevance (nothing changes after it).
+        """
+        dates_set = set()
+        
+        # Get all vorgaben for this document
+        for vorgabe in self.vorgaben.all():
+            # Add gueltigkeit_von (when vorgabe becomes active)
+            if vorgabe.gueltigkeit_von:
+                dates_set.add(vorgabe.gueltigkeit_von)
+            
+            # Add the day after gueltigkeit_bis (when vorgabe expires/changes state)
+            # Only if gueltigkeit_bis is defined (not None)
+            if vorgabe.gueltigkeit_bis:
+                dates_set.add(vorgabe.gueltigkeit_bis + datetime.timedelta(days=1))
+        
+        # Return sorted unique dates from oldest to newest, excluding the last date
+        # (but only if there are multiple dates; single dates are kept)
+        sorted_dates = sorted(list(dates_set))
+        return sorted_dates[:-1] if len(sorted_dates) > 1 else sorted_dates
+
     class Meta:
         verbose_name_plural="Dokumente"
         verbose_name="Dokument"

dokumente/templates/standards/standard_detail.html

@@ -19,6 +19,25 @@
     <strong>Historische Version vom {{ standard.check_date }}</strong>
   </div>
   {% endif %}
+
+  <!-- History Dates Dropdown -->
+  {% if standard.dates %}
+  <div class="mb-3">
+    <div class="dropdown">
+      <a href="#" class="dropdown-toggle" data-toggle="dropdown" style="text-decoration: none;">
+        📅 Historische Versionen
+      </a>
+      <ul class="dropdown-menu" role="menu">
+        <li><a href="/dokumente/{{ standard.nummer }}/">Aktuelle Version</a></li>
+        <li class="divider"></li>
+        {% for date in standard.dates %}
+        <li><a href="/dokumente/{{ standard.nummer }}/history/{{ date|date:'Y-m-d' }}/">{{ date|date:'d.m.Y' }}</a></li>
+        {% endfor %}
+      </ul>
+    </div>
+  </div>
+  {% endif %}
+
   <!-- Einleitung -->
   {% if standard.einleitung_html %}
   <div class="row mb-4">

dokumente/tests.py

@@ -1792,6 +1792,279 @@ class GetVorgabeCommentsViewTest(TestCase):
         self.assertEqual(response['X-Content-Type-Options'], 'nosniff')
 
 
+class DokumentDatesPropertyTest(TestCase):
+    """Test cases for Dokument.dates property"""
+    
+    def setUp(self):
+        """Set up test data for dates property tests"""
+        self.dokumententyp = Dokumententyp.objects.create(
+            name="Standard IT-Sicherheit",
+            verantwortliche_ve="SR-SUR-SEC"
+        )
+        self.dokument = Dokument.objects.create(
+            nummer="R0066",
+            dokumententyp=self.dokumententyp,
+            name="IT Security Standard",
+            aktiv=True
+        )
+        self.thema = Thema.objects.create(name="Organisation")
+    
+    def test_dates_property_no_vorgaben(self):
+        """Test dates property returns empty list when dokument has no vorgaben"""
+        dates = self.dokument.dates
+        self.assertEqual(dates, [])
+    
+    def test_dates_property_single_vorgabe_with_only_gueltigkeit_von(self):
+        """Test dates property with single vorgabe with only gueltigkeit_von"""
+        vorgabe = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Test Vorgabe",
+            gueltigkeit_von=date(2025, 1, 1)
+        )
+        
+        dates = self.dokument.dates
+        self.assertEqual(len(dates), 1)
+        self.assertEqual(dates[0], date(2025, 1, 1))
+    
+    def test_dates_property_single_vorgabe_with_both_dates(self):
+        """Test dates property with single vorgabe with both gueltigkeit_von and gueltigkeit_bis"""
+        vorgabe = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Test Vorgabe",
+            gueltigkeit_von=date(2025, 1, 1),
+            gueltigkeit_bis=date(2026, 1, 1)
+        )
+        
+        dates = self.dokument.dates
+        # gueltigkeit_bis would add 2026-01-02, but that's the last date so it's excluded
+        self.assertEqual(len(dates), 1)
+        self.assertEqual(dates[0], date(2025, 1, 1))
+    
+    def test_dates_property_multiple_vorgaben_different_dates(self):
+        """Test dates property with multiple vorgaben with different dates"""
+        vorgabe1 = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 1",
+            gueltigkeit_von=date(2025, 1, 1),
+            gueltigkeit_bis=date(2025, 6, 30)
+        )
+        
+        vorgabe2 = Vorgabe.objects.create(
+            order=2,
+            nummer=2,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 2",
+            gueltigkeit_von=date(2025, 7, 1),
+            gueltigkeit_bis=date(2026, 1, 1)
+        )
+        
+        dates = self.dokument.dates
+        # Dates: 2025-01-01, 2025-07-01, 2026-01-02 (but last one excluded)
+        self.assertEqual(len(dates), 2)
+        self.assertIn(date(2025, 1, 1), dates)  # Start of vorgabe1
+        self.assertIn(date(2025, 7, 1), dates)  # End of vorgabe1 + 1 day = Start of vorgabe2 (deduplicated)
+    
+    def test_dates_property_ensures_uniqueness(self):
+        """Test dates property returns unique dates only"""
+        # Create two vorgaben with overlapping dates
+        vorgabe1 = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe A",
+            gueltigkeit_von=date(2025, 1, 1),
+            gueltigkeit_bis=date(2026, 1, 1)
+        )
+        
+        vorgabe2 = Vorgabe.objects.create(
+            order=2,
+            nummer=2,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe B",
+            gueltigkeit_von=date(2025, 1, 1),  # Same start date
+            gueltigkeit_bis=date(2026, 1, 1)   # Same end date
+        )
+        
+        dates = self.dokument.dates
+        # Both vorgaben have same dates, and the last date (2026-01-02) is excluded
+        self.assertEqual(len(dates), 1)
+        self.assertEqual(dates[0], date(2025, 1, 1))
+    
+    def test_dates_property_sorted_chronologically(self):
+        """Test dates property returns dates sorted from oldest to newest"""
+        # Create vorgaben in non-chronological order
+        vorgabe1 = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 1",
+            gueltigkeit_von=date(2026, 1, 1)
+        )
+        
+        vorgabe2 = Vorgabe.objects.create(
+            order=2,
+            nummer=2,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 2",
+            gueltigkeit_von=date(2024, 1, 1)
+        )
+        
+        vorgabe3 = Vorgabe.objects.create(
+            order=3,
+            nummer=3,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 3",
+            gueltigkeit_von=date(2025, 1, 1)
+        )
+        
+        dates = self.dokument.dates
+        # Dates are [2024-01-01, 2025-01-01, 2026-01-01] but the last one is excluded
+        self.assertEqual(len(dates), 2)
+        self.assertEqual(dates[0], date(2024, 1, 1))
+        self.assertEqual(dates[1], date(2025, 1, 1))
+    
+    def test_dates_property_ignores_none_dates(self):
+        """Test dates property ignores None date values"""
+        vorgabe1 = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 1",
+            gueltigkeit_von=date(2025, 1, 1)
+            # No gueltigkeit_bis (None)
+        )
+        
+        vorgabe2 = Vorgabe.objects.create(
+            order=2,
+            nummer=2,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe 2",
+            gueltigkeit_von=date(2026, 1, 1),
+            gueltigkeit_bis=None  # Explicitly None
+        )
+        
+        dates = self.dokument.dates
+        # Dates are 2025-01-01 and 2026-01-01, but the last date (2026-01-01) is excluded
+        self.assertEqual(len(dates), 1)
+        self.assertEqual(dates[0], date(2025, 1, 1))
+    
+    def test_dates_property_complex_scenario(self):
+        """Test dates property with complex real-world scenario
+        
+        Vorgabe A: 2025-01-01 to 2025-12-31
+        Vorgabe B: 2025-06-01 to 2026-01-01  (overlaps with A)
+        Vorgabe C: 2026-02-01 to None        (no end date)
+        
+        Expected dates: [2025-01-01, 2025-06-01, 2025-12-31, 2026-01-01, 2026-02-01]
+        The middle date (2026-01-01) should NOT be excluded even though B overlaps with A
+        """
+        vorgabe_a = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe A",
+            gueltigkeit_von=date(2025, 1, 1),
+            gueltigkeit_bis=date(2025, 12, 31)
+        )
+        
+        vorgabe_b = Vorgabe.objects.create(
+            order=2,
+            nummer=2,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe B",
+            gueltigkeit_von=date(2025, 6, 1),
+            gueltigkeit_bis=date(2026, 1, 1)
+        )
+        
+        vorgabe_c = Vorgabe.objects.create(
+            order=3,
+            nummer=3,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Vorgabe C",
+            gueltigkeit_von=date(2026, 2, 1)
+            # No gueltigkeit_bis
+        )
+        
+        dates = self.dokument.dates
+        # All dates: 2025-01-01, 2025-06-01, 2026-01-01, 2026-01-02, 2026-02-01
+        # Last date (2026-02-01) is excluded
+        expected = [
+            date(2025, 1, 1),   # Start of A
+            date(2025, 6, 1),   # Start of B
+            date(2026, 1, 1),   # End of A + 1 day
+            date(2026, 1, 2)    # End of B + 1 day
+        ]
+        
+        self.assertEqual(dates, expected)
+    
+    def test_dates_property_returns_list(self):
+        """Test dates property returns a list (not a set or tuple)"""
+        vorgabe = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Test Vorgabe",
+            gueltigkeit_von=date(2025, 1, 1)
+        )
+        
+        dates = self.dokument.dates
+        self.assertIsInstance(dates, list)
+    
+    def test_dates_property_does_not_persist_to_database(self):
+        """Test dates property is calculated on-the-fly, not stored"""
+        vorgabe = Vorgabe.objects.create(
+            order=1,
+            nummer=1,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Test Vorgabe",
+            gueltigkeit_von=date(2025, 1, 1),
+            gueltigkeit_bis=date(2025, 12, 31)
+        )
+        
+        # Get dates before adding new vorgabe
+        dates_before = self.dokument.dates
+        self.assertEqual(len(dates_before), 1)  # 2025-01-01 (2026-01-02 is last, so excluded)
+        
+        # Add new vorgabe
+        vorgabe2 = Vorgabe.objects.create(
+            order=2,
+            nummer=2,
+            dokument=self.dokument,
+            thema=self.thema,
+            titel="Test Vorgabe 2",
+            gueltigkeit_von=date(2026, 2, 1)
+        )
+        
+        # Get dates after - new dates are 2025-01-01, 2026-01-02, 2026-02-01
+        # Last date (2026-02-01) is excluded, so we get [2025-01-01, 2026-01-01]
+        dates_after = self.dokument.dates
+        self.assertEqual(len(dates_after), 2)
+        self.assertEqual(dates_after[0], date(2025, 1, 1))
+        self.assertEqual(dates_after[1], date(2026, 1, 1))
+
+
 class AddVorgabeCommentViewTest(TestCase):
     """Test cases for add_vorgabe_comment view"""
     
@@ -2562,3 +2835,4 @@ class AllCommentsViewTest(TestCase):
         # Both users' comments on the same vorgabe should be visible
         self.assertEqual(response.context['total_comments'], 4)
 
+