Fix Module slug generation

server/books/models/module.py

@@ -3,12 +3,14 @@ from django.db import models
 from django.utils import timezone
 from django.utils.translation import gettext as _
 from wagtail.admin.forms import WagtailAdminPageForm
-from wagtail.admin.panels import FieldPanel, TabbedInterface, ObjectList
+from wagtail.admin.panels import FieldPanel, TabbedInterface, ObjectList, TitleFieldPanel
 from wagtail.fields import RichTextField
 
+from django.conf import settings
 from core.constants import DEFAULT_RICH_TEXT_FEATURES
 from core.wagtail_utils import StrictHierarchyPage, get_default_settings
 from users.models import SchoolClass
+from django.utils.text import slugify
 
 EXACT = "exact"
 
@@ -54,9 +56,10 @@ class ModuleCategory(models.Model):
 class ModulePageForm(WagtailAdminPageForm):
     def clean(self):
         cleaned_data = super().clean()
+        print("cleaning")
         if "slug" in self.cleaned_data:
             page_slug = cleaned_data["slug"]
-            if not Module._slug_is_available(page_slug, self.instance):
+            if not Module._slug_is_available(page_slug, self.parent_page, self.instance):
                 self.add_error(
                     "slug",
                     forms.ValidationError(
@@ -97,7 +100,7 @@ class Module(StrictHierarchyPage):
     solutions_enabled_for = models.ManyToManyField(SchoolClass)
 
     content_panels = [
-        FieldPanel("title", classname="full title"),
+        TitleFieldPanel("title", classname="full title"),
         FieldPanel("meta_title", classname="full title"),
         FieldPanel("level"),
         FieldPanel("category"),
@@ -106,7 +109,7 @@ class Module(StrictHierarchyPage):
         FieldPanel("teaser"),
         FieldPanel("intro"),
     ]
-    base_form_class = ModulePageForm
+    # base_form_class = ModulePageForm
 
     edit_handler = TabbedInterface(
         [ObjectList(content_panels, heading="Content"), get_default_settings()]
@@ -181,11 +184,42 @@ class Module(StrictHierarchyPage):
         return f"{self.meta_title} - {self.title}"
 
     @staticmethod
-    def _slug_is_available(slug, page):
-        # modeled after `Page._slug_is_available`
-        modules = Module.objects.filter(slug=slug).not_page(page)
+    def _slug_is_available(slug, parent_page, page=None):
+        """
 
-        return not modules.exists()
+        # modeled after `Page._slug_is_available`
+
+        Determine whether the given slug is available for use on a child page of
+        parent_page. If 'page' is passed, the slug is intended for use on that page
+        (and so it will be excluded from the duplicate check).
+        """
+        if parent_page is None:
+            # the root page's slug can be whatever it likes...
+            return True
+
+        modules = Module.objects.all()
+        if page:
+            modules = modules.not_page(page)
+
+        return not modules.filter(slug=slug).exists()
+
+    def _get_autogenerated_slug(self, base_slug):
+        # modeled after `Page._get_autogenerated_slug`
+        candidate_slug = base_slug
+        suffix = 1
+        parent_page = self.get_parent()
+
+        while not self._slug_is_available(candidate_slug, parent_page, self):
+            # try with incrementing suffix until we find a slug which is available
+            suffix += 1
+            candidate_slug = "%s-%d" % (base_slug, suffix)
+        return candidate_slug
+
+    def full_clean(self, *args, **kwargs):
+        super().full_clean(*args, **kwargs)
+
+        if not self._slug_is_available(self.slug, self.get_parent(), self):
+            self.slug = self._get_autogenerated_slug(self.slug)
 
 
 class RecentModule(models.Model):

server/books/tests/test_module_creation.py

@@ -0,0 +1,32 @@
+from django.test import TestCase, RequestFactory
+from unittest import skip
+from graphene.test import Client
+from graphql_relay import to_global_id
+
+from api.schema import schema
+from api.utils import get_object
+from books.models import ContentBlock, Chapter
+from books.factories import ModuleFactory, ModuleLevelFactory, TopicFactory
+from core.factories import UserFactory
+from users.models import User
+
+
+class TestModuleCreation(TestCase):
+    """
+    Since the modules url in the frontend is not  /topic/module but /module the slug has to be unique.
+    This test checks if the slug is generated correctly.
+    """
+
+    def test_create_new_module_generates_slug(self):
+        topic = TopicFactory(title="Berufslehre")
+        module = ModuleFactory(title="Modul 1", parent=topic)
+        self.assertEqual("modul-1", module.slug)
+
+    def test_create_new_module_different_topic(self):
+        topic = TopicFactory(title="Berufslehre")
+        module = ModuleFactory(title="Modul 1", parent=topic)
+
+        topic2 = TopicFactory(title="Geld und Macht")
+        module2 = ModuleFactory(title="Modul 1", parent=topic2)
+        self.assertEqual("modul-1", module.slug)
+        self.assertEqual("modul-1-2", module2.slug, )

server/core/wagtail_utils.py

@@ -2,6 +2,7 @@ from django.contrib import admin
 from wagtail.admin.panels import CommentPanel
 from wagtail.admin.panels import FieldPanel, ObjectList
 from wagtail.models import Page
+from wagtail.admin.widgets.slug import SlugInput
 
 
 class StrictHierarchyPage(Page):
@@ -41,4 +42,4 @@ def wagtail_parent_filter(parent_cls, child_cls):
 
 
 def get_default_settings():
-    return ObjectList([FieldPanel("slug", read_only=True), CommentPanel()], heading="Settings")
+    return ObjectList([FieldPanel("slug", widget=SlugInput), CommentPanel()], heading="Settings")