#302 Slugify tags with theirs groups

catalog/models.py

@@ -210,6 +210,9 @@ def get_siblings(self, offset):
 # is not arch design, but about ORM hack.
 class TagGroup(models.Model):
 
+    SLUG_HASH_SIZE = 5
+    SLUG_MAX_LENGTH = 25
+
     class Meta:
         abstract = True
 
@@ -220,6 +223,28 @@ class Meta:
         default=0, blank=True, db_index=True, verbose_name=_('position'),
     )
 
+    # @todo #302:30m  Resolve slug code doubling.
+    #  See `TagGroup.slug` and `Tag._get_slug`.
+    @property
+    def slug(self) -> str:
+        """Make a slug from the name."""
+        # Translate all punctuation chars to "_".
+        # It doesn't conflict with `slugify`, which translate spaces to "-"
+        # and punctuation chars to "".
+        slug = slugify(unidecode(self.name.translate(
+            {ord(p): '_' for p in string.punctuation}
+        )))
+
+        # Keep the slug length less then SLUG_MAX_LENGTH
+        if len(slug) < self.SLUG_MAX_LENGTH:
+            return slug
+
+        slug_length = self.SLUG_MAX_LENGTH - self.SLUG_HASH_SIZE - 1
+        return randomize_slug(
+            slug[:slug_length],
+            hash_size=self.SLUG_HASH_SIZE
+        )
+
     def __str__(self):
         return self.name
 
@@ -401,15 +426,16 @@ class Meta:
     def __str__(self):
         return self.name
 
-    def _slugify(self) -> None:
-        """Make a slug from the name."""
+    def _get_slug(self) -> str:
         # Translate all punctuation chars to "_".
         # It doesn't conflict with `slugify`, which translate spaces to "-"
         # and punctuation chars to "".
         slug = slugify(unidecode(self.name.translate(
             {ord(p): '_' for p in string.punctuation}
         )))
 
+        slug = '__'.join([self.group.slug, slug])
+
         # Keep the slug length less then SLUG_MAX_LENGTH
         if len(slug) < self.SLUG_MAX_LENGTH:
             return slug
@@ -422,7 +448,7 @@ def _slugify(self) -> None:
 
     def save(self, *args, **kwargs):
         if not self.slug:
-            self.slug = self._slugify()
+            self.slug = self._get_slug()
         super(Tag, self).save(*args, **kwargs)
 
     # @todo #168:15m Move `Tags.parse_url_tags` Tags context.

tests/catalog/test_models.py

@@ -1,5 +1,6 @@
 """Defines tests for models in Catalog app."""
 import string
+import unittest
 
 from django.db import DataError
 from django.test import TestCase
@@ -249,14 +250,15 @@ class Tag(TestCase):
 
     def test_tag_doubled_save_slug_postfix(self):
         """Tag should preserve it's slug value after several saves."""
+        slug = '12-v'
         group = catalog_models.MockTagGroup.objects.create(name='Напряжение вход')
         tag = catalog_models.MockTag.objects.create(
             name='12 В',
             group=group
         )
-        self.assertEqual(tag.slug, '12-v')
+        self.assertEqual(tag.slug[-len(slug):], slug)
         tag.save()
-        self.assertEqual(tag.slug, '12-v')
+        self.assertEqual(tag.slug[-len(slug):], slug)
 
     def test_long_name(self):
         """
@@ -266,21 +268,45 @@ def test_long_name(self):
         It may create problems for tag with long name.
         """
         name = 'Имя ' * 50
-        group = catalog_models.MockTagGroup.objects.first()
+        group = catalog_models.MockTagGroup.objects.create(name='Some group')
         try:
             tag = catalog_models.MockTag.objects.create(group=group, name=name)
             self.assertLessEqual(len(tag.slug), catalog.models.Tag.SLUG_MAX_LENGTH)
         except DataError as e:
             self.assertTrue(False, f'Tag has too long name. {e}')
 
     def test_slugify_conflicts(self):
+        group = catalog_models.MockTagGroup.objects.create(name='Some group')
         slugs = [
-            catalog_models.MockTag.objects.create(name=name).slug
+            catalog_models.MockTag.objects.create(group=group, name=name).slug
             for name in ['11 A', '1/1 A', '1 1 A']
         ]
 
         self.assertEqual(len(slugs), len(set(slugs)), msg=slugs)
 
+    # @todo #302:30m  Process more special symbols for slugs.
+    @unittest.expectedFailure
+    def test_slug_special_symbols(self):
+        slugs = [
+            catalog_models.MockTag.objects.create(name=name).slug
+            for name in ['11 A', '1/1 A', '1 1 A', '1.1 A', '1-1 A', '1_1 A']
+        ]
+
+        self.assertEqual(len(slugs), len(set(slugs)), msg=slugs)
+
+    def test_slugs_for_cloned_tag_values(self):
+        groups = [
+            catalog_models.MockTagGroup.objects.create(name=name)
+            for name in ['Length', 'Width', 'Height']
+        ]
+        values = ['11 A']*3
+        slugs = [
+            catalog_models.MockTag.objects.create(group=group, name=value).slug
+            for group, value in zip(groups, values)
+        ]
+
+        self.assertEqual(len(slugs), len(set(slugs)), msg=slugs)
+
     def test_group_tags(self):
         groups = [
             catalog_models.MockTagGroup.objects.create(name=name)